DES, IDEA, RC4, AES)
Hashing for integrity (MD4, MD5, RIPEMD, SHA-1, SHA-2)
Asymmetric for authentication (RSA, El Gamal, ECC elliptic curve crypto)
Non-Repudiation is Asymmetric plus Hashing – condition where a message is a hash encrypted with the sender’s private key
Relationship of Encryption to Incidents and Threats
Elements needed for Encryption and Encryption Methods
Symmetric Encryption Systems
DES (Data Encryption Standard)
DES is a block encryption algorithm using 64-bit blocks. It uses a 64 bit key 56 bits of true key and 8 for parity. Characters are put through 16 rounds of transposition and substitution.
Devised in 1972 as a derivation of the “Lucifer” system
DES Describes the DEA (Data Encryption Algorithm)
FIPS PUB 46-1 (1977) and ANSI X3.92 (1981)
64bit blocks, 56-bit key and
16 rounds of transformation
Uses confusion and diffusion for encrypting plain text.
Confusion Conceals statistical connection between ciphertext and plaintext. Uses non-linear substitution boxes (S-Boxes)
Diffusion Spreads the influence of a plain text character over many ciphertext characters.
DES has 4 distinct modes of operation

Whether you're preparing for Cybersecurity certification, working with government standards, or simply starting your career in compliance, these are the NIST Federal Information Processing Standards (FIPS), Special Publication (SP), and Interagency Report (IR) topics