Bug #90836 for Crypt-Solitaire: Crypt::Solitaire v2.0 seems to just be doing a Caesar shift

Crypt::Solitaire (v2.0, Perl v5.14.2, Ubuntu 12.04) seems to just be doing a Caeser shift; no matter what key I specify it just does a 20 character rotation, (or 6 for decryption, i.e. rot13 with an offset of 7): $ caesar 20 hello byffi $ caesar 6 byffi hello $ perl -e 'use Crypt::Solitaire; print( Crypt::Solitaire::Pontifex( "hello", "abcde", "e") );' BYFFI $ perl -e 'use Crypt::Solitaire; print( Crypt::Solitaire::Pontifex( "byffi", "abcde", "d") );' HELLO I'm not intimately familiar with Solitaire / Pontifex, but I know it's is more elaborate than a Caesar shift... am I invoking the call incorrectly? Perhaps the module falls back on a Caesar shift in case of some error? There's a website that does solitaire/pontifex encryption and it reckons "hello" encrypted with key "abcde" should result in the ciphertext "NYFPA", not "BYFFI". See http://www.arsitech.com/cgi/pontifex.pl .