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gistfile1.rb

require 'openssl'

ARGV.each do|a, index|
    data = File.open(a, 'r:ASCII-8BIT').read
    c = OpenSSL::Cipher.new('AES-128-ECB')
    c.decrypt
    c.key = 'M02cnQ51Ji97vwT4'
    o = ''.force_encoding('ASCII-8BIT')
    data.bytes.each_slice(16) { |s| o += c.update(s.map(&:chr).join) }
    o += c.final
    File.open('decyphered_' + a , 'w') { |f| f.write(o) }
end