'Chosen ciphertext' presentation slideshows

Cryptanalysis

Fundamentals of Symmetric-Key Cryptography. Introduction to Practical Cryptography. Cryptanalysis. Agenda. Overview Block Ciphers: Linear Differential Other Attacks Statistical Analysis Stream Ciphers General Side Channel Attacks. Overview. What is cryptanalysis? Theory

952 views • 90 slides

Chapter 2 Basic Encryption and Decryption (part B)

Chapter 2 Basic Encryption and Decryption (part B). Transpositions (Permutations). P.52 Transposition: an encryption in which the letters of the message are rearranged Also known as permutations Compare the goals: Substitution ? confusion Transposition ? diffusion. Confusion vs Diffusion.

289 views • 28 slides

Computer Security CS 426 Lecture 3

Computer Security CS 426 Lecture 3. Cryptography: One-time Pad, Information Theoretical Security, and Stream CIphers. One-Time Pad. Fix the vulnerability of the mono-alphabetical substitution cipher by encrypting letters in different locations differently

329 views • 19 slides

CMSC 414 Computer and Network Security Lecture 4

CMSC 414 Computer and Network Security Lecture 4. Jonathan Katz. Announcements. HW1 out Work in teams of two students Both students should contribute to all problems Material covered on HW1 is fair game for the exam Post on Piazza if you are looking for a partner

317 views • 17 slides

CMSC 414 Computer and Network Security Lecture 4

CMSC 414 Computer and Network Security Lecture 4. Jonathan Katz. Announcements. HW1 out Work in teams of two students Both students should contribute to all problems Material covered on HW1 is fair game for the exam Post on Piazza if you are looking for a partner

177 views • 17 slides

Overview

Overview. Basic Communication Scenario for Cryptography Possible Attacks (a) Ciphertext only (b) Known plaintext (c) Chosen plaintext (d) Chosen ciphertext. Basic Communication Scenario for Cryptography. Symmetric vs. Public Key Algorithms. Symmetric key algorithms

171 views • 8 slides

RSA: More about attacks

110 views • 8 slides