One version of MISTY appeared a couple of years ago, and it was discussed on cpunks then. Mitsubishi has had brief descriptions of it since then as the algorithm used on its LSI chip. Here are two almost identical Melco blurbs which describe the features of MISTY1 and MYSTY2: http://www.melco.co.jp/rd_home/map/j_s/topics/new/misty_e.html http://www.mitsubishi.com/ghp_japan/TechShowcase/Text/tsText06.html Note that these undated sites promise to publicize the algorithm and state that public testing of algorithms is a means of assuring their strength. Matsui, one of its authors, is a highly respected cryptographer and he's a regular participant in international crypto conferences. His articles on the ciphers underlying MISTY are listed in the IETF draft for it: http://jya.com/misty1.htm For those who wish to see the 25 draft encryption algorithms submitted to IETF in 1997 (MISTY1 the last) see a list at: http://jya.com/ietf-dea-97.htm