Generate a high entropy, memorable password.
$ rpgen --help
$ rpgen
The output is of the format <password> <dictionaryEntropy> <characterEntropy>; see Security for notes on entropy.
stacking-patty-divergent-tiresome-deviants 80 199
It's more memorable than yIRXLbae6ixc0BXXtYxG.
Random words are selected using a cryptographically secure random number generator derived from
Node.js's crypto.randomBytes. This generator is tested, as described below.
A password's information entropy quantifies its resistance to brute-force attacks. For example, it would take up to 2e80 ~ 1.2e+24 attempts to guess a password with 80 bits of entropy.
entropy = log2( number-of-possible-symbols ^ { number-of-symbols-used } )
The character entropy is the entropy of the password when a 'naive' attack is carried out; that is, if the password is 100 characters long the attacker is brute-forcing all combinations of 100 characters. This is a reasonable assumption for many brute-force attacks, especially if you use a private input dictionary rather than the stock one supplied with this tool.
The second included entropy, the dictionary entropy, is the entropy of the password when each combination of words is brute-forced. This entropy will be much lower, but under this view the password should still be secure.
rpgen passes the superficial but important "random-bitmap" test:
for comparison, PHPs rand( ) does not
rpgen was also tested against 100,000,000 (1.1Gb) random integers.
- Granted snapcraft access to home file reads, fixing some issues with custom rpgen dictionaries
- Added many examples, as requested by a displeased user. Every operation
rpgencan perform is now documented - Removed stdin support, since it didn't work with snapcraft and is essentially unneeded given file-parameter arguments
- Fixed support for standard input; running
rpgen -now behaves as expected - Rpgen now uses a default english-langugage dictionary. Running
rpgen -g englishwas not an intuitive workflow. Language patches are welcome to support other languages!
The MIT License
Copyright (c) 2020 Róisín Grannell
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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