Module: Xkcd936

Defined in:
lib/xkcd936.rb,
lib/xkcd936/version.rb

Constant Summary collapse

VERSION = 
'0.0.2'

Class Method Summary collapse

Class Method Details

.generate_passphrase(number = 5, dict = '/usr/share/dict/words') ⇒ String

Inspired by xkcd.com/936/ But I use 5 words as default instead of 4, since 5 words will achieve an entropy of:

log(99171)/log(2)*5 = 82.988

This is enough. NIST recommends 80-bits for the most secure passwords. And it roughly needs 6 billions USD to break.

Examples:

default values

generate_passphrase

pick up four words

generate_passphrase(4)

Parameters:

  • number (Fixnum) (defaults to: 5) —

    of words

  • dict (String) (defaults to: '/usr/share/dict/words') —

    file path

Returns:

  • (String) —

    passphrase



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# File 'lib/xkcd936.rb', line 23

def generate_passphrase(number=5, dict='/usr/share/dict/words')
  pick_five = IO.readlines(dict).sample(number)
  passphrase = pick_five.map { |s| s.chomp.capitalize }.join
  # Let I18n skip validation and fall back to built in :en locale.
  # Otherwise you need to have a locale file.
  I18n.enforce_available_locales = false
  I18n.transliterate(passphrase)
end