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#!/usr/bin/env ruby
ALPHABET = ('a'..'z').to_a
ALPHABET << ' '
puts ALPHABET.to_s
def mklettersubstitioncipher
cipher = {}
ALPHABET.each { |i|
while true
c = ALPHABET[ Random.rand(ALPHABET.size) ]
if not cipher.values.include? c
cipher[i] = c
break
end
end
}
return cipher
end
def encrypt(key, plaintext)
s = ''
plaintext.each_char { |i| s += key[i] }
return s
end
def decrypt(key, ciphertext)
s = ''
ciphertext.each_char { |i|
key.each_pair { |p|
if p[1] == i
s += p[0]
end
}
}
return s
end
def randomcipherstring(cipher)
length = Random.rand(49)+1
s = ''
length.times {
s += cipher[ ALPHABET[Random.rand(ALPHABET.size)] ]
}
return s
end
def sample(n, cipher)
a = []
n.times {
a << randomcipherstring(cipher)
}
puts a.to_s
end
def test
cipher = mklettersubstitioncipher
s = "das ist das haus vom nikolaus"
s_enc = encrypt(cipher, s)
s_dec = decrypt(cipher, s_enc)
puts "#{s}\n#{s_enc}\n#{s_dec}"
end
test
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