Chapter 2 – Classical Encryption Techniques Many savages at the present day regard their names as vital parts of themselves, and therefore Looks like you’ve clipped this slide to already. CLASSICAL ENCRYPTION TECHNIQUES There are two requirements for secure use of conventional encryption: 1. 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 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. 1. 1. Inam Ul Haq MS Computer Science (Sweden), Discussion forum: Member of IEEE, ACM, Movement… See our User Agreement and Privacy Policy. Semester : III World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. Looks like you’ve clipped this slide to already. polyalphabetic cipher techniques have the following features in common: A set of related monoalphabetic substitution rules is used. 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. Now customize the name of a clipboard to store your clips. View 2-Classical Encryption.ppt from CSE 651 at Palestine Technical University - Kadoorie. Clipping is a handy way to collect important slides you want to go back to later. Network Security and a Brief Review of Classical Encryption Techniques Lecture Notes on “Computer and Network Security” by Avi Kak ( 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. Topic : Classical Encryption Techniques 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. 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. NETWORK SECURITY See our User Agreement and Privacy Policy. You can change your ad preferences anytime. You can change your ad preferences anytime. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. 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. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. In cryptography there are two processes i.e. 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. 8. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Of the plaintext is viewed as a sequence of bits, then substitution involves replacing plaintext bit … 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. encryption and decryption performed at sender and receiver end respectively. There are two basic building blocks of all encryption techniques: substitution and transposition. 2. Cryptography & Network Security: 3.Classical Encryption Techniques Caesar Cipher Fig 2.4 : brute-force cryptanalysis - Simply try all the 25 possible keys. Presented By, Encryption is the processes where a simple multimedia data is combined with some … MSc (CS&IT), 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.