Re: Stupid XOR Question

[Carl Ellison <cme@clark.net>]

>Date: Sat, 12 Aug 1995 10:05:16 -0700
>From: Anonymous User <nobody@c2.org>
>Subject: Stupid XOR Question

>ok dumb questions here.........
>
>how do i xor a simple string of plaintext?
>

In C, you open file f and

  while (((c = getc(stdin))!=EOF)&&((d = getc(f))!=EOF))
    putc(c^d, stdout) ;

If I remember correctly, Adam Back <aba@dcs.exeter.ac.uk> has a signature
block for the full C program to do this.  It's that tiny.

In a way, that program is better than RSA in 3 lines of PERL.  It's
provably unbreakable (provided the ranno source, f, is used only once and
is truly random).



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