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 MSc (CS&IT), We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. This row/column dimension is referred to as the block length. M.Ramya, 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. Classical Encryption Techniques Explained at Purdue University (PDF): These lecture notes describe historical encryption methods and how they are used today. Looks like you’ve clipped this slide to already. Of the plaintext is viewed as a sequence of bits, then substitution involves replacing plaintext bit … Three important characteristic of this problems 1. Classical Encryption Techniques Information System Security Lecture 1 Classical encryption techniques • As Cryptography & Network Security: 3.Classical Encryption Techniques Caesar Cipher Fig 2.4 : brute-force cryptanalysis - Simply try all the 25 possible keys. If you continue browsing the site, you agree to the use of cookies on this website. 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. of CA 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. 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 CSE 651: Introduction to Network Security Classical encryption techniques • As opposed to In cryptography there are two processes i.e. Classical Techniques are based on two building blocks ; Substitution The letters of plaintext are replaced by other letters or by numbers or symbols. See our Privacy Policy and User Agreement for details. •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. 2/15/20191. Thanjavur. See our User Agreement and Privacy Policy. If you continue browsing the site, you agree to the use of cookies on this website. Class : II MSc., CS A very different kind of mapping is achieved by performing some sort of permutation on the plaintext letters. 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. You can change your ad preferences anytime. Hashing. Theni. Title: Chapter 2 Classical Encryption Techniques 1 Chapter 2 Classical Encryption Techniques. CLASSICAL ENCRYPTION TECHNIQUES 2. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 1. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 2. There are many types of the substitution techniques such as … Unit : I View lecture 2(first).ppt.pptx from COMPUTER I 151001320 at The Hashemite University. 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. There are two basic building blocks of all encryption techniques: substitution and transposition. 1 SUBSTITUTION TECHNIQUES . CLASSICAL ENCRYPTION TECHNIQUES . Symmetric encryption ; Secret key encryption ; Shared key encryption ; 2 Symmetric Encryption. • 1. symmetric ciphers • 2. variety of algorithms 4. NETWORK SECURITY See our User Agreement and Privacy Policy. Title: Chapter 2: Classical Encryption Techniques 1 Chapter 2 Classical Encryption Techniques. 1. View ch02.ppt from CSE 402 at JK Lakshmipat University. Presented By, 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. In terms of security, hashing is a technique used to encrypt data and generate unpredictable hash values. Classical Cryptosystems ... Encryption and decryption keys of a Hill cipher are square matrices, i.e. 3. 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. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Classical Encryption Techniques. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. There are two requirements for secure use of conventional encryption: 1. Name of the Staff : M.FLORENCE DAYANA M.C.A.,M.Phil.,(Ph.D)., TRANSPOSITION TECHNIQUES . Semester : III See our Privacy Policy and User Agreement for details. This technique is referred to as a transposition cipher. Network Security Classical Encryption Techniques. Classical Encryption Techniques CSE 651: Introduction to Network Security Classical encryption encryption and decryption performed at sender and receiver end respectively. Public key encryption algorithm uses pair of keys, one of which is a secret key and one of which is public. Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter 2 – “Classical Encryption Techniques”. Classical Encryption Techniques in Network Security. the row and column dimensions of an encryption or decryption key are the same. about classical encryption techniques Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Clipping is a handy way to collect important slides you want to go back to later. Head, Dept. 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… 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. Chapter 2 – Classical Encryption Techniques Many savages at the present day regard their names as vital parts of themselves, and therefore Bon Secours College For Women 2 Outline • Introduction • Symmetric Cipher Model • Substitution Techniques • Transposition Techniques • Rotor Machines • Steganography. 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. 2. 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. Introduction to Classical Cryptography by Noted Textbook Author: This overview includes information on how classical cryptography techniques relate to the modern day. Encryption is the processes where a simple multimedia data is combined with some … The encryption algorithm must be strong. Nadar Saraswathi college of Arts & Science, 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. 1. If you continue browsing the site, you agree to the use of cookies on this website. View 2-Classical Encryption.ppt from CSE 651 at JK Lakshmipat University. polyalphabetic cipher techniques have the following features in common: A set of related monoalphabetic substitution rules is used. 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 8. Classical Encryption Techniques 1 Symmetric Encryption Substitution Techniques Caesar Cipher Monoalphabetic Cipher Playfair Cipher Hill Cipher 9. Topic : Classical Encryption Techniques 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. A substitution technique is one in which the letters of plaintext are replaced by other letters or by numbers or symbols. Now customize the name of a clipboard to store your clips. 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. Now customize the name of a clipboard to store your clips. 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). 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 - 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 This general idea is illustrated in Figure 1 for the case of N = 4. Classical Encryption Techniques 2 A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. View 2-Classical Encryption.ppt from CSE 651 at Palestine Technical University - Kadoorie. —The Adventure of the Dancing Men , Sir Arthur Conan Doyle Outline • We will consider: These two keys are mathematically linked with each other. There are only 25 keys to try 3. . Clipping is a handy way to collect important slides you want to go back to later. 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. All the techniques examined so far involve the substitution of a ciphertext symbol for a plaintext symbol. 1. 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. You can change your ad preferences anytime. 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. A key determines which particular rule is chosen for a given transformation. Looks like you’ve clipped this slide to already. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. OUTPUT: The block length of an encryption/decryption key. 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. 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. 9 The basic principle of the rotor machine is illustrated in Figure 2.8. It remains by far the most widely used of the two types of encryption. Is set to 64 or multiples thereof. 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