'Encryption rule' presentation slideshows

Classical Cryptography

Classical Cryptography. Definition A cryptosystem is a 5-tuple ( ?P , C , K , E , D ) , where the following conditions are satisfied: 1. P is a set of possible plaintext elements 2. C is a set of possible ciphertext elements

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Lecture 2 Overview

Lecture 2 Overview. Cryptography. Secret writing Disguised data cannot be read, modified, or fabricated easily Feasibility of complexity for communicating parties Encryption : encoding (encipher) plaintext ? cipher text C = E(c) (E = encryption rule) Decryption : decoding (decipher)

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??? Signature rule (HL7-J)

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