🚀 go-pugleaf

In article <C1Ho7r.J1M@eis.calstate.edu>, ribarbe@eis.calstate.edu (Richard Eldon Barber) writes:
> This system has an option:
>         %, ^X   Toggle rot-13 decoding for this article
> when viewing a piece of news.  Is this encryption?  Are there programs
> available for macintosh or pc's to encode?
> email ribarbe@eis.calstate.edu
> ---rick

	ROT-13 encryption, is encryption, but it is designed to be secure against
people not wanting to read the encrypted message. (i.e. NOT secure)

Here is a small c-source that reads from standard input and writes the encrypted
text to standard out. Note the cipher is symmetrical and the same routine will
thus encipher and decipher a text

examples of usagege (UNIX)

%rot <infile >outfile
%

The source should be easy to modify, so it will work under other modes of
operation.

----------------------------------------------------
#include<stdio.h>

main()
{
char ch;
int i;

while(1) {
   ch=getchar();
   if (ch==EOF) return(0);
   if (islower(ch)) {
      i=(int)ch;
      i=i+13;
      if (i>122) i=i-26;
      ch=(char)i;
      }
   if (isupper(ch)) {
      ch=ch+13;
      if (ch>'Z') ch=ch-26;
      }
   putchar(ch);
   }
}
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