I have implemented a version of the core of the DES algorithm for the HP 48SX calculator; I mentioned this in passing on this list a couple of weeks ago. Anyhow, in the general cypherpunks spirit of things, I'm willing to share this code... Note that this only ECB-mode encryption and key schedule computation, and not decryption. Both operations take about 12 seconds.. mostly because they're written in user RPL rather than system RPL or machine code. If the person at Berkeley who maintains the cypherpunks FTP archive wants to get in touch with me, I'd be happy to contribute this file to the archive; also, I'll mail it to anyone with a US or Canadian email return address. - Bill