PPT-Authenticated Encryption

CBC paddings attacks Online Cryptography Course Dan Boneh Recap Authenticated encryption CPA security ciphertext integrity C onfidentiality in presence of . Chosen . ciphertext. attacks. Online Cryptography Course Dan Boneh. Example chosen . ciphertext. attacks. A. dversary has . ciphertext. c that it wants to decrypt. Attacking non-atomic decryption. Online Cryptography Course Dan Boneh. SSH Binary Packet Protocol. Decryption:. s. tep 1: decrypt packet length field only (!). s. AEGIS . A Fast Authenticated Encryption Algorithm. . Hongjun Wu Bart Preneel . Nanyang Technological University. KU Leuven and iMinds. SAC 2013 . 2. Outline. Authenticated Encryption (AE). design rationale. 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). Constructions from ciphers and MACs. Online Cryptography Course Dan Boneh. … but first, some history. Authenticated Encryption (AE): introduced in . 2000 . Chris Edwards. IT Services. “All . confidential data . must . be encrypted where stored on a mobile . device” . Mobile Device Encryption Policy. What do we mean by “encrypted” ??. Password Protected. David Froot. Protecting data By encryption . How do we transmit information and data, especially over the internet, in a way that is secure and unreadable by anyone but the sender and recipient?. Encryption is simply the process of transforming information, such as plain text or numbers, using an algorithm. Only those with the algorithm can decipher the encrypted information, and even a relatively simple encryption technique can be difficult to decode without the key. . Schemes and Parameters. Joppe W. Bos. Microsoft Research. Contains joint work with Kristin . Lauter, . Jake Loftus and Michael Naehrig. Computing on Encrypted Data. Motivation. Outsource data and computation. Public Private Key Encryption. HTTPS. Encryption. String Encryption. You have an account on . facebook. , LinkedIn, YouTube etc. . Your login: . costanza@seinfeld.com. Your password is : . bosco. If this data was stored in a database, it might look like:. Is Encryption Safe?. Yes, Encryption is safe. The amount of time, energy and cost to crack most modern cryptographic technologies makes the act of attempting to decrypt encrypted code an expensive task that is, virtually speaking, inevitable. Although encryption does have vulnerabilities that rest largely outside of the power of the technology. Meaning if you give someone a USB with the key or tell them it.. Cryptography. Is:. A tremendous tool. The basis for many security mechanisms. Is not:. The solution to all security problems. Reliable unless implemented and used properly. Something you should try to invent yourself. Last time I promise. Unitary notation . Writing numbers only using 1. 1 -> 1. 2- > 11 . 3 -> 111. (n times). is shorthand for writing n in unitary.  . Family of games. Generalization of section 7.8 in the book (page 278). Crypto Concepts Symmetric encryption, Public key encryption, and TLS Cryptography Is: A tremendous tool The basis for many security mechanisms Is not: The solution to all security problems Reliable unless implemented and used properly Cryptography Lecture 9 Arpita Patra © Arpita Patra Recall Attack on cpa -secure scheme from PRF >> cpa -security to cca -security Definitions- cma , scma , cmva , scmva >> MAC