On 9/12/2012 10:42 PM, [email protected] wrote:
My rationale behind writing this simple utility is as follows: Moving data
through a fully encrypted tunnel like SSH is too slow for me, so I use
netcat/socat for moving large chunks of data between systems. I don't want the
data to be easily identified and reproduced if it is somehow intercepted, though
it's also not a major problem if someone goes through the trouble of decrypting
it; thus, simple XOR encryption is good enough for my purposes and is also
extremely fast. I'm sure someone else will find it useful, and given its
minuscule size, it is of negligible cost to include.
I apologize for further sidetracking the conversation, but if I were
going to write a quick-n-dirty encryption tool I would pick a 32-bit int
and then XOR with a pseudo-random sequence generated from it. That would
at least give the attacker a mental challenge (unless they knew the
first 4 bytes of the data...) Maybe also add a salt parameter?
while (more_data) {
data[i]= data[i] ^ key ^ salt;
key= key * a + c;
}
(http://en.wikipedia.org/wiki/Linear_congruential_generator)
Integer multiplication is pretty cheap on most hardware.
-Mike
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