Created
May 1, 2014 12:13
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XOR cipher
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# Гаммирование | |
class String | |
def ^( other ) | |
b1 = self.unpack("U*") | |
b2 = other.unpack("U*") | |
longest = [b1.length,b2.length].max | |
b1 = [0]*(longest-b1.length) + b1 | |
b2 = [0]*(longest-b2.length) + b2 | |
b1.zip(b2).map{ |a,b| a^b }.pack("U*") | |
end | |
def xor(key) | |
text = dup | |
text.length.times {|n| text[n] ^= key[n] } | |
text | |
end | |
end | |
puts "Метод гаммирования" | |
print "Введите исходный текст: " | |
text = gets | |
print "\nВведите ключевое слово: " | |
keyword = gets | |
text.gsub!(/\s+/, '') | |
keyword.chomp! | |
if keyword.size < text.size | |
ta = text.scan(/.{#{keyword.size}}/) | |
else | |
ta = [] | |
while text.size < keyword.size | |
text << '-' | |
end | |
ta.push(text) | |
end | |
print "\n ta = #{ta}; keyword = #{keyword} \n" | |
res = "" | |
ta.each do |v| | |
# r = v ^ keyword | |
r = v.xor(keyword) | |
p r | |
res << r | |
end | |
puts "Зашифрованное сообщение: " | |
p res | |
puts "\nРасшифровка: \n" | |
it = res.xor(text) | |
rr = res.xor(it) | |
puts "Ключ: " | |
p it | |
puts "Исходное сообщение: " | |
p rr |
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