cifer binary package in Ubuntu Xenial amd64

 Cifer provides many functions designed to aid in cracking classical
 ciphers; a group of ciphers used historically, but which have now
 fallen into disuse because of their suceptability to ciphertext-only
 attacks. In general, they were designed and implemented by hand, and
 operate on an alphabet of letters (such as [A-Z]).
 .
 It operates using text files as input and output, and can perform both brute
 force and other, more sophisticated, attacks against many classic encryption
 schemes. In addition, it provides many utilities such as frequency analysis
 and automated encryption/decryption of texts.

Source package