PPT-Information Integrity and Message Digests

CSCI 5857 Encoding and Encryption Outline Information integrity issues Message digests Hash functions Insuring information integrity Attacks on message digests Preimage attacks Collision attacks. Digests group cases by topic and provide short summaries on what the cited cases say about t he given subject Digest sets cover cases from a specific jurisdiction or general subject area Topical digests such as the Bankruptcy and Real Estate digests 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). Message Auth. Codes. Online Cryptography Course Dan Boneh. Message Integrity. Goal: . integrity. , no . confidentiality. .. Examples:. Protecting . public binaries on disk. . draft-korhonen-dime-e2e-security-00. Jouni. . Korhonen. , . Hannes. . Tschofenig. Dime WG, IETF#83. Overview. Two aspects: . Authentication and Key Exchange. Actual . AVP protection.. Requirements.. Dan Fleck. CS 469: Security Engineering. These slides are modified with permission from Bill Young (. Univ. of Texas). Coming up: Meaning of Computer Security. 1. Meaning of Computer . Security. Recall that computer security is described as encompassing at least:. 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. Slides by . Prem. Uppuluri. Some of the slides contain material from sources that are cited in those specific slides.. So far…. We looked at:. Symmetric or secret-key cryptography. Primarily used for encryption/decryption.. CSCI 5857: Encoding and Encryption. Outline. Attacks on message digests. Preimage. attacks. Collision attacks. Properties of a good hash function. Mathematical background. Pigeonhole principle. Birthday . 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.. Through the Internet and Social Media. Michael DiDiego. Draft Personal Research Opinion Paper . Wilmington University . May 18, 2017. Figure 1 The Dewitt-Clinton, One of the Earliest Railroad Carriages . 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. Integrity Models. James Hook. CS 591: Introduction to Computer Security. 10/12/09 10:19. Last lecture. Discussion?. 10/12/09 10:19. Last Lecture. Bell . LaPadula. Confidentiality. Lattice of security levels. Online Cryptography Course Dan Boneh. Message Integrity. Goal: . integrity. , no . confidentiality. .. Examples:. Protecting . public binaries on disk. .