Now customize the name of a clipboard to store your clips. In terms of security, hashing is a technique used to encrypt data and generate unpredictable hash values. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. of CA Thanjavur. the row and column dimensions of an encryption or decryption key are the same. 1. View 2-Classical Encryption.ppt from CSE 651 at JK Lakshmipat University. Topic : Classical Encryption Techniques Now customize the name of a clipboard to store your clips. Analysis of classical encryption techniques in cloud computing for more ieee paper / full abstract / implementation , just visit www.redpel.com Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Looks like you’ve clipped this slide to already. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. NETWORK SECURITY 2. CLASSICAL ENCRYPTION TECHNIQUES . If you continue browsing the site, you agree to the use of cookies on this website. Cryptography & Network Security: 3.Classical Encryption Techniques Playfair Cipher Keyword : mornarchy Filling in the letters of the keyword from left to rig ht and from top to bottom Filling in the reminder of the matrix with the remai ning letters in alphabetic order I and J count as one letter Introduction to Classical Cryptography by Noted Textbook Author: This overview includes information on how classical cryptography techniques relate to the modern day. There are two basic building blocks of all encryption techniques: substitution and transposition. Classical Cryptosystems ... Encryption and decryption keys of a Hill cipher are square matrices, i.e. . Name of the Staff : M.FLORENCE DAYANA M.C.A.,M.Phil.,(Ph.D)., •In a modern block cipher (but still using a classical encryption method), we replace a block of N bits from the plaintext with a block of N bits from the ciphertext. At a minimum, an opponent who knows the algorithm and has access to one or more ciphertexts would be unable to decipher the ciphertext or figure out the key. MSc (CS&IT), Looks like you’ve clipped this slide to already. 8. A key determines which particular rule is chosen for a given transformation. Classical Encryption Techniques in Network Security. Public key encryption algorithm uses pair of keys, one of which is a secret key and one of which is public. Fourth Edition ; by William Stallings ; Lecture slides by Lawrie Brown (Modified by Prof. M. Singhal, U of Kentucky) 2 Symmetric Encryption. If you continue browsing the site, you agree to the use of cookies on this website. Network Security and a Brief Review of Classical Encryption Techniques Lecture Notes on “Computer and Network Security” by Avi Kak (kak@purdue.edu) May 7, 2020 11:31am c 2020 Avinash Kak, Purdue University Goals: •To introduce the rudiments of the vocabulary of computer and network security and that of encryption/decryption. Clipping is a handy way to collect important slides you want to go back to later. These two keys are mathematically linked with each other. Head, Dept. Title: Chapter 2 Classical Encryption Techniques 1 Chapter 2 Classical Encryption Techniques. Symmetric encryption, also referred to as conventional encryption or single-key encryption, was the only type of encryption in use prior to the development of public-key encryption in the 1970s. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Classical Encryption Techniques 1 Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. Presented By, Classical Encryption Techniques - Title: Classical Encryption Techniques Author: lai Last modified by: Steve Lai Created Date: 9/9/2008 7:19:38 PM Document presentation format: On-screen Show (4:3) | PowerPoint PPT presentation | free to view View 2-Classical Encryption.ppt from CSE 651 at Palestine Technical University - Kadoorie. See our User Agreement and Privacy Policy. 9 The basic principle of the rotor machine is illustrated in Figure 2.8. Classical Encryption Techniques - Title: Classical Encryption Techniques Author: lai Last modified by: Steve Lai Created Date: 9/9/2008 7:19:38 PM Document presentation format: On-screen Show (4:3) | PowerPoint PPT presentation | free to view There are only 25 keys to try 3. Symmetric Encryption • Also referred to as conventional encryption or single-key encryption • Was the only type of encryption in use prior to the development of public-key encryption in the 1970s • Remains by far the most widely used of the two types of encryption. 2/15/20191. about classical encryption techniques Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. All the techniques examined so far involve the substitution of a ciphertext symbol for a plaintext symbol. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. CLASSICAL ENCRYPTION TECHNIQUES Before the introduction of DES, the most important application of the principle of multiple stages of encryption was a class of systems known as rotor machines. Classical Encryption Techniques. Theni. Hashing. Classical Techniques are based on two building blocks ; Substitution The letters of plaintext are replaced by other letters or by numbers or symbols. 2 Outline • Introduction • Symmetric Cipher Model • Substitution Techniques • Transposition Techniques • Rotor Machines • Steganography. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 1. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Network Security Classical Encryption Techniques. If you continue browsing the site, you agree to the use of cookies on this website. This row/column dimension is referred to as the block length. Class : II MSc., CS NETWORK DEVICE SECURITY NETWORK HARDENING, DIGITAL VIDEO DATA SIZING AND OBJECT BASED ANIMATION, Mining single dimensional boolean association rules from transactional, No public clipboards found for this slide. Title: Chapter 2: Classical Encryption Techniques 1 Chapter 2 Classical Encryption Techniques. There are two requirements for secure use of conventional encryption: 1. Classical Encryption Techniques Information System Security Lecture 1 Classical encryption techniques • As A substitution technique is one in which the letters of plaintext are replaced by other letters or by numbers or symbols. View lecture 2(first).ppt.pptx from COMPUTER I 151001320 at The Hashemite University. Bon Secours College For Women In a stronger form, the opponent should be unable to decrypt ciphertexts or discover the key even if he or she has a number of ciphertexts together with the plaintext for each ciphertext. Of the plaintext is viewed as a sequence of bits, then substitution involves replacing plaintext bit … —The Adventure of the Dancing Men , Sir Arthur Conan Doyle Outline • We will consider: Classical Encryption Techniques CSE 651: Introduction to Network Security Classical encryption Clipping is a handy way to collect important slides you want to go back to later. It remains by far the most widely used of the two types of encryption. Inam Ul Haq MS Computer Science (Sweden) Inam.bth@gmail.com, mr.inam.ulhaq@ieee.org Discussion forum: questions.computingcage.com Member of IEEE, ACM, Movement… You can change your ad preferences anytime. TRANSPOSITION TECHNIQUES . 2. Classical Encryption Techniques Explained at Purdue University (PDF): These lecture notes describe historical encryption methods and how they are used today. Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter 2 – “Classical Encryption Techniques”. You can change your ad preferences anytime. See our User Agreement and Privacy Policy. 1. See our Privacy Policy and User Agreement for details. Plaintext encrypted two letters at a time ; If a pair is a repeated letter, insert a filler like 'X', ex: “Communication" encrypts as “Com x munication" If the letters appear on the same row of your table, replace them with the letters to their immediate right respectively (wrapping around to the left side of the row if a letter in the original pair was on the right side of the row). OUTPUT: The block length of an encryption/decryption key. See our Privacy Policy and User Agreement for details. Symmetric Encryption,Cryptographic Systems,Encryption Scheme Security,Substitution Technique,Transposition Techniques ,Rotor Machines. (In general, though, N is set to 64 or multiples thereof.) In cryptography there are two processes i.e. 3. Classic Encryption Techniques All encryption techniques are based on 2 methods, which can be used separately or together: 1- Substitution 2- Transposition 1- Substitution Encryption Techniques: Substitution is an encryption technique where elements in the plaintext are replaced or mapped with another elements. This technique is referred to as a transposition cipher. Unformatted text preview: Lecture- 2 Classical Encryption Techniques By Dr. Rizwan Aslam Butt Assistant Professor NED UET Karachi Data Security TC-522 Symmetric Encryption Symmetric encryption, also referred to as conventional encryption or single-key encryption, was the only type of encryption in use prior to the development of public-key encryption in the 1970s. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. A very different kind of mapping is achieved by performing some sort of permutation on the plaintext letters. Three important characteristic of this problems 1. Semester : III The encryption algorithm must be strong. 1 SUBSTITUTION TECHNIQUES . The encryption/decryption algorithm are known 2. If you continue browsing the site, you agree to the use of cookies on this website. This general idea is illustrated in Figure 1 for the case of N = 4. If you continue browsing the site, you agree to the use of cookies on this website. Cryptography is the technique which is used for doing secure communication between two parties in the public environment where unauthorized users and malicious attackers are present. View ch02.ppt from CSE 402 at JK Lakshmipat University. Cryptographic Techniques: Plain Text and Cipher Text, Substitution Techniques, Transposition Techniques, Encryption and Decryption, Symmetric and Asymmetric Key Cryptography, Steganography, Key Range and Key Size, Possible Types of Attacks. • 1. symmetric ciphers • 2. variety of algorithms 4. 1. There are many types of the substitution techniques such as … 2. M.Ramya, Classical Encryption Techniques CSE 651: Introduction to Network Security Classical encryption techniques • As opposed to Encryption is the processes where a simple multimedia data is combined with some … CLASSICAL ENCRYPTION TECHNIQUES Symmetric encryption, also referred to as conventional encryption or single-key encryption, was the only type of encryption in use prior to the development of public-key encryption in the 1970s. Classical Encryption Techniques 2 A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. Classical Encryption Techniques 1 Symmetric Encryption Substitution Techniques Caesar Cipher Monoalphabetic Cipher Playfair Cipher Hill Cipher 9. Unit : I Symmetric encryption ; Secret key encryption ; Shared key encryption ; 2 Symmetric Encryption. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. Chapter 2 – Classical Encryption Techniques Many savages at the present day regard their names as vital parts of themselves, and therefore Nadar Saraswathi college of Arts & Science, polyalphabetic cipher techniques have the following features in common: A set of related monoalphabetic substitution rules is used. Chapter 2 – Classical Encryption Techniques • "I am fairly familiar with all the forms of secret writings, and am myself the author of a trifling monograph upon the subject, in which I analyze one hundred and sixty separate ciphers," said Holmes. Cryptography & Network Security: 3.Classical Encryption Techniques Caesar Cipher Fig 2.4 : brute-force cryptanalysis - Simply try all the 25 possible keys. Classical encryption techniques • As … M. 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