Evolution of Linear Analysis on the SAFER+ Block Cipher

SAFER+ is a modern block cipher that was submitted as a candidate for the Advanced Encryption Standard (AES).It has various applications and is considered to be one of the most secure block ciphers.All well-known attacks, including linear and differential cryptanalysis, have been applied to SAFER+ without revealing any vulnerabilities.In this paper, we review linear cryptanalysis attacks against SAFER+ and present additional data that may be of interest for the further development of linear cryptanalysis.