Encryption and Decryption

Transposition cipher

Anagrams

Frequency Analysis

Comparing occurrence of characters to the relative frequency use of characters in an alphabet

Computational Security

Concept of how secure data encryption is

Plaintext

Data in human, readable form

Decryption

Deciphering encrypted data

Computational Hardness

Degree of difficulty in cracking a cipher

Ciphertext

Encrypted data

Baudot Code

Five digit character code predating ASCII and Unicode

One-time Pad

Key used only once to encrypt and decrypt a message, then it is discarded

Substitution cipher

One character of the plaintext is substituted for another, general.

Caesar Cipher

One character of the plaintext is substituted for another, specific

Encrypted

State of data when in transmission

Decrypted

State of data when received

Encryption

Turning plaintext into scrambled ciphertext

Vernam Cipher

Uses a one-time pad (key) to create ciphertext. Mathematically impossible to decrypt without the key

Polyalphabetic

Using multiple alphabet, layering