(from http://www.memestreams.net/thread/bid7273/ )

] Looks like if I want an online double-key Vigenere decoder,
] I'm going to have to write one... Stay tuned.

Okay, I wrote a Vigenere table-builder (in Flash MX Actionscript) that'll handle English and Cyrillic alphabets. I also included the keys needed to build the tables that appear on the Kryptos and Cyrillic Projector sculptures, along with the keys to solve parts 1 and 2 of the Kryptos code.

The utility *doesn't* do automatic encoding/decoding (yet), but will eventually. In the meantime, it's useful (IMHO) as a timesaver to build the tables, or a teaching device to understand how the tables are put together.

Vigenere Table Builder