Cryptography
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This document discusses cryptography and its history. Cryptography began as early as 2000 BC in Egypt and has evolved over three eras: the manual era involving pen and paper ciphers, the mechanical era with the invention of cipher machines, and the modern era utilizing computers. Modern cryptography combines computer science and mathematics to encrypt data for security. Key aspects include encryption, decryption, symmetric and asymmetric keys, and different cipher algorithms. The document also covers categories of cryptography, notable cryptographers, applications, and some limitations of early cryptography techniques.
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Cryptography is the practice of securing communication and information by converting plaintext into ciphertext. The document provides an introduction to cryptography including its history from ancient times to the present. It discusses terminology like plaintext, encryption, ciphertext, decryption, and keys. Symmetric key cryptography uses a single key for encryption and decryption while asymmetric key cryptography uses two different keys. Examples of symmetric methods are DES, 3DES, AES, and RC4, while RSA is a common asymmetric method. Applications of cryptography include ATMs, email passwords, e-payments, e-commerce, electronic voting, defense services, securing data, and access control.
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Cryptography involves techniques for securing communication and information. It uses ciphers and encryption algorithms to convert plain text into encrypted ciphertext. There are two main types of encryption: symmetric key encryption which uses a shared secret key for encryption and decryption, and asymmetric (public key) encryption which uses separate public and private keys. Cryptography is used for secure communication over the internet, wireless networks, and to encrypt files and content. Common ciphers include the Caesar cipher which shifts each letter by a fixed number of positions. Ciphers can be attacked using statistical analysis of letter frequencies or brute force methods to decrypt the ciphertext without the key.
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.
Cryptography
Cryptography is the science of securing information and communication through encryption. It has a long history dating back to ancient civilizations, but modern cryptography emerged in the early 20th century with the invention of encryption machines like the Enigma and Lorenz ciphers used in World War II. Cryptography serves purposes like authentication, confidentiality, integrity, and non-repudiation. It uses techniques like symmetric encryption with a shared key, asymmetric encryption with public/private key pairs, and hash functions. Cryptography has many applications in digital signatures, smart cards, e-commerce, passwords, and ATMs. While technology has improved security, perfection has not been achieved.
Chapter_three - Computer Security.pdf
This document provides an introduction and overview of cryptography and encryption techniques. It discusses basic cryptographic terms and the historical background of techniques like the Caesar cipher, Enigma machine, and how computers were used for code breaking during World War II. The document outlines symmetric and public key cryptography, including example algorithms like DES and AES, and covers topics like cryptographic hash functions.
Computer network
Cryptography is a method of protecting information and communications through the use of codes. It involves techniques such as encrypting plaintext into ciphertext using a key, and back again through decryption. Modern cryptography aims for confidentiality, integrity, non-repudiation and authentication of digital information. It uses cryptosystems, keys and algorithms to encrypt and decrypt data between senders and receivers over secure channels.
cryptography presentation this about how cryptography works
Cryptography is the process of encrypting information to hide its meaning and involves techniques like cipher systems that scramble letters and numbers. Different encryption methods have been used throughout history from simple substitution ciphers like the Caesar cipher used by Julius Caesar to modern techniques relying on complex mathematics. Alan Turing helped crack the German Enigma code during World War II by designing the bombe machine to determine the settings of the Enigma rotors and help decrypt messages.
Cryptography
Cryptography is the practice of securing communication through encryption and decryption techniques to transmit information secretly. There are three eras in the history of cryptography: the manual era, mechanical era, and modern era. The main types of cryptography are encryption, which locks up information, and decryption, which unlocks encrypted information. Cryptography uses keys, either symmetric keys where the same key encrypts and decrypts, or public key cryptography which uses two separate keys - a private key and public key.
CRYPTOLOGY
This document provides an overview of cryptology. It defines cryptology as the study of secret writings and notes that modern cryptology combines computer science and mathematics to encode information securely. It explains the basic concepts of encryption, where plaintext is encoded into ciphertext using an encryption key, and decryption, where the ciphertext is decoded back into plaintext using a decryption key. The document also gives an example of a basic letter substitution cipher and discusses cryptography, cryptanalysis, uses of cryptology in securing internet data and ATM transactions, and some limitations around the time required to create and break codes.
What is Cryptography?
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Data Security on Computer Network and Telecommunication System Using Caesar C...
In this era of global communication where online communication through the use of computer network and telecommunication system has dominated the means of communication between people. The goal of privacy is very paramount. The numbers of people being connected to the communication system through their mobile phone, computer or any other e-communication tools are increasing day-by-day. Hence there is need to secure the communication networks from adversaries (third parties) between the sender and receivers. There are many aspects to security approach in data communication environment. One essential aspect for secure communications is that of cryptography, which the focus of this research is. We have developed stand-alone application software that implements cryptography using Caesar algorithms. This program can be implemented with chatting software or E-mail software to encrypt data. The algorithm was coded with Java programming language.
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Cryptology is the study of secret writings and involves encoding information using computer science and mathematics to ensure data security. It involves encryption to encode plaintext into ciphertext using an encryption key, and decryption to decode the ciphertext back into plaintext using a decryption key. Cryptography is the art and science of creating secret codes, while cryptanalysis is the art and science of breaking those codes. Cryptology methods like substitution ciphers are used to securely transmit data over insecure networks like the internet as well as in applications like ATMs and during World War II. However, cryptology also has limitations in that both creating and breaking codes can be long processes.
Ppt ns
Symmetric encryption uses a single, shared key between the sender and receiver to encrypt and decrypt messages. Common symmetric algorithms are DES, 3DES, and AES. The main drawback is securely exchanging the encryption key between parties. Cryptanalysis is the study of decrypting ciphertext without knowing the key, and involves cryptanalytic attacks or brute-force attacks to discover the plaintext or key.
Cryptography, a science of secure writing
Cryptography is the science of secure writing. It allows for authentication of users, privacy, integrity of messages, and non-repudiation through various encryption techniques. The document discusses the history and purposes of cryptography. It outlines modern cryptographic algorithms like secret key cryptography, hash functions, and public key cryptography. Specific algorithms like AES, RSA, and MD5 are also mentioned. The significance of passwords and drawbacks of cryptography are reviewed.
My cryptography
A short ppt on Cryptography . It contains just an abstract idea of Cryptography presented by Me for College
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Cryptography
- 1. SOURASHTRA COLLEGE CRYPTOGRAPHY BY L.S.KARNAN II YEAR B.Sc., Mathematics
- 2. Cryptography is the Study of art and science of keeping messages secure. Some other authors defined the cryptography as “Cryptography is the process of writing using various methods (“ciphers”) to keep messages secret”. Modern Cryptography combines the studies of Computer Science and Mathematics for the purpose of Encoding information to ensure that data is secure. CRYPTOGRAPHY:
- 3. KEYWORDS: • Cryptography • Cryptanalysis • Encryption • Decryption • Symmetric key • Asymmetric key • Algorithm
- 5. HISTORY OF CRYPTOGRAPHY: Cryptography probably began in or around 2000 B.C. in Egypt. There are three eras in the history of Cryptography: ▪ The Manual era ▪ The Mechanical era ▪ The Modern era
- 7. Manual era: Manual era refers to pen and paper Cryptography and dates back to 2000 B.C. E.G. - Scytale, Caesar, Vigenere. Mechanical era: Mechanical era refers to the invention of cipher machines. E.G. - Japanese Red and Purple Machines, German Enigma. Modern era: The Modern era of cryptography refers to computers. There are infinite permutations of cryptography available using computers. E.G. - Lucifer, RSA, ElGamal.
- 8. MODELS: Ancient Cryptex Modern Cryptex Sumerians - Cuneiform writings Skytale
- 11. Encryption: c = Ee(p) Decryption: p = Dd(c) Here p is a block of plaintext, c is a block of ciphertext, E is the encryption function, e is the encryption key, D is the decryption function and d is the decryption key. FORMULA:
- 12. MATHS Encryption NZGSH Decryption MATHS Example: Plain text Cipher textPlain text NZGSH Cipher text
- 13. { A B C D E……………Y Z 26 25 24 23 22…………... 2 1 1 2 3 4 5……………25 26 FORWARD NUMBER FORWARD LETTER BACKWARD NUMBER M - 14 - N vice - versa A - 26 - Z T - 07 - G H - 19 - S S - 08 - H For DecryptionFor Encryption CODING METHOD : F.LB.N
- 17. CRYPTOGRAPHERS: Caesar Leon Battista Alberti Blaise de Vigenere
- 18. CRYPTANALYSERS:
- 19. APPLICATIONS: Privacy/confidentiality Integrity This method is followed in Military This method is used in ATM centers Now-a-days, internet is very insecure therefore Cryptography method is followed to safeguard to transmit data.
- 20. - Takes a long time to figure out the code - It takes long to create the code - If you were to send a code to another person in the past, it will take long to get to that person - OVERALL CRYPTOGRAPHY IT'S A LONG PROCESS. LIMITATIONS: