[4187] in cryptography@c2.net mail archive
Re: Strengthening the Passphrase Model
daemon@ATHENA.MIT.EDU (David R. Conrad)
Wed Feb 10 16:35:25 1999
Date: Wed, 10 Feb 1999 16:31:26 -0500 (EST)
From: "David R. Conrad" <drc@adni.net>
To: cryptography@c2.net
Cc: coderpunks@toad.com
In-Reply-To: <v03130302b2e5f5da6f4e@[24.128.119.92]>
[My problem with this is that the source of entropy is particularly
bad... --Perry]
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. :-)
Coderpunks 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
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