70. Symmetric Algorithms

Remmeber to make a flashcard set for which are block and which are stream

Symmetric Algorithm

Method of encryption where the same key is used for both encryption and decryption of data

Most commonly used symmetric algorithms

DES

3DES

IDEA

AES

Blowfish

Twofish

Rivest Ciphers (RC4)

Rivest Ciphers (RC5)

Rivest Ciphers (RC6)

DES

Data Encryption Standard

Data Encryption Standard

Encryption algorithm which breaks the input into 64-bit blocks and uses transposition and substitution to create ciphertext using an effective key strength of only 56-bits

3DES

Triple DES

Triple DES

Encryption algorithm which uses three separate symmetric keys to encrypt, decrypt, then encrypt the plaintext into ciphertext in order to increase the strength of DES

IDEA

International Data Encryption Algorithm

International Data Encryption Algorithm

Symmetric block cipher, which uses 64-bit blocks to encrypt plaintext into ciphertext

AES

Advanced Encryption Standard

Advanced Encryption Standard

Symmetric block cipher that uses 128-bit, 192-bit, or 256-bit blocks and a matching encryption key size to encrypt plaintext into ciphertext

Blowfish

Symmetric block cipher that uses 64-bit blocks and a variable length encryption key to encrypt plaintext into ciphertext

Twofish

PRovides he ability to use 128-bit blocks in its encryption algorithm and uses 128-bit, 192-bit, or 256-bit encryption keys

RC Cipher Suite

Created by Ron Rivest, a cryptographer who's created six algorithms under the name RC, which stands for the Rivest Cipher

Rivest Ciphers (RC4)

Symmetric stream cipher using a variable key size from 40-bits to 2048-bits that is used in SSL and WEP

Rivest Ciphers (RC5)

Symmetric block cipher that uses key sizes up to 2048-bits

Rivest Ciphers (RC6)

Symmetric block cipher that was introduced as a replacement for DES but AES was chosen instead