Whilst this obfuscation did not produce the described output on my system (Mac OS X 10.3.3 with standard shipping build of perl 5.8.1RC3), I would note that bit-shift encryption, whilst often a component of other ciphers, by itself is not unbreakable. This is particularly true in this implementation as the supplied code represents an symmetric cryptographic implementation necessitating the transfer of keys for decryption.