PPT-1 DES Block Cipher The Data Encryption Standard (DES):

This algorithm adopted in 1977 by the National Institute of Standards and Technology NIST The algorithm itself is referred to as the Data Encryption Algorithm DEA For DES data are encrypted in . Princeton University . Spring 2010. Boaz Barak. Lecture 7: . Chosen Plaintext Attack. Block . Ciphers. Short Review of PRF construction. 2. G. f. s. (x). Snapshot after . i. invocations.. Short Review of PRF construction. 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.. CSE 5351: Introduction to Cryptography. Reading assignment:. Chapter 2. Chapter 3 (sections 3.1-3.4). You may skip proofs, but are encouraged to read some of them.. 2. Computational Difficulty (One-Way Functions). Sixth Edition. by William Stallings . Chapter 3. Block Ciphers and the Data Encryption Standard. “But . what is the use of the cipher message without the cipher. ?”. -- The Valley of Fear, . Sir Arthur Conan Doyle. Sixth Edition. by William Stallings . Chapter 3. Block Ciphers and the Data Encryption Standard. “All the afternoon Mungo had been working on Stern's code, principally with the aid of the latest messages which he had copied down at the Nevin Square drop. Stern was very confident. He must be well aware London Central knew about that drop. It was obvious that they didn't care how often Mungo read their messages, so confident were they in the impenetrability of the code.”. Fifth Edition. by William Stallings. Chapter 2. Symmetric Encryption and . Message Confidentiality. Some Basic Terminology. Plaintext - original message . Ciphertext - coded message . Cipher - algorithm for transforming plaintext to ciphertext . An . Introduction to . Block Ciphers. Rocky K. C. . Chang, February 2013. Outline. 2. Product and iterated . ciphers. A simple substitution-permutation network. DES and AES. Modes of operations. Cipher block chaining. Anamika. Sharma. Network Security. Security. is a state of well-being of information and infrastructures in which the possibility of successful yet undetected theft, tampering, and disruption of information and services is kept low or tolerable. B. R. Chandavarkar. Asst. Prof., CSE Dept.,. NITK, Surathkal.. brcnitk@gmail.com. brc.nitk.ac.in. Contents. Data Security. Introduction. Transposition Techniques. Substitution Techniques. Classification. Information and Network Security. . Dr. . Hadi. AL . Saadi. The objective of this chapter is to illustrate the principles of . modern symmetric ciphers. .. The . Data Encryption Standard. (. DES. Sixth Edition. by William Stallings . Chapter 3. Block Ciphers and the Data Encryption Standard. “All the afternoon Mungo had been working on Stern's code, principally with the aid of the latest messages which he had copied down at the Nevin Square drop. Stern was very confident. He must be well aware London Central knew about that drop. It was obvious that they didn't care how often Mungo read their messages, so confident were they in the impenetrability of the code.”. Substitution. Classical Ciphers. Transposition. Data Encryption Standard 1977. Modern Cryptography. “New Directions in Cryptography” 1976. Symmetric . key block ciphers. Public key ciphers. Stream ciphers. Chapter . 2: . Symmetric Encryption. Fourth Edition. by William Stallings . (Based on . Lecture slides by Lawrie Brown. ). Outline. Symmetric encryption. Block encryption algorithms. Stream ciphers. Block cipher modes of operations. COS 433: Cryptography Princeton University Spring 2010 Boaz Barak Lecture 7: Chosen Plaintext Attack Block Ciphers Short Review of PRF construction 2 G f s (x) Snapshot after i invocations. Short Review of PRF construction