Performance analysis of IPSec protocol: encryption and authentication

IPSec provides two types of security algorithms, symmetric encryption algorithms (e.g. Data Encryption Standard DES) for encryption, and one-way hash functions (e.g., Message Digest MD5 and Secured Hash Algorithm SHAl) for authentication. This paper presents performance analysis and comparisons between these algorithms in terms of time complexity and space complexity. Parameters considered are processing power and input size. The analysis results revealed that HMAC-MD5 can he sufficient for the authentication purposes rather than using the more complicated HMAC-SHAl algorithm. In encryption applications, authentication should he combined with DES.