Module 10: Cryptography

Flashcards covering key concepts and definitions from Module 10 on Cryptography.

Cryptography

The process of making and using codes to secure information.

Cryptanalysis

The process of obtaining the plaintext message from a ciphertext message without knowing the keys used to perform the encryption.

Substitution Cipher

A cipher that substitutes or exchanges one value for another.

Transposition Cipher

A permutation cipher that involves rearranging the values within a block based on an established pattern.

XOR (Exclusive OR)

A Boolean algebra function used in encryption to compare bits, resulting in binary 0 if they are identical and binary 1 if they are not.

Public-Key Infrastructure (PKI)

An integrated system of software, encryption methodologies, protocols, and services enabling secure user communication.

Digital Signatures

Encrypted messages that provide nonrepudiation and verify that a message was sent by the sender.

Hash Functions

Mathematical algorithms that create a message summary or digest to confirm message identity and integrity.

Symmetric Encryption

A cryptographic method using the same algorithm and secret key for both enciphering and deciphering the message.

Asymmetric Encryption

A cryptographic method that uses two different keys for encryption and decryption.