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from C1 import encodeHexStrToRawBytes from C3 import decryptMessage, decryptWithChiSquare def readnThFile(fileName, pos): ''' read the nth line of a file, removes the '\n' characters and return the newer line ''' i = 0 with open(fileName, "r") as text: for line in text: line = line.replace('\n', '') if i == pos: return line i += 1 return line rawBytesStr = list() results = list() # read the file with the strings given to the challenge # encode it to rawBytes, decrypt it with Chi Square function #and save the result to results list bestIndex = 0 bestKey = 0 minimumResult = 0 i = 0 with open("C4_strings.txt", "r") as text: for line in text: line = line.replace('\n', '') rawBytesStr = encodeHexStrToRawBytes(line) results = decryptWithChiSquare(rawBytesStr) if i == 0: minimumResult = min(results[0], key=results[0].get) bestKey = results[1] bestIndex = i else: if minimumResult > min(results[0], key=results[0].get): minimumResult = min(results[0], key=results[0].get) bestKey = results[1] bestIndex = i i += 1 #decryptMessage(rawBytesStr, decryptWithChiSquare(rawBytesStr)[1]) string = readnThFile("C4_strings.txt", bestIndex) rawBytesStr = encodeHexStrToRawBytes(string) print(decryptMessage(rawBytesStr, bestKey))
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