PPT-Security of Message Digests

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 . 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 William Stallings, 6. th. Ed. . Chapter 1. Overview. . “The combination of space, time, and strength that must be considered as the basic elements of this theory of defense makes this a fairly complicated matter. Consequently, it is not easy to find a fixed point of departure.”. Sixth Edition. by William Stallings . Chapter 19. Electronic Mail Security. “Despite the refusal of VADM Poindexter and LtCol North to appear, the Board's access to other sources of information filled much of this gap. The FBI provided documents taken from the files of the National Security Advisor and relevant NSC staff members, including messages from the PROF system between VADM Poindexter and LtCol North. The PROF messages were conversations by computer, written at the time events occurred and presumed by the writers to be protected from disclosure. In this sense, they provide a first-hand, contemporaneous account of events.”. CSCI 5857: Encoding and Encryption. Outline. Information integrity issues . Message digests . Hash functions. Insuring information integrity. Attacks on message digests. Preimage. attacks. Collision attacks. 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.. &. CYBER LAWS . By. R K BAGGA. 2. “ 60% of networks are penetrated over 30 times a year ”. “ . On average, every site newly installed on the Web will be accessed within 28 seconds and attacked within 5 hours. Operating System Principles. Security. Security. The Security Problem. Program Threats. System and Network Threats. Cryptography as a Security Tool. User Authentication. Implementing Security Defenses. 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.. M.Sc. Course – 2016. By. Dr. Bashar M. . Nema. Cryptography and Network Security. Sixth Edition. by William Stallings . Chapter 1. Overview. “The combination of space, time, and strength that must be considered as the basic elements of this theory of defense makes this a fairly complicated matter. Consequently, it is not easy to find a fixed point of departure.”. 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 . 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. Computational Security . against Eavesdropper. Constructing Secure Encryption . Schemes against Eavesdropper. Chosen Plaintext Attacks and . CPA-Security. Readings: . Katz . and . Lindell Chapter 3.1-3.4. Cryptography Lecture 6 Clicker quiz Let G(x) = x || parity(x). Which of the following proves that G is not a pseudorandom generator? G is not expanding Consider the following distinguisher D: D(y) outputs 1 PKothakotaNear PakalaChittoorLECTURE NOTESDEPARTMENT OFCOMPUTER SCIENCE AND ENGINEERINGSUBJECT NAME INFORMATION SECURITYBRANCH CSEYEAR AND SEMESTER IV I COURSE BTECHREGULATIONR15INDEX1Unit-I TopicPag