Re: Strengthening the Passphrase Model

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David R. Conrad (drc@adni.net)
Wed, 10 Feb 1999 16:31:26 -0500 (EST)


BTW, here's a simple program I use to generate passwds and/or diceware
words. For diceware, use "grep `randpwd -` diceware-list |cut -f2"

Sorry that it's a bit of an obfuscated C contest entry, but I had written
a somewhat simpler one, and then when I wrote this one I tried to keep
from making it much longer than the previous incarnation. Silly, I know.

        -=-=- randpwd.c -=-=-
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>

int main(int argc, char **argv) {
  struct timeval tv;
  char chars[] = "abcdefghijklmnopqrstuvwxyz"
                 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                 "0123456789,.;'/-=";
  int i, seed = 0, len = strlen(chars);
  FILE *fp = fopen("/dev/random", "r");
  if (fp) { fread(&seed, 1, sizeof(seed), fp); fclose(fp); }

  gettimeofday(&tv, NULL);
  srand(tv.tv_sec ^ tv.tv_usec ^ getpid() ^ seed);

  if (argc > 1) for (i = 0; i < 5; i++) printf("%d", rand()%6+1);
  else for (i = 0; i < 8; i++) printf("%c", chars[rand()%len]);

  return printf("\n")-1;
}
        -=-=- randpwd.c -=-=-

'return printf("\n")-1;', hey I said it was slightly obfuscated. :-)
CodherPlunks write cyphe, or something.

David R. Conrad <drc@adni.net> PGP keys (0x1993E1AE and 0xA0B83D31):
DSS Fingerprint20 = 9942 E27C 3966 9FB8 5058 73A4 83CE 62EF 1993 E1AE
RSA Fingerprint16 = 1D F2 F3 90 DA CA 35 5D 91 E4 09 45 95 C8 20 F1
Note: Due to frequent spam abuse, I accept no email from *.da.uu.net.


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The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:18:27