Substitution boxes - PowerPoint PPT Presentation

Encryption - I

Encryption - I. Definitions. Plaintext: easy to understand form (original message) Ciphertext: difficult to understand form Encryption: encoding (plaintext -&gt; ciphertext) Decryption: decoding (ciphertext -&gt; plaintext) Cryptology: study of encryption Cryptography: use of encryption

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CS363

Week 3 - Monday. CS363. Last time. What did we talk about last time? Secure encryption DES. Questions?. Assignment 1. Security Presentation. Yuki Gage. DES. DES internals. DES has 16 rounds The book calls them cycles

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Questions for Discussion

Questions for Discussion. Do you enjoy teaching writing? Why? Why not? What type of writing activities do you do with your students?. Controlled writing Guided writing Free writing. Examples of controlled writing tasks. Jigsaw sentences Copying with corrections

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