CompTIA Security+ Question A-71

Jane, a VPN administrator, was asked to implement an encryption cipher with a MINIMUM effective security of 128-bits. Which of the following should Jane select for the tunnel encryption?

A. Blowfish
C. SHA256

Answer: A

Blowfish is an encryption system that performs a 64-bit block cipher at very fast speeds. It is a symmetric block cipher that can use variable-length keys (from 32 bits to 448 bits). Among the alternatives listed above, it is the only cipher that can use a 128-bit key and which does provide additional security through a symmetric key.