Random password generator

A random password generator is software program or hardware device that takes input from a random or pseudo-random number generator and automatically generates a password. Random passwords can be generated manually, using simple sources of randomness such as dice or coins, or they can be generated using a computer.

While there are many examples of "random" password generator programs available on the Internet, generating randomness can be tricky and many programs do not generate random characters in a way that ensures strong security. A common recommendation is to use open source security tools where possible, since they allow independent checks on the quality of the methods used. Note that simply generating a password at random does not ensure the password is a strong password, because it is possible, although highly unlikely, to generate an easily guessed or cracked password.

A password generator can be part of a password manager. When a password policy enforces complex rules, it can be easier to use a password generator based on that set of rules than to manually create passwords.

The naive approach

Here are two code samples that a programmer who is not familiar with the limitations of the random number generators in standard programming libraries might implement:

C

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
 
int
main(void)
{
    /* Length of the password */
    unsigned short int length = 8;
 
    /* Seed number for rand() */
    srand((unsigned int) time(0) + getpid());
 
    /* ASCII characters 33 to 126 */
    while(length--) {
        putchar(rand() % 94 + 33);
        srand(rand());
    }
 
    printf("\n");
 
    return EXIT_SUCCESS;
}

In this case, the standard C function rand, which is a pseudo-random number generator, is initially seeded using the C functions time and getpid, but later iterations use rand instead. According to the ANSI C standard, time returns a value of ftype time_t, which is implementation defined, but most commonly a 32-bit integer containing the current number of seconds since January 1, 1970 (see: Unix time), and getpid returns a pid t. There are about 31 million seconds in a year, so an attacker who knows the year (a simple matter in situations where frequent password changes are mandated by password policy) and the process ID that the password was generated with, faces a relatively small number, by cryptographic standards, of choices to test. If the attacker knows more accurately when the password was generated, he faces an even smaller number of candidates to test – a serious flaw in this implementation.

In situations where the attacker can obtain an encrypted version of the password, such testing can be performed rapidly enough so that a few million trial passwords can be checked in a matter of seconds. See: password cracking.

The function rand presents another problem. All pseudo-random number generators have an internal memory or state. The size of that state determines the maximum number of different values it can produce: an n-bit state can produce at most 2ⁿ different values. On many systems rand has a 31 or 32 bit state, which is already a significant security limitation. Microsoft documentation does not describe the internal state of the Visual C++ implementation of the C standard library rand, but it has only 32767 possible outputs (15 bits) per call. [1] Microsoft recommends a different, more secure function, rand_s, be used instead. The output of rand_s is cryptographically secure, according to Microsoft, and it does not use the seed loaded by the srand function. However its programming interface differs from rand. [2]

PHP

function pass_gen($length = 8) {
    $pass = '';
    srand((float) microtime() * 10000000);
    for ($i = 0; $i < $length; $i++) {
        $pass .= chr(rand(32, 126));
    }
    return $pass;
}

In the second case, the PHP function microtime is used, which returns the current Unix timestamp with microseconds. This increases the number of possibilities, but someone with a good guess of when the password was generated, for example the date an employee started work, still has a reasonably small search space. Also some operating systems do not provide time to microsecond resolution, sharply reducing the number of choices. Finally the rand function usually uses the underlying C rand function, and may have a small state space, depending on how it is implemented. An alternative random number generator, mt_rand, which is based on the Mersenne Twister pseudorandom number generator, is available in PHP, but it also has a 32-bit state. There are proposals for adding strong random number generation to PHP. [3]

Stronger methods

A variety of methods exist for generating strong, cryptographically secure random passwords. On Unix platforms /dev/random and /dev/urandom are commonly used, either programmatically or in conjunction with a program such as makepasswd . The Java programming language includes a class called SecureRandom. Windows programmers can use the Cryptographic Application Programming Interface function CryptGenRandom. Another possibility is to derive randomness by measuring some external phenomenon, such as timing user keyboard input.

These methods should prove adequate for most password generation needs, but their suitability will vary depending on the specific situation.

Bash

Here is a code sample that uses /dev/urandom to generate a password with a simple Bash function. This function takes password length as a parameter, or uses 8 by default:

function mkpw() { head /dev/urandom | uuencode -m - | sed -n 2p | cut -c1-${1:-8}; }

Note that while /dev/urandom should be appropriate for most needs, it is not suitable for long term cryptographic keys or where an especially high level of security is required. In the case of the latter, a method employing /dev/random should be used .

Python

The language Python includes a SystemRandom class that obtains cryptographic grade random bits from /dev/urandom on a Unix-like system, including Linux and Mac OS X, while on Windows it uses CryptGenRandom. Here is a simple Python 2 script that demonstrates the use of this class:

#!/usr/bin/python
import random, string
myrg = random.SystemRandom()
length = 10
# If you want non-English characters, remove the [0:52]
alphabet = string.letters[0:52] + string.digits
pw = str().join(myrg.choice(alphabet) for _ in range(length))
print pw

PHP

A PHP program can open and read from /dev/urandom, if available, or invoke the Microsoft utilities. A third option, if OpenSSL is available is to employ the function openssl_random_pseudo_bytes'.'

Mechanical methods

Yet another method is to use physical devices such as dice to generate the randomness. One simple way to do this uses a 6 by 6 table of characters. The first die roll selects a row in the table and the second a column. So, for example, a roll of 2 followed by a roll of 4 would select the letter "j" from the table below. To generate upper/lower case characters or some symbols a coin flip can be used, heads capital, tails lower case. If a digit was selected in the dice rolls, a heads coin flip might select the symbol above it on a standard keyboard, such as the '$' above the '4' instead of '4'.

	1	2	3	4	5	6
1	a	b	c	d	e	f
2	g	h	i	j	k	l
3	m	n	o	p	q	r
4	s	t	u	v	w	x
5	y	z	0	1	2	3
6	4	5	6	7	8	9

Type and strength of password generated

Random password generators normally output a string of symbols of specified length. These can be individual characters from some character set, syllables designed to form pronounceable passwords, or words from some word list to form a passphrase. The program can be customized to ensure the resulting password complies with the local password policy, say by always producing a mix of letters, numbers and special characters.

The Password strength of a random password against a particular attack (brute-force search), can be calculated by computing the information entropy of the random process that produced it. If each symbol in the password is produced independently and with uniform probability, the entropy in bits is given by the formula

$H = L\log_2 N = L {\log N \over \log 2}$

where N is the number of possible symbols and L is the number of symbols in the password. The function log₂ is the base-2 logarithm. H is typically measured in bits.

Entropy per symbol for different symbol sets

Symbol set	Symbol count N	Entropy per symbol H
Arabic numerals (0-9) (e.g. PIN)	10	3.32 bits
Hexadecimal numerals (0-9, A-F) (e.g. WEP key)	16	4.00 bits
Case insensitive Latin alphabet (a-z or A-Z)	26	4.70 bits
Case insensitive alphanumeric (a-z or A-Z, 0-9)	36	5.17 bits
Case sensitive Latin alphabet (a-z, A-Z)	52	5.70 bits
Case sensitive alphanumeric (a-z, A-Z, 0-9)	62	5.95 bits
All ASCII printable characters	94	6.55 bits
Diceware word list	7776	12.9 bits

Minimum lengths L of randomly generated passwords to achieve desired password entropy H for symbol sets containing N symbols.

Desired password entropy H	Arabic numerals	Case insensitive Latin alphabet	Case insensitive alphanumeric	Case sensitive Latin alphabet	Case sensitive alphanumeric	All ASCII printable characters
32 bits	10	7	7	6	6	5
40 bits	13	9	8	8	7	7
64 bits	20	14	13	12	11	10
96 bits	29	21	19	17	17	15
128 bits	39	28	25	23	22	20
160 bits	49	35	31	29	27	25
192 bits	58	41	38	34	33	30
224 bits	68	48	44	40	38	35
256 bits	78	55	50	45	43	39
384 bits	116	82	75	68	65	59
512 bits	155	109	100	90	86	78
1024 bits	309	218	199	180	172	156

Any password generator is limited by the state space of the pseudo-random number generator used, if it is based on one. Thus a password generated using a 32-bit generator is limited to 32 bits entropy, regardless of the number of characters the password contains.

Note, however, that a different type of attack might succeed against a password evaluated as 'very strong' by the above calculation.

Password generator programs and websites

A large number of password generator programs and websites are available on the Internet. Their quality varies and can be hard to assess if there is no clear description of the source of randomness that is used, and if source code is not provided to allow claims to be checked. Furthermore, and probably most importantly, transmitting candidate passwords over the Internet raises obvious security concerns, particularly if the connection to the password generation site's program is not properly secured or if the site is compromised in some way. Without a secure channel, it is not possible to prevent eavesdropping, especially over public networks such as the Internet.

See also

• Cryptographically secure pseudorandom number generator
• Diceware
• Hardware random number generator
• Key size
• Password length parameter
• Password manager

External links

• Cryptographically Secure Random number on Windows without using CryptoAPI from MSDN
• RFC 4086 on Randomness Recommendations for Security (Replaces earlier RFC 1750.)
• Automated Password Generator standard FIPS 181
• GRC's | Password Haystacks: How Well Hidden Is Your Needle?