Вы можете использовать OpenSSL :: Cypher
# for more info, see http://ruby-doc.org/stdlib-1.9.3/libdoc/openssl/rdoc/OpenSSL/Cipher.html
require 'openssl'
require 'digest/sha1'
# create the cipher for encrypting
cipher = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
cipher.encrypt
# you will need to store these for later, in order to decrypt your data
key = Digest::SHA1.hexdigest("yourpass")
iv = cipher.random_iv
# load them into the cipher
cipher.key = key
cipher.iv = iv
# encrypt the message
encrypted = cipher.update('This is a secure message, meet at the clock-tower at dawn.')
encrypted << cipher.final
puts "encrypted: #{encrypted}\n"
# now we create a sipher for decrypting
cipher = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
cipher.decrypt
cipher.key = key
cipher.iv = iv
# and decrypt it
decrypted = cipher.update(encrypted)
decrypted << cipher.final
puts "decrypted: #{decrypted}\n"
Но промежуточная форма плохо подходит для печати
Учитывая вашу мысль, что было бы неплохо, если бы промежуточная форма была такой же длины, вы могли бы просто использовать простую карту одного символа в другой.
ПОЖАЛУЙСТА, ПОНИМАЙТЕ, ЧТО ЭТО НЕ НАДЕЖНО
Вы можете легко грубым нажатием клавиши, но, похоже, она соответствует вашим требованиям.
class Cipher
def initialize(shuffled)
normal = ('a'..'z').to_a + ('A'..'Z').to_a + ('0'..'9').to_a + [' ']
@map = normal.zip(shuffled).inject(:encrypt => {} , :decrypt => {}) do |hash,(a,b)|
hash[:encrypt][a] = b
hash[:decrypt][b] = a
hash
end
end
def encrypt(str)
str.split(//).map { |char| @map[:encrypt][char] }.join
end
def decrypt(str)
str.split(//).map { |char| @map[:decrypt][char] }.join
end
end
# pass the shuffled version to the cipher
cipher = Cipher.new ["K", "D", "w", "X", "H", "3", "e", "1", "S", "B", "g", "a", "y", "v", "I", "6", "u", "W", "C", "0", "9", "b", "z", "T", "A", "q", "U", "4", "O", "o", "E", "N", "r", "n", "m", "d", "k", "x", "P", "t", "R", "s", "J", "L", "f", "h", "Z", "j", "Y", "5", "7", "l", "p", "c", "2", "8", "M", "V", "G", "i", " ", "Q", "F"]
msg = "howdy pardner"
crypted = cipher.encrypt msg
crypted # => "1IzXAF6KWXvHW"
decrypted = cipher.decrypt crypted
decrypted # => "howdy pardner"