Slide 1 Message Digest  Can provide data integrity and non-repudation  Used to verify the authentication of a message  Idea: compute a hash on the message and send…

Slide 1 Identity Based Encryption Debdeep Mukhopadhyay Associate Professor Dept of Computer Sc and Engg, IIT Kharagpur Slide 2 Public Key Setting Alice and Bob might not…

Mobile Security and Payment Nour El Kadri University Of Ottawa Security Keep in mind: Security requires an overall approach A system is as secure as its weakest component…

Public-Key Authentication and Public-Key Infrastructure Vitaly Shmatikov CS 378 Authentication with Public Keys Only Alice can create a valid signature Signature is on a…

GZ der Informatik VIII Kryptografie, Digitale Signaturen, SET Univ.-Ass. DI. Markus Seidl University of Vienna [email protected] GZ Informatik / Betriebssysteme Cryptography…

History Elementary Number Theory RSA DH ECC Others * Key management Keep private key in secret Over complete graph with n nodes, nC2 = n(n-1)/2 pairs secret keys are required.…

History Elementary Number Theory RSA DH ECC Others * Key management Keep private key in secret Over complete graph with n nodes, nC2 = n(n-1)/2 pairs secret keys are required.…

Cryptography Reference: Network Security PRIVATE Communication in a PUBLIC World. by Kaufman, Perlman & Speciner. Netprog: Cryptgraphy Secret Key Cryptography Single…

Network Security Continued Digital Signature You want to sign a document. Three conditions. 1. The receiver can verify the identity of the sender. 2. The sender cannot later…

COEN 351 E-Commerce Security Essentials of Cryptography Cryptography Scrambles a plain-text into crypto-text. Enables to descramble plain text. Symmetric Cryptography Uses…