Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter 2 – “Classical Encryption Techniques”. A very different kind of mapping is achieved by performing some sort of permutation on the plaintext letters. A substitution technique is one in which the letters of plaintext are replaced by other letters or by numbers or symbols. Classical Techniques are based on two building blocks ; Substitution The letters of plaintext are replaced by other letters or by numbers or symbols. 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. 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 ([email protected]) 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. • 1. symmetric ciphers • 2. variety of algorithms 4. There are two requirements for secure use of conventional encryption: 1. See our Privacy Policy and User Agreement for details. Classical Encryption Techniques in Network Security. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. View ch02.ppt from CSE 402 at JK Lakshmipat University. Nadar Saraswathi college of Arts & Science, Unit : I 3. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Looks like you’ve clipped this slide to already. Classical Encryption Techniques. Hashing. NETWORK SECURITY 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. You can change your ad preferences anytime. Encryption is the processes where a simple multimedia data is combined with some … 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). Cryptography & Network Security: 3.Classical Encryption Techniques Caesar Cipher Fig 2.4 : brute-force cryptanalysis - Simply try all the 25 possible keys. Head, Dept. Thanjavur. The encryption/decryption algorithm are known 2. Symmetric Encryption,Cryptographic Systems,Encryption Scheme Security,Substitution Technique,Transposition Techniques ,Rotor Machines. Fourth Edition ; by William Stallings ; Lecture slides by Lawrie Brown (Modified by Prof. M. Singhal, U of Kentucky) 2 Symmetric Encryption. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 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. 8. 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. 2. Presented By, You can change your ad preferences anytime. Classical Encryption Techniques Explained at Purdue University (PDF): These lecture notes describe historical encryption methods and how they are used today. This general idea is illustrated in Figure 1 for the case of N = 4. See our Privacy Policy and User Agreement for details. Introduction to Classical Cryptography by Noted Textbook Author: This overview includes information on how classical cryptography techniques relate to the modern day. Bon Secours College For Women Network Security Classical Encryption Techniques. Classical Encryption Techniques CSE 651: Introduction to Network Security Classical encryption techniques • As opposed to Classical Encryption Techniques 2 A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. This row/column dimension is referred to as the block length. . CLASSICAL ENCRYPTION TECHNIQUES . M. FLORENCE DAYANA/DATABASE MANAGEMENT SYSYTEM, M.Florence Dayana/Cryptography and Network security, M.FLORENCE DAYANA WEB DESIGN -Unit 5 XML, M.FLORENCE DAYANA WEB DESIGN -Unit 3 (frames), M.FLORENCEDAYANA WEB DESIGN -Unit 2 (html), No public clipboards found for this slide. View 2-Classical Encryption.ppt from CSE 651 at JK Lakshmipat University. In cryptography there are two processes i.e. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. CLASSICAL ENCRYPTION TECHNIQUES 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. (In general, though, N is set to 64 or multiples thereof.) 2. 1 SUBSTITUTION TECHNIQUES . Inam Ul Haq MS Computer Science (Sweden) [email protected], [email protected] Discussion forum: questions.computingcage.com Member of IEEE, ACM, Movement… Now customize the name of a clipboard to store your clips. MSc (CS&IT), 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. 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. There are only 25 keys to try 3. See our User Agreement and Privacy Policy. The encryption algorithm must be strong. Clipping is a handy way to collect important slides you want to go back to later. A key determines which particular rule is chosen for a given transformation. 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. encryption and decryption performed at sender and receiver end respectively. Class : II MSc., CS If you continue browsing the site, you agree to the use of cookies on this website. Classical Encryption Techniques 1 Symmetric Encryption Substitution Techniques Caesar Cipher Monoalphabetic Cipher Playfair Cipher Hill Cipher 9. 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. 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. 1. 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. 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 We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 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. polyalphabetic cipher techniques have the following features in common: A set of related monoalphabetic substitution rules is used. 2. It remains by far the most widely used of the two types of encryption. There are two basic building blocks of all encryption techniques: substitution and transposition. Looks like you’ve clipped this slide to already. 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. of CA This technique is referred to as a transposition cipher. M.Ramya, Topic : Classical Encryption Techniques 2 Outline • Introduction • Symmetric Cipher Model • Substitution Techniques • Transposition Techniques • Rotor Machines • Steganography. Of the plaintext is viewed as a sequence of bits, then substitution involves replacing plaintext bit … the row and column dimensions of an encryption or decryption key are the same. These two keys are mathematically linked with each other. Title: Chapter 2 Classical Encryption Techniques 1 Chapter 2 Classical Encryption Techniques. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. Theni. Three important characteristic of this problems 1. 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 TRANSPOSITION TECHNIQUES . View lecture 2(first).ppt.pptx from COMPUTER I 151001320 at The Hashemite University. Now customize the name of a clipboard to store your clips. 1. Semester : III 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. All the techniques examined so far involve the substitution of a ciphertext symbol for a plaintext symbol. 1. 9 The basic principle of the rotor machine is illustrated in Figure 2.8. OUTPUT: The block length of an encryption/decryption key. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Chapter 2 – Classical Encryption Techniques Many savages at the present day regard their names as vital parts of themselves, and therefore There are many types of the substitution techniques such as … Public key encryption algorithm uses pair of keys, one of which is a secret key and one of which is public. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. 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. Title: Chapter 2: Classical Encryption Techniques 1 Chapter 2 Classical Encryption Techniques. In terms of security, hashing is a technique used to encrypt data and generate unpredictable hash values. Classical encryption techniques • As … Classical Encryption Techniques Information System Security Lecture 1 Classical encryption techniques • As 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 Cryptosystems ... Encryption and decryption keys of a Hill cipher are square matrices, i.e. If you continue browsing the site, you agree to the use of cookies on this website. If you continue browsing the site, you agree to the use of cookies on this website. 2/15/20191. See our User Agreement and Privacy Policy. 1. Clipping is a handy way to collect important slides you want to go back to later. about classical encryption techniques Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 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