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22 lines
873 B
Python
22 lines
873 B
Python
import sys
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with open("3/forstudents/b/ciphertext1.bin", "rb") as cipher1_file, open(
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"3/forstudents/b/ciphertext2.bin", "rb"
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) as cipher2_file, open("3/forstudents/b/plaintext1.txt", "r") as plain_unknown_file:
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cipher1_content = cipher1_file.read()
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cipher2_content = cipher2_file.read()
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plain_unknown_content = plain_unknown_file.read()
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possible_key = (
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int.from_bytes(cipher1_content, sys.byteorder)
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^ int.from_bytes(bytes(plain_unknown_content, "utf-8"), sys.byteorder)
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).to_bytes(max(len(cipher1_content), len(plain_unknown_content)), sys.byteorder)
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print(
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(
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(
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int.from_bytes(cipher2_content, sys.byteorder)
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^ int.from_bytes(possible_key, sys.byteorder)
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).to_bytes(max(len(cipher2_content), len(possible_key)), sys.byteorder)
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).decode("latin-1")
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)
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