PPT-Message integrity

Message Auth Codes Online Cryptography Course Dan Boneh Message Integrity Goal integrity no confidentiality Examples Protecting public binaries on disk . CBC-MAC and NMAC. Online Cryptography Course Dan Boneh. MACs and PRFs. Recall: secure PRF . F ⇒. . secure MAC, as long as |Y| is large. . S(k, m) = F(k, m). A Parallel MAC. Online Cryptography Course Dan Boneh. ECBC and NMAC are sequential.. Can we build a parallel MAC from a small PRF ??. Construction . 3: PMAC – parallel MAC. CSCI 5857: Encoding and Encryption. Outline. Information integrity issues . Message digests . Hash functions. Insuring information integrity. Attacks on message digests. Preimage. attacks. Collision attacks. /B. 609. :. . Introduction to. Cryptography. Fall 2015 . . Lecture 10.  . 1. Tuesday’s lecture:. Pseudorandom permutations (PRPs). Block ciphers. Modes of operation. Today’s lecture:. Message authentication codes (MACs). MACs based on PRFs. Online Cryptography Course Dan Boneh. Review: Secure . MACs. MAC: signing alg. . S(. k,m. )⟶t . and verification alg. . V(. k,m,t. MAC padding. Online Cryptography Course Dan Boneh. Recall: ECBC. -. MAC. F(k,. ). F(k,. ). F(k,. ). m[0]. m[1]. m[3]. m[4]. . . F(k,. ). . F(. JEJI RAMCHAND VEDULLAPALLI. Content . Introduction. Authentication. Message Integrity and Confidentiality. Secure Group Communications. Example: Kerberos. Introduction. How to make communication between clients and servers secure ?. Stein. CTO. Communications Security. Communications security. (COMSEC) means preventing unauthorized access to communications infrastructure and communicated messages, while still providing the communications service between intended parties . IT IS 3105 (FALL 2009). PHP Setup and Introduction. Mohamed Shehab. Security Overview. Authentication Based APIs. Private REST APIs. These APIs require the execution of an authentication protocol to ensure that each application is who they claim they are.. Public Key Algorithms. Symmetric Key Algorithms face an inherent problem. Keys must be distributed to all parties but kept secret from potential attackers. Introduced by . Diffie. and Hellman in 1976. Distributed Systems. SSD. Basic Flash . Operations: read, erase, and program. Bit, page, block, and bank. Wear out. Flash . translation layer (FTL) – control logic to turn client reads and writes into flash operations. Definitions. Online Cryptography Course Dan Boneh. Goals. An . authenticated encryption . system (E,D) is a cipher where . As usual: E: K × M . × . N . ⟶ C. Hash Functions. 12/7/2010. 1. Data Integrity. Message Authentication Code (MAC). Cryptographic hash function h(K,M) with two inputs:. Secret key K. Message M. Message integrity with MAC. Sequence of messages transmitted over insecure channel. Online Cryptography Course Dan Boneh. Message Integrity. Goal: . integrity. , no . confidentiality. .. Examples:. Protecting . public binaries on disk. .