Crypt::CFB - Encrypt Data in Cipher Feedback Mode use Crypt::CFB; my $cipher = new Crypt::CFB $key, 'Crypt::Rijndael'; my $ciphertext = $cipher->encrypt($plaintext); my $plaintext = $cipher->decrypt($ciphertext); Pure Perl implementation of Cipher Feedback Mode for almost arbitrary block ciphers and cryptographic hash functions.