Lesson 1 presentation
•Download as PPTX, PDF•
0 likes•209 views
This document provides an introduction to cryptography. It discusses how cryptography has its origins in ancient practices like Egyptian hieroglyphics which allowed only some people to understand hidden messages. It then explains Julius Caesar's development of the first modern cipher known as the Caesar cipher, which replaces each character in a message with the character three positions ahead in the alphabet. Finally, it presents an encoded message for the reader to decode using the Caesar cipher as an example of cryptography.
Report
Share
Report
Share
Recommended
Draft 6
This document provides an overview of cryptography and discusses the Enigma cipher machine in detail. It begins with a brief history of cryptography, including early examples from ancient civilizations. It then explains the basic concepts of codes and ciphers, as well as frequency analysis techniques used in cryptanalysis. The document focuses on the development and workings of the Enigma machine, including its rotors, plugboard, and other components. It discusses how Polish, French, and British cryptanalysts were eventually able to decrypt Enigma messages during World War II despite German efforts to strengthen the cipher.
Cryptography
Cryptography is the art of hiding information by converting a message into an unintelligible format. It works by using encryption algorithms and secret keys to encrypt plaintext into ciphertext, and decryption algorithms to convert ciphertext back to plaintext. There are two main types of cryptography: symmetric which uses the same key to encrypt and decrypt, and asymmetric which uses different but mathematically linked public and private keys. Some common cipher techniques include the Caesar cipher which shifts letters by a number of positions, the Hill cipher which uses matrix multiplication, and the Vigenere cipher which applies multiple Caesar ciphers using a keyword. Cryptography helps maintain data confidentiality, integrity and access control.
History of cryptography
The document provides a history of cryptography from ancient times to modern day. It describes early manual encryption techniques used by ancient Greeks and Romans. In the Middle Ages, Arabic scholar Al-Kindi developed frequency analysis to break ciphers. During the Renaissance period, the polyalphabetic cipher was introduced. In World War 1 and 2, mechanical encryption machines like the Enigma and SIGABA were widely used. Modern cryptography began with Claude Shannon's mathematical foundations and the introduction of the Data Encryption Standard (DES) in the 1970s. Public key cryptography was then introduced in the 1970s through Diffie-Hellman key exchange.
CrypTool: Cryptography for the masses
CrypTool is a free software illustrating the cryptographic concepts. It is the world\'s most widespread e-learning software in the area of cryptology. A great number of analysis tools and algorithms are efficiently implemented. The graphical interface and the abundant online documentation allow the user, even a newbie, to be introduced to cryptography mysteries.
A few words in figures
This document discusses John Brown Jr.'s cipher and the process of cracking it. It explains that the cipher uses numbers instead of letters or symbols and is laid out in columns that are read from bottom to top and right to left. Through analyzing patterns in the numbers, such as common letter frequencies, the document outlines how the cipher was decoded. Key discoveries included that "00" represented filler letters, "16" likely represented "e" based on letter frequency, and the numbers descended evenly then ascended oddly corresponding to the alphabet. Once this pattern was found, samples of decoded text, like the word "FIGURES", demonstrated the cipher had been broken.
Encryption-Decryption Challenge: Caesar Cipher - About me!
In this activity, you are going to discover Caesar Cipher that you can use to send secret messages to your friends!
CaesarCipherWorksheet.pdf
This document introduces the Caesar cipher method of encryption and decryption. It defines cryptography, encryption, and decryption. It then explains that the Caesar cipher replaces each letter in plaintext with a letter a fixed number of positions down the alphabet, like replacing each letter with the 3rd next letter. It challenges students to write a paragraph about themselves, encrypt it using the Caesar cipher cycles provided, and upload the encrypted text to try and decrypt messages from other students.
Recommended
Draft 6
This document provides an overview of cryptography and discusses the Enigma cipher machine in detail. It begins with a brief history of cryptography, including early examples from ancient civilizations. It then explains the basic concepts of codes and ciphers, as well as frequency analysis techniques used in cryptanalysis. The document focuses on the development and workings of the Enigma machine, including its rotors, plugboard, and other components. It discusses how Polish, French, and British cryptanalysts were eventually able to decrypt Enigma messages during World War II despite German efforts to strengthen the cipher.
Cryptography
Cryptography is the art of hiding information by converting a message into an unintelligible format. It works by using encryption algorithms and secret keys to encrypt plaintext into ciphertext, and decryption algorithms to convert ciphertext back to plaintext. There are two main types of cryptography: symmetric which uses the same key to encrypt and decrypt, and asymmetric which uses different but mathematically linked public and private keys. Some common cipher techniques include the Caesar cipher which shifts letters by a number of positions, the Hill cipher which uses matrix multiplication, and the Vigenere cipher which applies multiple Caesar ciphers using a keyword. Cryptography helps maintain data confidentiality, integrity and access control.
History of cryptography
The document provides a history of cryptography from ancient times to modern day. It describes early manual encryption techniques used by ancient Greeks and Romans. In the Middle Ages, Arabic scholar Al-Kindi developed frequency analysis to break ciphers. During the Renaissance period, the polyalphabetic cipher was introduced. In World War 1 and 2, mechanical encryption machines like the Enigma and SIGABA were widely used. Modern cryptography began with Claude Shannon's mathematical foundations and the introduction of the Data Encryption Standard (DES) in the 1970s. Public key cryptography was then introduced in the 1970s through Diffie-Hellman key exchange.
CrypTool: Cryptography for the masses
CrypTool is a free software illustrating the cryptographic concepts. It is the world\'s most widespread e-learning software in the area of cryptology. A great number of analysis tools and algorithms are efficiently implemented. The graphical interface and the abundant online documentation allow the user, even a newbie, to be introduced to cryptography mysteries.
A few words in figures
This document discusses John Brown Jr.'s cipher and the process of cracking it. It explains that the cipher uses numbers instead of letters or symbols and is laid out in columns that are read from bottom to top and right to left. Through analyzing patterns in the numbers, such as common letter frequencies, the document outlines how the cipher was decoded. Key discoveries included that "00" represented filler letters, "16" likely represented "e" based on letter frequency, and the numbers descended evenly then ascended oddly corresponding to the alphabet. Once this pattern was found, samples of decoded text, like the word "FIGURES", demonstrated the cipher had been broken.
Encryption-Decryption Challenge: Caesar Cipher - About me!
In this activity, you are going to discover Caesar Cipher that you can use to send secret messages to your friends!
CaesarCipherWorksheet.pdf
This document introduces the Caesar cipher method of encryption and decryption. It defines cryptography, encryption, and decryption. It then explains that the Caesar cipher replaces each letter in plaintext with a letter a fixed number of positions down the alphabet, like replacing each letter with the 3rd next letter. It challenges students to write a paragraph about themselves, encrypt it using the Caesar cipher cycles provided, and upload the encrypted text to try and decrypt messages from other students.
Cryptograph yreport 2003
Cryptography uses mathematical techniques to encrypt and decrypt messages so they can only be read by the intended recipient. The document discusses the history of cryptography including techniques like the Caesar cipher and transposition ciphers. It also explains different types of cryptography including secret key cryptography, public key cryptography, and hash function cryptography. Key types like private keys, public keys, and symmetric keys are also defined.
Cryptography
Cryptography is the practice and study of hiding information. It has its origins as far back as 2000 BC in Egypt with hieroglyphics. Throughout history, different cultures developed ciphers and codes for encryption, including the ancient Chinese, Mesopotamians, Spartans, and during wars. Modern cryptography involves encryption, decryption using keys, and can be symmetric (same key) or asymmetric (public/private keys) like RSA encryption. Cryptography has many applications including online security, digital signatures, and encryption on devices like smart cards.
Information Security Cryptography ( L03- Old Cryptography Algorithms )
This document discusses old encryption algorithms from the classical method of cryptography, including replacement algorithms, the Caesar cipher, Vigenere cipher, Atbash cipher, and Affine cipher. It also describes the Jefferson cylinder, one of the strongest encryption devices of the time which was nearly unbreakable without stealing the entire device.
4.Cryptography handout 2.pptx
Cryptography is the study of techniques for securing communication and information. The document provides an introduction to cryptography, including definitions of encryption, decryption, plaintext and ciphertext. It discusses classical ciphers like the Caesar cipher, monoalphabetic and polyalphabetic ciphers, the Playfair cipher, Vigenère cipher and the one-time pad cipher. It also covers cryptanalysis techniques and introduces concepts in modern cryptography like symmetric and asymmetric key cryptography.
Ccn presentation
Cryptography is the practice of hiding information by converting intelligible data into unintelligible ciphertext, and back again. It provides confidentiality, integrity, and authentication. There are three eras of cryptography - manual using pen and paper, mechanical using cipher machines, and modern using computers. Encryption is converting plaintext to ciphertext while decryption is converting ciphertext back to plaintext. Symmetric cryptography uses a single shared key for encryption and decryption, while asymmetric cryptography uses public and private key pairs.
Human being from ages had 2 inherent wants (a) to speak and share d.pdf
Human being from ages had 2 inherent wants (a) to speak and share data and (b) to speak by
selection. These 2 wants gave rise to the art of committal to writing the messages in such how
that solely the supposed individuals might have access to the knowledge. Unauthorized
individuals couldn\'t extract any data, notwithstanding the disorganised messages fell in their
hand.
The art and science of concealing the messages to introduce secrecy in data security is
recognized as cryptography.
The word ‘cryptography’ was coined by combining 2 Greek words, ‘Krypto’ which means
hidden and ‘graphene’ which means writing.
History of Cryptography
The art of cryptography is taken into account to change state at the side of the art of writing. As
civilizations evolved, folks got organized in tribes, groups, and kingdoms. This LED to the
emergence of ideas like power, battles, supremacy, and politics. These ideas any burning the
natural would like of individuals to speak on the Q.T. with selective recipient that successively
ensured the continual evolution of cryptography likewise.
The roots of cryptography square measure found in Roman and Egyptian civilizations.
Hieroglyph The Oldest cryptographical Technique
The first glorious proof of cryptography will be copied to the utilization of ‘hieroglyph’. Some
4000 years agone, the Egyptians accustomed communicate by messages written in hieroglyph.
This code was the key glorious solely to the scribes WHO accustomed transmit messages on
behalf of the kings. One such hieroglyph is shown below.
Hieroglyph
Later, the students affected on to exploitation easy mono-alphabetic substitution ciphers
throughout five hundred to 600 BC. This concerned replacement alphabets of message with
alternative alphabets with some secret rule. This rule became a key to retrieve the message back
from the disconnected message.
The earlier Roman methodology of cryptography, popularly called the Caesar Shift Cipher,
depends on shifting the letters of a message by AN united range (three was a typical choice), the
recipient of this message would then shift the letters back by constant range and procure the first
message.
Caesar Shift Cipher
Steganography
Steganography is comparable however adds another dimension to Cryptography. during this
methodology, individuals not solely wish to shield the secrecy of AN data by concealing it,
however they conjointly wish to create certain any unauthorized person gets no proof that the
knowledge even exists. for instance, invisible watermarking.
In steganography, AN unmotivated recipient or AN trespasser is unaware of the actual fact that
determined knowledge contains hidden data. In cryptography, AN trespasser is generally aware
that knowledge is being communicated, as a result of they\'ll see the coded/scrambled message.
Solution
Human being from ages had 2 inherent wants (a) to speak and share data and (b) to speak by
selection. These 2 wants gave rise to the art of committal to writing the messages i.
Presentation for cryptography session 01 v1
Cryptography makes the world tick securely! Cryptography drives economies, armies, freedom, and BLOCKCHAIN. Learn the foundation of cryptography as Mark takes you on a tour of secret making, keeping, and sharing. Leave understanding the purpose and function of basic cryptography and how it has evolved over centuries and today is once again evolving to new challenges. Learn the future of cryptography and how cryptography is utilized in blockchain technologies like Bitcoin, Ethereum, and Hyperledger. Learn about encryption, hashing, keys, signatures, and more.
This is the first session of three. This first session is on fundamentals of cryptography. Its purpose is to provide basic understanding of cryptography. Session two will delve into application of cryptography by presenting the utilization of cryptography in the leading blockchain platforms. The final session will present on the future of cryptography focusing on quantum technology and side-channeling AI, something only Mark and perhaps a hand full of researchers and inventors are working on--until the word spreads and others get in the race.
The presenter and creator of these sessions is Mark Morris, the CEO and CTO of Tarantula Technology, an Austin technology think tank, consulting and software development firm specializing in blockchain, AR, AI, and security integration and solutions for enterprise and government.
Cryptography 387 © David Lippman Creative Commons BY-.docx
This document discusses cryptography techniques including substitution ciphers, transposition ciphers, and advanced symmetric key methods. It provides examples of encrypting and decrypting messages using a Caesar cipher with shifting substitutions, a transposition cipher that writes messages in rows and reads them out in columns according to a keyword, and a simplified polyalphabetic cipher that shifts the substitution after each character. Frequency analysis and brute force attacks are also discussed as techniques for breaking simple ciphers.
Cryptography
Cryptography involves encrypting information to ensure confidentiality, integrity, authentication and non-repudiation. The document discusses the history of cryptography from ancient methods like the Spartan Scytale to modern techniques like the RSA algorithm. It outlines ciphers like the Caesar cipher and Vigenere cipher, explaining how they work and can be broken through frequency analysis and determining the keyword length. The origins and workings of public key cryptography using prime number factorization with RSA is presented. Current cryptography is discussed with examples of its applications and the ongoing need to increase key lengths due to brute force attacks.
Introductory Lecture on Cryptography and Information Security
This document discusses cryptography and the Caesar cipher. It begins by defining cryptography as the encoding of messages to achieve secure communication and outlines its goals of confidentiality, integrity, and availability. The document then describes the Caesar cipher technique, in which each letter is shifted a fixed number of positions in the alphabet. It provides an example of encrypting a message with a shift of 11. The document explains that the Caesar cipher is vulnerable to brute force and statistical cryptanalysis due to its small key space and predictable letter frequencies. It concludes that more advanced algorithms are needed for secure encryption in the digital age.
Cryptography with caesar Cipher
This document provides information about the Caesar cipher encryption technique. It begins with an introduction to cryptography and discusses why encryption is needed for secure communication. It then explains the Caesar cipher specifically, which is one of the earliest and simplest substitution ciphers. It works by shifting each letter in the plaintext message by a set number of places in the alphabet, using a key. An example is provided to demonstrate the encryption and decryption process using the Caesar cipher.
Ijcta2011020338
This document provides an overview and comparison of cryptography and steganography. Cryptography scrambles a message to make it unreadable, while steganography hides the message to make its very presence undetectable. Both techniques can be combined to enhance security. Cryptography has a long history dating back thousands of years, while steganography originated in ancient Greece. Modern techniques include public/private key cryptography, digital signatures, hash functions, and hiding messages in digital files like images, audio and video. The key difference is that cryptography fails if an enemy detects an encrypted message, while steganography fails if they detect the hidden message. Combining the two provides multiple layers of security.
Cryptography
Cryptography is the practice of securing communications and information by converting it into an unintelligible form called cipher text. Some key developments in cryptography include ancient methods like the Caesar cipher, the rise of cipher machines in World War 2 like the Enigma, the development of computerized cryptography with algorithms like DES and AES, and modern uses of public key cryptography and biometrics. Throughout its history, cryptography has evolved from a focus on simple substitution ciphers to the sophisticated mathematical algorithms used today to securely transmit information.
Cryptography
The document discusses cryptography concepts including encryption, decryption, symmetric and asymmetric encryption techniques, cryptanalysis methods like brute force attacks, and the importance of secret keys. Symmetric encryption uses a shared secret key by both sender and receiver, while asymmetric encryption uses different public/private keys. Cryptanalysis aims to discover plaintext or keys by techniques like brute force trials or exploiting algorithm weaknesses. Longer cryptographic keys increase the difficulty of brute force attacks breaking the encryption.
Cryptography
Cryptography involves secret writing and encrypting messages so that only authorized parties can read them. It uses algorithms and keys to encrypt plaintext into ciphertext. Cryptanalysis involves breaking ciphers, while cryptography is designing ciphers. Cryptology encompasses both cryptography and cryptanalysis. Common encryption models involve plaintext being encrypted into ciphertext using a key, which is then transmitted and decrypted by the intended receiver using the same key.
Primary Task ResponseJulius Caesar used one of the earliest .docx
Primary Task Response:
Julius Caesar used one of the earliest known cipher systems to communicate with Cicero in Rome while he was conquering Europe. Caesar knew that there was a very high risk of ambush or spies when sending messages; therefore, he developed a cryptographic system now known as the Caesar cipher. Please provide a detailed response to the below to include specific details and examples.
What is the Caesar ROT3 Cipher?
How does it work?
Although the Caesar cipher is easy to use, it is easy to crack. How would an attacker break a Caesar-style cipher?
Try your hand!
1. Encrypt the below message using the Caesar ROT3 cipher.
I WILL BECOME A CRYPTOGRAPHIC GURU
2. Decrypt the below message using the Caesar ROT3 cipher.
FRQJUDWXODWLRQVBRXJRWLW
3. Create a cipher of your own and see who can crack it! Toward the end of the week, provide the solution to your cipher.
Peer Response(s):
Read the responses from your peers, attempt to crack the cipher codes presented, and offer a constructive critique or additional information that adds substantively to the discussions. Be sure to acknowledge any outside sources you use.
...
Primary Task ResponseJulius Caesar used one of the earliest kno.docx
Primary Task Response:
Julius Caesar used one of the earliest known cipher systems to communicate with Cicero in Rome while he was conquering Europe. Caesar knew that there was a very high risk of ambush or spies when sending messages; therefore, he developed a cryptographic system now known as the Caesar cipher. Please provide a detailed response to the below to include specific details and examples.
What is the Caesar ROT3 Cipher?
How does it work?
Although the Caesar cipher is easy to use, it is easy to crack. How would an attacker break a Caesar-style cipher?
Try your hand!
1. Encrypt the below message using the Caesar ROT3 cipher.
I WILL BECOME A CRYPTOGRAPHIC GURU
2. Decrypt the below message using the Caesar ROT3 cipher.
FRQJUDWXODWLRQVBRXJRWLW
3. Create a cipher of your own and see who can crack it! Toward the end of the week, provide the solution to your cipher.
Peer Response(s):
Read the responses from your peers, attempt to crack the cipher codes presented, and offer a constructive critique or additional information that adds substantively to the discussions. Be sure to acknowledge any outside sources you use.
...
SubstitutionAndCaesar
This document discusses various methods of substitution ciphers, beginning with the Caesar cipher. It explores more complex ciphers like the Vigenère cipher and the Playfair cipher. It also covers modern unbreakable ciphers like the one-time pad. In summary, substitution ciphers have evolved over time to provide greater security by incorporating words, symbols, and random keys.
Ch02...1
The document summarizes classical encryption techniques, including:
- Symmetric encryption uses a shared key between sender and receiver for encryption/decryption.
- Early techniques included the Caesar cipher (shifting letters), monoalphabetic cipher (mapping each letter to another), and Playfair cipher (encrypting letter pairs).
- The Vigenère cipher improved security by using a keyword to select different Caesar ciphers for successive letters, making it a polyalphabetic cipher.
More Related Content
Similar to Lesson 1 presentation
Cryptograph yreport 2003
Cryptography uses mathematical techniques to encrypt and decrypt messages so they can only be read by the intended recipient. The document discusses the history of cryptography including techniques like the Caesar cipher and transposition ciphers. It also explains different types of cryptography including secret key cryptography, public key cryptography, and hash function cryptography. Key types like private keys, public keys, and symmetric keys are also defined.
Cryptography
Cryptography is the practice and study of hiding information. It has its origins as far back as 2000 BC in Egypt with hieroglyphics. Throughout history, different cultures developed ciphers and codes for encryption, including the ancient Chinese, Mesopotamians, Spartans, and during wars. Modern cryptography involves encryption, decryption using keys, and can be symmetric (same key) or asymmetric (public/private keys) like RSA encryption. Cryptography has many applications including online security, digital signatures, and encryption on devices like smart cards.
Information Security Cryptography ( L03- Old Cryptography Algorithms )
This document discusses old encryption algorithms from the classical method of cryptography, including replacement algorithms, the Caesar cipher, Vigenere cipher, Atbash cipher, and Affine cipher. It also describes the Jefferson cylinder, one of the strongest encryption devices of the time which was nearly unbreakable without stealing the entire device.
4.Cryptography handout 2.pptx
Cryptography is the study of techniques for securing communication and information. The document provides an introduction to cryptography, including definitions of encryption, decryption, plaintext and ciphertext. It discusses classical ciphers like the Caesar cipher, monoalphabetic and polyalphabetic ciphers, the Playfair cipher, Vigenère cipher and the one-time pad cipher. It also covers cryptanalysis techniques and introduces concepts in modern cryptography like symmetric and asymmetric key cryptography.
Ccn presentation
Cryptography is the practice of hiding information by converting intelligible data into unintelligible ciphertext, and back again. It provides confidentiality, integrity, and authentication. There are three eras of cryptography - manual using pen and paper, mechanical using cipher machines, and modern using computers. Encryption is converting plaintext to ciphertext while decryption is converting ciphertext back to plaintext. Symmetric cryptography uses a single shared key for encryption and decryption, while asymmetric cryptography uses public and private key pairs.
Human being from ages had 2 inherent wants (a) to speak and share d.pdf
Human being from ages had 2 inherent wants (a) to speak and share data and (b) to speak by
selection. These 2 wants gave rise to the art of committal to writing the messages in such how
that solely the supposed individuals might have access to the knowledge. Unauthorized
individuals couldn\'t extract any data, notwithstanding the disorganised messages fell in their
hand.
The art and science of concealing the messages to introduce secrecy in data security is
recognized as cryptography.
The word ‘cryptography’ was coined by combining 2 Greek words, ‘Krypto’ which means
hidden and ‘graphene’ which means writing.
History of Cryptography
The art of cryptography is taken into account to change state at the side of the art of writing. As
civilizations evolved, folks got organized in tribes, groups, and kingdoms. This LED to the
emergence of ideas like power, battles, supremacy, and politics. These ideas any burning the
natural would like of individuals to speak on the Q.T. with selective recipient that successively
ensured the continual evolution of cryptography likewise.
The roots of cryptography square measure found in Roman and Egyptian civilizations.
Hieroglyph The Oldest cryptographical Technique
The first glorious proof of cryptography will be copied to the utilization of ‘hieroglyph’. Some
4000 years agone, the Egyptians accustomed communicate by messages written in hieroglyph.
This code was the key glorious solely to the scribes WHO accustomed transmit messages on
behalf of the kings. One such hieroglyph is shown below.
Hieroglyph
Later, the students affected on to exploitation easy mono-alphabetic substitution ciphers
throughout five hundred to 600 BC. This concerned replacement alphabets of message with
alternative alphabets with some secret rule. This rule became a key to retrieve the message back
from the disconnected message.
The earlier Roman methodology of cryptography, popularly called the Caesar Shift Cipher,
depends on shifting the letters of a message by AN united range (three was a typical choice), the
recipient of this message would then shift the letters back by constant range and procure the first
message.
Caesar Shift Cipher
Steganography
Steganography is comparable however adds another dimension to Cryptography. during this
methodology, individuals not solely wish to shield the secrecy of AN data by concealing it,
however they conjointly wish to create certain any unauthorized person gets no proof that the
knowledge even exists. for instance, invisible watermarking.
In steganography, AN unmotivated recipient or AN trespasser is unaware of the actual fact that
determined knowledge contains hidden data. In cryptography, AN trespasser is generally aware
that knowledge is being communicated, as a result of they\'ll see the coded/scrambled message.
Solution
Human being from ages had 2 inherent wants (a) to speak and share data and (b) to speak by
selection. These 2 wants gave rise to the art of committal to writing the messages i.
Presentation for cryptography session 01 v1
Cryptography makes the world tick securely! Cryptography drives economies, armies, freedom, and BLOCKCHAIN. Learn the foundation of cryptography as Mark takes you on a tour of secret making, keeping, and sharing. Leave understanding the purpose and function of basic cryptography and how it has evolved over centuries and today is once again evolving to new challenges. Learn the future of cryptography and how cryptography is utilized in blockchain technologies like Bitcoin, Ethereum, and Hyperledger. Learn about encryption, hashing, keys, signatures, and more.
This is the first session of three. This first session is on fundamentals of cryptography. Its purpose is to provide basic understanding of cryptography. Session two will delve into application of cryptography by presenting the utilization of cryptography in the leading blockchain platforms. The final session will present on the future of cryptography focusing on quantum technology and side-channeling AI, something only Mark and perhaps a hand full of researchers and inventors are working on--until the word spreads and others get in the race.
The presenter and creator of these sessions is Mark Morris, the CEO and CTO of Tarantula Technology, an Austin technology think tank, consulting and software development firm specializing in blockchain, AR, AI, and security integration and solutions for enterprise and government.
Cryptography 387 © David Lippman Creative Commons BY-.docx
This document discusses cryptography techniques including substitution ciphers, transposition ciphers, and advanced symmetric key methods. It provides examples of encrypting and decrypting messages using a Caesar cipher with shifting substitutions, a transposition cipher that writes messages in rows and reads them out in columns according to a keyword, and a simplified polyalphabetic cipher that shifts the substitution after each character. Frequency analysis and brute force attacks are also discussed as techniques for breaking simple ciphers.
Cryptography
Cryptography involves encrypting information to ensure confidentiality, integrity, authentication and non-repudiation. The document discusses the history of cryptography from ancient methods like the Spartan Scytale to modern techniques like the RSA algorithm. It outlines ciphers like the Caesar cipher and Vigenere cipher, explaining how they work and can be broken through frequency analysis and determining the keyword length. The origins and workings of public key cryptography using prime number factorization with RSA is presented. Current cryptography is discussed with examples of its applications and the ongoing need to increase key lengths due to brute force attacks.
Introductory Lecture on Cryptography and Information Security
This document discusses cryptography and the Caesar cipher. It begins by defining cryptography as the encoding of messages to achieve secure communication and outlines its goals of confidentiality, integrity, and availability. The document then describes the Caesar cipher technique, in which each letter is shifted a fixed number of positions in the alphabet. It provides an example of encrypting a message with a shift of 11. The document explains that the Caesar cipher is vulnerable to brute force and statistical cryptanalysis due to its small key space and predictable letter frequencies. It concludes that more advanced algorithms are needed for secure encryption in the digital age.
Cryptography with caesar Cipher
This document provides information about the Caesar cipher encryption technique. It begins with an introduction to cryptography and discusses why encryption is needed for secure communication. It then explains the Caesar cipher specifically, which is one of the earliest and simplest substitution ciphers. It works by shifting each letter in the plaintext message by a set number of places in the alphabet, using a key. An example is provided to demonstrate the encryption and decryption process using the Caesar cipher.
Ijcta2011020338
This document provides an overview and comparison of cryptography and steganography. Cryptography scrambles a message to make it unreadable, while steganography hides the message to make its very presence undetectable. Both techniques can be combined to enhance security. Cryptography has a long history dating back thousands of years, while steganography originated in ancient Greece. Modern techniques include public/private key cryptography, digital signatures, hash functions, and hiding messages in digital files like images, audio and video. The key difference is that cryptography fails if an enemy detects an encrypted message, while steganography fails if they detect the hidden message. Combining the two provides multiple layers of security.
Cryptography
Cryptography is the practice of securing communications and information by converting it into an unintelligible form called cipher text. Some key developments in cryptography include ancient methods like the Caesar cipher, the rise of cipher machines in World War 2 like the Enigma, the development of computerized cryptography with algorithms like DES and AES, and modern uses of public key cryptography and biometrics. Throughout its history, cryptography has evolved from a focus on simple substitution ciphers to the sophisticated mathematical algorithms used today to securely transmit information.
Cryptography
The document discusses cryptography concepts including encryption, decryption, symmetric and asymmetric encryption techniques, cryptanalysis methods like brute force attacks, and the importance of secret keys. Symmetric encryption uses a shared secret key by both sender and receiver, while asymmetric encryption uses different public/private keys. Cryptanalysis aims to discover plaintext or keys by techniques like brute force trials or exploiting algorithm weaknesses. Longer cryptographic keys increase the difficulty of brute force attacks breaking the encryption.
Cryptography
Cryptography involves secret writing and encrypting messages so that only authorized parties can read them. It uses algorithms and keys to encrypt plaintext into ciphertext. Cryptanalysis involves breaking ciphers, while cryptography is designing ciphers. Cryptology encompasses both cryptography and cryptanalysis. Common encryption models involve plaintext being encrypted into ciphertext using a key, which is then transmitted and decrypted by the intended receiver using the same key.
Primary Task ResponseJulius Caesar used one of the earliest .docx
Primary Task Response:
Julius Caesar used one of the earliest known cipher systems to communicate with Cicero in Rome while he was conquering Europe. Caesar knew that there was a very high risk of ambush or spies when sending messages; therefore, he developed a cryptographic system now known as the Caesar cipher. Please provide a detailed response to the below to include specific details and examples.
What is the Caesar ROT3 Cipher?
How does it work?
Although the Caesar cipher is easy to use, it is easy to crack. How would an attacker break a Caesar-style cipher?
Try your hand!
1. Encrypt the below message using the Caesar ROT3 cipher.
I WILL BECOME A CRYPTOGRAPHIC GURU
2. Decrypt the below message using the Caesar ROT3 cipher.
FRQJUDWXODWLRQVBRXJRWLW
3. Create a cipher of your own and see who can crack it! Toward the end of the week, provide the solution to your cipher.
Peer Response(s):
Read the responses from your peers, attempt to crack the cipher codes presented, and offer a constructive critique or additional information that adds substantively to the discussions. Be sure to acknowledge any outside sources you use.
...
Primary Task ResponseJulius Caesar used one of the earliest kno.docx
Primary Task Response:
Julius Caesar used one of the earliest known cipher systems to communicate with Cicero in Rome while he was conquering Europe. Caesar knew that there was a very high risk of ambush or spies when sending messages; therefore, he developed a cryptographic system now known as the Caesar cipher. Please provide a detailed response to the below to include specific details and examples.
What is the Caesar ROT3 Cipher?
How does it work?
Although the Caesar cipher is easy to use, it is easy to crack. How would an attacker break a Caesar-style cipher?
Try your hand!
1. Encrypt the below message using the Caesar ROT3 cipher.
I WILL BECOME A CRYPTOGRAPHIC GURU
2. Decrypt the below message using the Caesar ROT3 cipher.
FRQJUDWXODWLRQVBRXJRWLW
3. Create a cipher of your own and see who can crack it! Toward the end of the week, provide the solution to your cipher.
Peer Response(s):
Read the responses from your peers, attempt to crack the cipher codes presented, and offer a constructive critique or additional information that adds substantively to the discussions. Be sure to acknowledge any outside sources you use.
...
SubstitutionAndCaesar
This document discusses various methods of substitution ciphers, beginning with the Caesar cipher. It explores more complex ciphers like the Vigenère cipher and the Playfair cipher. It also covers modern unbreakable ciphers like the one-time pad. In summary, substitution ciphers have evolved over time to provide greater security by incorporating words, symbols, and random keys.
Ch02...1
The document summarizes classical encryption techniques, including:
- Symmetric encryption uses a shared key between sender and receiver for encryption/decryption.
- Early techniques included the Caesar cipher (shifting letters), monoalphabetic cipher (mapping each letter to another), and Playfair cipher (encrypting letter pairs).
- The Vigenère cipher improved security by using a keyword to select different Caesar ciphers for successive letters, making it a polyalphabetic cipher.
Similar to Lesson 1 presentation (19)
Information Security Cryptography ( L03- Old Cryptography Algorithms )
Information Security Cryptography ( L03- Old Cryptography Algorithms )
Human being from ages had 2 inherent wants (a) to speak and share d.pdf
Human being from ages had 2 inherent wants (a) to speak and share d.pdf
Cryptography 387 © David Lippman Creative Commons BY-.docx
Cryptography 387 © David Lippman Creative Commons BY-.docx
Introductory Lecture on Cryptography and Information Security
Introductory Lecture on Cryptography and Information Security
Primary Task ResponseJulius Caesar used one of the earliest .docx
Primary Task ResponseJulius Caesar used one of the earliest .docx
Primary Task ResponseJulius Caesar used one of the earliest kno.docx
Primary Task ResponseJulius Caesar used one of the earliest kno.docx
Lesson 1 presentation
- 1. An introduction to cryptography
- 2. Cryptography Cryptography comes from the Greek word ‘Kyrptos’. Kyrptos means hidden message
- 3. Cryptography is thought to go back as far a Egyptians and their use of hieroglyphics. Cryptography
- 4. Hieroglyphics were complex pictures that were used in the same way we use the alphabet, to tell things. At the time, only a few people could understand hieroglyphics. Cryptography
- 5. Do you know what this message means? Cryptography
- 6. You will only be able to understand this message if you had the code to unlock or decipher it. Cryptography
- 7. Now using the key, see if you can decipher the message. What does it say? Cryptography
- 8. Julius Caesar developed the first modern cipher. It is known as the ‘Caesar cipher’. Cryptography
- 9. On the ‘Caesar cipher’ each character in a message is replaced with the character three positions ahead of it in the alphabet. Cryptography
- 10. Can you work these out? Cryptography A B C G M Z D E _ _ _ _
- 11. Check you answers: Cryptography
- 12. Cryptography Can you decode the following message? ZXBPXO ZFSEBO - ZOVMWLDOXMEV
- 13. Cryptography The Message said: Caesar Cipher- Cryptography