Background of SAFER+
SAFER+ is based on the existing SAFER family of ciphers, which comprises the ciphers SAFER k-64, SAFER K-128, SAFER SK-64, SAFER SK-128, and SAFER SK-40.
The name SAFER was originally chosen by Prof. Massey as an acronym for Secure And Fast Encryption Routine.
SAFER+ provides for a block size of 128 bits for the plaintext and ciphertext and accommodates three different user-selected-key lengths, namely 128, 192 and 256 bits.