fixedXOR

def fixedXOR s,k
    result = ""
    s.chars.zip(k.chars).each do |c,d|
        q = c.hex ^ d.hex;
        result += q.to_s(16)
    end
    puts result
end

fixedXOR("1c0111001f010100061a024b53535009181c","686974207468652062756c6c277320657965");