Data Encryption Standard (DES) is a cryptographic block cipher algorithm.
RSA is a common public key algorithm, which can be used for encryption and signature
"By comparison des see section 3.2 and other block ciphers are much faster than the rsa algorithm"
from question "Big-O Notation: Encryption Algorithms"
"Des code is 8 times larger than rsa"
from question "How can I translate printf("%c",M); from C to Java for my DES implementation?"