Evaluation of Security Level of Cryptography: RSA Signature Schemes (PKCS#1 v1.5, ANSI X9.31, ISO 9796) Alfred Menezes University of Waterloo Contact: ajmeneze@uwaterloo.ca July 31, 2002 Contents Page 1 Contents 1 2 3 Executive Summary Introduction Multiplicative Property of RSA.
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Outline Cryptography Traditional cryptography Statistical attacks Secret-key encryption Public-key encryption encrypt ciphertext plaintext 6/8/2002 2:08 PM Cryptography 1 6/8/2002 2:08 PM Cryptography 2 Encryption Scenario: wants to send a message (plaintext p) to Bob. The communication channel is insecure and can be eavesdropped If Alice and Bob have previously agreed on an encryption scheme (cipher), the message can be sent encrypted (ciphertext c) Alice Traditional Cryptography Ciphers were already studied in ancient times Caesars cipher: replace replace replace a with d b with e z with c Issues: is a good encryption scheme? What is the complexity of encrypting/decrypting?
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Cryptography is a method of storing and transmitting data in a form that only those it is intended for can read and process. It is a science of protecting information by encoding it into an unreadable format. Cryptography is an effective way of protecting sensitive information as it is stored on media or transmitted through network communication paths.
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