Encryption or SHA - URGENT PLEASE
Dar Scott
dsc at swcp.com
Fri Jun 11 17:54:45 EDT 2004
On Jun 11, 2004, at 10:23 AM, Geoff Caplan wrote:
> We URGENTLY need a recognised 2 way encryption algorithm - has anyone
> done one please? Don't have time to do it from scratch.
On most platforms you can use the Transcript shell() function to get
you access to command-line encryption utilities such as openSSL and
gnupg.
This may require the plaintext to be in a file, unfortunately. You can
wipe a plaintext file with a utility (WipeErase, QuickWiper, flame,
burn, wipe, etc.) that writes to every used sector several times, and
in many applications, that is sufficient. It might be easier to use a
system enhancement such as autoscrubber and that might be better for
some needs--I haven't used one of these.
If you need just a simple obfuscation, then you can try building
something with the MD5 command (I have). There is some literature on
building true encryption this way.
If you do decide to build one from scratch, check on the legal status
of the RC4 trademark and make an RC4 stream cipher.
To use the openSSL command-line tool for simple encryption, see these:
http://www.openssl.org/docs/apps/openssl.html
http://www.openssl.org/docs/apps/enc.html
For example, to use RC4 to decode a file and use stdout for the
plaintext:
openssl rc4-40 -in c.rc4 -K 1234567890
Dar Scott
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