Cryptographic Algorithms and Protocols

cryptographicAlgorithms

Name	Type	Algorithm Method	Key Size	Strength	Replaced By
DES	Symmetric	64-bit block cipher	64 bit (56 + 8 parity) 56-bit encryption keys	Very weak	3DES
3DES	Symmetric	64-bit block cipher	192 bit (168 bit + 24 parity)	Moderate	AES
Blowfish	Symmetric	64-bit block cipher	32- to 448-bit key
AES	Symmetric	128-bit block cipher	128-bit encryption keys 192-bit encryption keys 256-bit encryption keys	Strong	N/A
Twofish	Symmetric	128-bit block cipher	128-, 192-, or 256-bit key
RC4 – Rivest Cipher 4	Symmetric	Stream mode cipher (one bit at a time)	40- to 2,048-bit key
RC5	Symmetric	Block mode cipher	Variable (up to 2048)	Very Strong	N/A
RSA	Asymmetric	Key transport	1024-bit keys	Strong	N/A
Diffie-Hellman	Asymmetric	Key exchange	N/A	Moderate	El Gamal
El Gamal	Asymmetric	Key exchange	N/A	Very Strong	N/A
MD5	Hashing – Integrity	Rivest MD5 Block Hash	512 bit block processing Creates 128-bit hashes / digest	Strong	MD6, et. Al.
SHA-1	Hashing – Integrity	Rivest SHA Hash	512-bit processing Creates 160-bit hashes / digest	Very Strong	N/A
SHA-2	Hashing – Integrity	Hash	Creates 224-, 256-, 384-, or 512-bit hashes
HMAC-MD5	Integrity -Authenticity	Keyed Digest	Creates 128-bit hashes	Very Strong	N/A
HMAC-SHA1	Integrity – Authenticity		Creates 160-bit hashes
RIPEMD	Hash		Creates 128-, 160-, 256-, or 320-bit hashes