The document discusses various topics in network security and cryptography. It begins by introducing cryptography and its basic concepts, including encryption, decryption, ciphers, and cryptosystems. It then discusses the goals of cryptography in providing confidentiality, integrity, authentication, and non-repudiation. The document outlines the main types of cryptography: symmetric key cryptography using a shared private key, asymmetric key cryptography using public/private key pairs, and hash functions which generate unique fingerprints of data. Examples of algorithms for each type are also provided.
Cryptography is the science of using mathematics to encrypt and decrypt data.
Cryptography enables you to store sensitive information or transmit it across insecure networks so that it cannot be read by anyone except the intended recipient.
Cryptography is the science of using mathematics to encrypt and decrypt data.
Cryptography enables you to store sensitive information or transmit it across insecure networks so that it cannot be read by anyone except the intended recipient.
A Study of Different Partitioning Clustering Techniqueijsrd.com
In the field of software, Data mining is very useful to identify the interesting patterns and trends from the large amount of stored data into different database and data repository. Clustering technique is basically used to extract the unknown pattern from the large set of data for electronic stored data, business and real time applications. Clustering is a division of data into different groups. Data are grouped into clusters with high intra group similarity and low inter group similarity [2]. Clustering is an unsupervised learning technique. Clustering is useful technique that applied into many areas like marketing studies, DNA analysis, text mining and web documents classification. In the large database, the clustering task is very complex with many attributes. There are many methods to deal with these problems. In this paper we discuss about the different Partitioning Based Methods like- K-Means, K-Medoids and Fuzzy K-Means and compare the advantages or disadvantages over these techniques.
This document covered different topics like Cryptography and its methods; Cryptography used in computing, SET and VPN; Windows Authentication and Kerebros protocol. The content in the document was written as per my knowledge.
A Study of Different Partitioning Clustering Techniqueijsrd.com
In the field of software, Data mining is very useful to identify the interesting patterns and trends from the large amount of stored data into different database and data repository. Clustering technique is basically used to extract the unknown pattern from the large set of data for electronic stored data, business and real time applications. Clustering is a division of data into different groups. Data are grouped into clusters with high intra group similarity and low inter group similarity [2]. Clustering is an unsupervised learning technique. Clustering is useful technique that applied into many areas like marketing studies, DNA analysis, text mining and web documents classification. In the large database, the clustering task is very complex with many attributes. There are many methods to deal with these problems. In this paper we discuss about the different Partitioning Based Methods like- K-Means, K-Medoids and Fuzzy K-Means and compare the advantages or disadvantages over these techniques.
This document covered different topics like Cryptography and its methods; Cryptography used in computing, SET and VPN; Windows Authentication and Kerebros protocol. The content in the document was written as per my knowledge.
A NEW PROPOSED SYMMETRIC KEY ALGORITHM FOR MODERN CRYPTOGRAPHICijsrd.com
Communication in any language between two or more persons is like a plaintext or simple text. That means any person knowing that language can easily understand this plain text until this plaintext is codified in some manner. So, it is important to implement the coding techniques to ensure that information is hidden from everyone for whom it is not intended. So, that only authenticated person will be allowed to access the information. Cryptography is the art and science of achieving security by the encoding of messages in an unreadable form. Cryptography derives from the Greek word; the word "crypto" comes from kruptos, which means "hidden" and graphy means "writing". Thus, Cryptography is the practice and study of the hiding messages. Today, the cryptography is considered as branch for both the Computer Science and mathematics, which will related to the information theory.
METHODS TOWARD ENHANCING RSA ALGORITHM : A SURVEYIJNSA Journal
Cryptography defines different methods and technologies used in ensuring communication between two parties over any communication medium is secure, especially in presence of a third part. This is achieved through the use of several methods, such as encryption, decryption, signing, generating of pseudo-random numbers, among many others. Cryptography uses a key, or some sort of a password to either encrypt or decrypt a message that needs to be kept secret. This is made possible using two classes of key-based encryption and decryption algorithms, namely symmetric and asymmetric algorithms. The best known and the most widely used public key system is RSA. This algorithm comprises of three phases, which are the key generation phase, encryption phase, and the decryption phase. Owing to the advancement in computing technology, RSA is prone to some security risks, which makes it less secure. The following paper preview different proposals on different methods used to enhance the RSA algorithm and increase its security. Some of these enhancements include combining the RSA algorithm with Diffie-Hellman or ElGamal algorithm, modification of RSA to include three or four prime numbers, offline storage of generated keys, a secured algorithm for RSA where the message can be encrypted using dual encryption keys, etc.
Cryptography is technique of securing information and communications through use of codes so that only those person for whom the information is intended can understand it and process it. Thus preventing unauthorized access to information. The prefix “crypt” means “hidden” and suffix graphy means “writing”.
created by,
Nitish V
The presentation covers the following:
Basic Terms
Cryptography
The General Goals of Cryptography
Common Types of Attacks
Substitution Ciphers
Transposition Cipher
Steganography- “Concealed Writing”
Symmetric Secret Key Encryption
Types of Symmetric Algorithms
Common Symmetric Algorithms
Asymmetric Secret Key Encryption
Common Asymmetric Algorithms
Public Key Cryptography
Hashing Techniques
Hashing Algorithms
Digital Signatures
Transport Layer Security
Public key infrastructure (PKI)
This presentation will show you the basics of cryptography.
Main topics like basic terminology,goals of cryptography,threats,types of cryptography,algorithms of cryptography,etc. are covered in this presentation.If you like this presentation please do hit the like.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
2. • To be understand the basic concepts of cryptography
• The student will be able hide the message using cryptography
techniques
3. Steganography is the art and science of writing hidden
messages in such a way that no-one apart from the sender and
intended recipient even realizes there is a hidden message, a
form of security through obscurity
5. Cryptography is the study of secure communications
techniques that allow only the sender and intended recipient of
a message to view its contents. The term is derived from the
Greek word kryptos, which means hidden. It is closely
associated to encryption, which is the act of scrambling
ordinary text into what's known as ciphertext and then back
again upon arrival
6. Cryptography is the science of using mathematics to encrypt
and decrypt data (Phil Zimmermann)
Cryptography is the art and science of keeping messages
secure (Bruce Schneier)
7. Basic Terminologies
A message is plaintext (sometimes called cleartext). The process of
disguising a message in such a way as to hide its substance is encryption.
An encrypted message is ciphertext. The process of turning ciphertext
back into plaintext is decryption.
A cipher (or cypher) is an algorithm for performing encryption or
decryption
8. Basic Terminologies (Cont’d)
A cryptosystem is an implementation of cryptographic techniques and
their accompanying infrastructure to provide information security
services. A cryptosystem is also referred to as a cipher system. The
various components of a basic cryptosystem are as follows −
Plaintext
Encryption Algorithm
Ciphertext
Decryption Algorithm
Encryption Key
Decryption Key
9. Basic Terminologies (Cont’d)
While cryptography is the science of securing data, cryptanalysis
is the science of analyzing and breaking secure communication.
Classical cryptanalysis involves an interesting combination of
analytical reasoning, application of mathematical tools, pattern
finding, patience, determination, and luck. Cryptanalysts are also
called attackers.
Cryptology embraces both cryptography and cryptanalysis.
10. Classical Cryptography
Hieroglyph
The first known evidence of cryptography can be traced to the use of
‘hieroglyph’. Some 4000 years ago, the Egyptians used to
communicate by messages written in hieroglyph.
11. Classical Cryptography (Cont’d)
Caesar Shift Cipher
Caesar Shift Cipher, relies on shifting the letters of a message by
an agreed number (three was a common choice), the recipient of
this message would then shift the letters back by the same
number and obtain the original message.
The Caesar cipher is named after Julius Caesar ,
who used it with a shift of three to protect
messages of military significance.
12. Caesar Shift Cipher
Caesar Shift Cipher Key = 3
PLAINTEXT : internet society ghana chapter
CYPHERTEXT : lqwhuqhw vrflhwb jkdqd fkdswhu
13. Goal and Service Cryptography
Goal: The primary goal of cryptography is to secure important data
on the hard disk or as it passes through a medium that may not be
secure itself. Usually, that medium is a computer network.
Services: Cryptography can provide the following services:
Confidentiality (secrecy)
Integrity (anti-tampering)
Authentication
Non-repudiation.
14. Service Cryptography
Confidentiality (secrecy)
Ensuring that no one can read the message except the intended
receiver
Data is kept secret from those without the proper credentials, even
if that data travels through an insecure medium
Integrity (anti-tampering)
Assuring the receiver that the received message has not
been altered in any way from the original.
15. Service Cryptography
Authentication
Cryptography can help establish identity for authentication
purposes. The process of proving one's identity. (The primary
forms of host-to-host authentication on the Internet today are
name-based or address-based, both of which are notoriously
weak.)
Non-repudiation
A mechanism to prove that the sender
really sent this message
17. Symmetric Key Cryptography
Also known as Secret Key Cryptography or Conventional
Cryptography, Symmetric Key Cryptography is an encryption system
in which the sender and receiver of a message share a single,
common key that is used to encrypt and decrypt the message.
The Algorithm use is also known as a secret key algorithm or
sometimes called a symmetric algorithm
A key is a piece of information (a parameter)
that determines the functional output of a
cryptographic algorithm or cipher.
The key for encrypting and decrypting the file had to be known to all the recipients. Else,
the message could not be decrypted by conventional means.
18. Symmetric Key Cryptography - Examples
Permutation Cipher
substitution cipher,
Hill Cipher,
Rijndael (AES),
Blowfish,
DES
3DES
IDEA
etc ....
19. Problem Symmetric Key Cryptography
Key Management
Symmetric-key systems are simpler and faster; their main drawback
is that the two parties must somehow exchange the key in a secure
way and keep it secure after that.
Key Management caused nightmare for the parties using the
symmetric key cryptography. They were worried about how to get the
keys safely and securely across to all users so that the decryption of
the message would be possible. This gave the chance for third
parties to intercept the keys in transit to decode the top-secret
messages. Thus, if the key was compromised, the entire coding
system was compromised and a “Secret” would no longer remain a
“Secret”.
This is why the “Public Key Cryptography” came into existence.
20. Asymmetric Key Cryptography
Asymmetric cryptography , also known as Public-key cryptography,
refers to a cryptographic algorithm which requires two separate keys,
one of which is private and one of which is public. The public key is
used to encrypt the message and the private one is used to decrypt
the message.
22. Asymmetric Key Cryptography - Examples
Digital Signature Standard (DSS)
Rivest, Shamir and Adleman (RSA)
ElGamal
Elliptic Curve cryptography
etc ...
23. HASH Function
A cryptographic hash function is a
hash function that takes an arbitrary
block of data and returns a fixed-size
bit string, the cryptographic hash
value, such that any (accidental or
intentional) change to the data will
(with very high probability) change the
hash value.
The data to be encoded are often
called the message, and the hash
value is sometimes called the
message digest or simply digest.
24. What is a HASH Function
The ideal cryptographic hash function has four main properties:
it is easy to compute the hash value for any given message
it is infeasible to generate a message that has a given hash
it is infeasible to modify a message without changing the hash
it is infeasible to find two different messages with the same hash.
25. HASH Function Algorithm - Examples
Message Digest (MD)
MD2, MD4, MD5, MD6
Secure Hash Function (SHA)
SHA-0, SHA-1, SHA-2, and SHA-3
RACE Integrity Primitives Evaluation Message Digest (RIPEMD)
RIPEMD-128, and RIPEMD-160. There also exist 256, and 320-bit versions
of this algorithm.
26. HASH Function Algorithm - Examples
Message Digest (MD)
MD2, MD4, MD5, MD6
Secure Hash Function (SHA)
SHA-0, SHA-1, SHA-2, and SHA-3
RACE Integrity Primitives Evaluation
Message Digest (RIPEMD)
RIPEMD-128, and RIPEMD-160. There
also exist 256, and 320-bit versions of
this algorithm.
27. Applications of Hash Functions
Password Storage
Hash functions provide protection to password storage.
Instead of storing password in clear, mostly all logon
processes store the hash values of passwords in the file.
The Password file consists of a table of pairs which are in the
form (user id, h(P))
Data Integrity Check
Data integrity check is a most common application of the
hash functions. It is used to generate the checksums on data
files. This application provides assurance to the user about
correctness of the data.
28. Applications of Hash Functions - Examples
Checking
$ md5sum file1.dat
MD5 Sum = a4c0d35c95a63a805915367dcfe6b751
$ md5sum file2.dat
MD5 Sum = a4c0d35c95a63a805915367dcfe6b751
$ sha512sum Yellow.jpg
SHA256 Sum =
ee9d1963eb1481f6a8e9c80aa02d33772aa40fbfd9797df4f5333
a7a90bb902b5c143be3db9c1c7b2800274b163515af9315f40b4
d10e3cfce023c885d784e4d