Defense in Depth - strategy of using many layers of varying security mechanisms to frustrate attackers.
Cryptography - "Secret writing"
Cipher - an algorithm that converts plain text to into ciphertext.
Encryption - process of making text secret
Decryption - reverse process
Replace every letter in a message with somthing else according to a translation.
By the 1990's, cryptography was mechanized in the form of encryption machines
With the advent of computers, cryptography moved from hardware into software.
Data Encryption Standard - developed by IBM and the NSA in 1977.
In 2001, the Advanced Encryption Standard was finalized and published.
An algorithm that lets computers agree on a key without ever sending one.
There are two different keys - often public and private key.
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