Module 7: Encryption Algorithms

These flashcards cover the key vocabulary and concepts from the lecture on encryption algorithms, focusing on both classical and modern encryption techniques.

Encryption

The process of converting information or data into a code to prevent unauthorized access.

Decryption

The process of converting encoded data back into its original form.

Classical Ciphers

Ciphers that work only on text and include methods such as substitution and permutation.

Substitution Cipher

A cipher where each character in the plaintext is replaced by another character.

Permutation Cipher

A cipher that rearranges the characters in the plaintext to create the ciphertext.

Caesar Cipher

A type of substitution cipher that shifts characters a fixed number of places down the alphabet.

Symmetric Ciphers

Ciphers that use the same key for both encryption and decryption.

Asymmetric Ciphers

Ciphers that use a pair of keys, a public key and a private key, for encryption and decryption.

Public-key Cryptography

A cryptographic system that uses pairs of keys; one public and one private.

SSL (Secure Sockets Layer)

A standard security technology for establishing an encrypted link between a server and a client.

HTTPS

An extension of HTTP that utilizes SSL to secure communication over a computer network.