• 1. symmetric ciphers • 2. variety of algorithms 4. Classical Cryptosystems ... Encryption and decryption keys of a Hill cipher are square matrices, i.e. 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 Class : II MSc., CS 2. Classical Encryption Techniques in Network Security. View 2-Classical Encryption.ppt from CSE 651 at Palestine Technical University - Kadoorie. Looks like you’ve clipped this slide to already. 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. If you continue browsing the site, you agree to the use of cookies on this website. 9 The basic principle of the rotor machine is illustrated in Figure 2.8. 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. Looks like you’ve clipped this slide to already. See our Privacy Policy and User Agreement for details. 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 Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. This technique is referred to as a transposition cipher. Head, Dept. —The Adventure of the Dancing Men , Sir Arthur Conan Doyle Outline • We will consider: Classical Encryption Techniques 2 A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. M.Ramya, In cryptography there are two processes i.e. Thanjavur. 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. Clipping is a handy way to collect important slides you want to go back to later. Classical Techniques are based on two building blocks ; Substitution The letters of plaintext are replaced by other letters or by numbers or symbols. 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. There are two basic building blocks of all encryption techniques: substitution and transposition. Three important characteristic of this problems 1. Classical Encryption Techniques 1 Symmetric Encryption Substitution Techniques Caesar Cipher Monoalphabetic Cipher Playfair Cipher Hill Cipher 9. Name of the Staff : M.FLORENCE DAYANA M.C.A.,M.Phil.,(Ph.D)., 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. View lecture 2(first).ppt.pptx from COMPUTER I 151001320 at The Hashemite University. 2. MSc (CS&IT), 3. If you continue browsing the site, you agree to the use of cookies on this website. 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 OUTPUT: The block length of an encryption/decryption key. You can change your ad preferences anytime. There are only 25 keys to try 3. 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). 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. Symmetric encryption ; Secret key encryption ; Shared key encryption ; 2 Symmetric Encryption. You can change your ad preferences anytime. 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. It remains by far the most widely used of the two types of encryption. CLASSICAL ENCRYPTION TECHNIQUES . See our User Agreement and Privacy Policy. Classical encryption techniques • As … the row and column dimensions of an encryption or decryption key are the same. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. These two keys are mathematically linked with each other. The encryption/decryption algorithm are known 2. Title: Chapter 2: Classical Encryption Techniques 1 Chapter 2 Classical Encryption Techniques. 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. 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… Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. (In general, though, N is set to 64 or multiples thereof.) CLASSICAL ENCRYPTION TECHNIQUES Of the plaintext is viewed as a sequence of bits, then substitution involves replacing plaintext bit … Cryptography & Network Security: 3.Classical Encryption Techniques Caesar Cipher Fig 2.4 : brute-force cryptanalysis - Simply try all the 25 possible keys. Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter 2 – “Classical Encryption Techniques”. All the techniques examined so far involve the substitution of a ciphertext symbol for a plaintext symbol. Theni. There are two requirements for secure use of conventional encryption: 1. 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. Semester : III This row/column dimension is referred to as the block length. 1 SUBSTITUTION TECHNIQUES . encryption and decryption performed at sender and receiver end respectively. Now customize the name of a clipboard to store your clips. Encryption is the processes where a simple multimedia data is combined with some … Introduction to Classical Cryptography by Noted Textbook Author: This overview includes information on how classical cryptography techniques relate to the modern day. See our Privacy Policy and User Agreement for details. A key determines which particular rule is chosen for a given transformation. Symmetric Encryption,Cryptographic Systems,Encryption Scheme Security,Substitution Technique,Transposition Techniques ,Rotor Machines. •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. Classical Encryption Techniques Information System Security Lecture 1 Classical encryption techniques • As 8. 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. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. NETWORK SECURITY View 2-Classical Encryption.ppt from CSE 651 at JK Lakshmipat University. 1. Unit : I View ch02.ppt from CSE 402 at JK Lakshmipat University. A substitution technique is one in which the letters of plaintext are replaced by other letters or by numbers or symbols. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 1. 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