I used to have this C source that I could embed in a program, and it would tell me if the software had been tampered with at runtime. I've lost/mislaid/whatever the source, and I was wondering if anyone had anything that would do the same thing. As I recall, it calculated a simple CRC and embedded it into the .EXE file (it was written for MS-DOS). It doesn't need to be cryptographically secure - I just need to check to see if the executable has been corrupted. I've leafed through alt.sources and comp.sources.*. Thanks in advance... -- Ed Carp, N7EKG Ed.Carp@linux.org, ecarp@netcom.com 214/993-3935 voicemail/digital pager Finger ecarp@netcom.com for PGP 2.5 public key an88744@anon.penet.fi "Past the wounds of childhood, past the fallen dreams and the broken families, through the hurt and the loss and the agony only the night ever hears, is a waiting soul. Patient, permanent, abundant, it opens its infinite heart and asks only one thing of you ... 'Remember who it is you really are.'" -- "Losing Your Mind", Karen Alexander and Rick Boyes