Rot13 Program.

Recently I found a XOR encryption program. Upon deciding that XOR sucks, I decided to adapt it to the almighty ROT13! :) Well, I'm pretty sure my program complies to the ROT13 rule and I was wondering if any of you dudes would check it out for me and see if it is.

Here's the source code and attached is a zip file with the source code and the actual program itself (compiled)

Code:

---

/* ROT13 by Jethro
  1337 3ncrypt10n! :)
  [email protected]
*/

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
  int count;
  FILE *in,*out;

  if(argc < 3) {
    printf("ROT13 by Jethro\n");
    printf("Usage: rot13 <source file> <destination file>");
    return 0;
}

in = fopen(argv[1], "rb");
out = fopen(argv[2], "wb");

while(( count = getc(in)) != EOF)
{
count = count ^ 13;
putc(count, out);
}
return 0;
}

---

Thanks!

Eht,-Cdnh-hcnt}ydbc!-`ltoh-D-~ebxai-`lfh-bch-bk-`t-bzc-~b-yeh-il`c-jb{*cy-nlcy-hli-`t-h`lda~#####-Leee!-Yehti-nlnf-dy-dc-lobxy-elak-l-~hnbci-lctzlt-7]

Hmmm, Do you have a decoder? Or do I just use the same program backwards.....

Just making sure that the desired effect was actually ROT13 and not some other crazy thing. Isn't it <camp>super</camp> :)?

Quote:

---

Originally posted here by ac1dsp3ctrum
Eht,-Cdnh-hcnt}ydbc!-`ltoh-D-~ebxai-`lfh-bch-bk-`t-bzc-~b-yeh-il`c-jb{*cy-nlcy-hli-`t-h`lda~#####-Leee!-Yehti-nlnf-dy-dc-lobxy-elak-l-~hnbci-lctzlt-7]

Hmmm, Do you have a decoder? Or do I just use the same program backwards.....

---

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And YOU can have this guaranteed uncrackable* encryption for only 3 easy payments of 500million $

* Not a guarantee
</advertisement>

/me hands jethro the advert whore trophy :D

Well, I don't wanna be excused of somehow over-selling my program, but if the Nazis had used ROT13 instead of the Enigma yolk, you'd all be singing a different anthem! It's uncrackable!

I thought ROT13 was taking a number of the alphabet (1=a 2=b.....ie). adding 13 to the number mod 26? Thus XORing the letter by 13 is not ROT13, also XORing the value by 13 is EXTREMELY breakable..:) And the answer to someone's question is that this program applied on a ciphertext will result in the plaintext..:)

I also think, that rot13 in a computer context is simply adding 13 to the ASCII code of a letter and being careful that you roll over when the value crosses the upper boundry (i.e. 122 dec / 90 dec, excluding numbers).

have fun!

shr1k3

Heey, you have forgotten the most obvious tester thingie... AntiOnline's own! http://www.antionline.com/tools-and-toys/encrypt-text/
If ac1dsp3ctrum got his strange series of characters out of your prog, I think it doesn't work, because that's
Rug,-Pqau-upag}lqop!-`ygbu-Q-~roknv-`ysu-opu-ox-`g-omp-~o-lru-vy`p-wo{*pl-aypl-uyv-`g-u`yqn~#####-Yrrr!-Lrugv-ayas-ql-qp-ybokl-rynx-y-~uaopv-ypgmyg-7]
if encrypted. I assume ac1dsp3ctrum gave it some smart input?-)

Hmm, so whatever the program does, it isn't ROT13. Maybe I have stumbled across the most advanced algorhythm... :). Are you sure that it isn't ROT13?

If it's uncrackable, then it can't be ROT13...