It's worth noting that despite Schneier's best efforts, the Solitaire algorithm may not be as cryptographically strong as he hoped:<p><a href="http://www.ciphergoth.org/crypto/solitaire/" rel="nofollow">http://www.ciphergoth.org/crypto/solitaire/</a><p>(there's also the potential problem that the NSA's supercomputers have grown a lot more powerful in the decade-and-a-half since Cryptonomicon was published)
Is anyone aware of any newer hand ciphers that have been produced since 1999, especially those subjected to continuous, aggressive high-speed attack throughout their design?