Aren't CRC algorithms easy to reverse? Sorry for the sloppy terminology. Obviously this has to be a cryptographic hash, not just a crc. But I still think performance will not be a huge issue. dumaguete# ls -l /bsd -rwxr-xr-x 1 rees wheel 2172784 Jan 25 16:11 /bsd dumaguete# time md5 /bsd MD5 (/bsd) = c0f5740842c563d820906a318461d1e4 0.2u 0.0s 0:00.76 31.5% 0+0k 49+2io 13pf+0w *************************************************************** Linux Smart Card Developers - M.U.S.C.L.E. (Movement for the Use of Smart Cards in a Linux Environment) http://www.linuxnet.com/smartcard/index.html ***************************************************************
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