# AAC header pattern check if data[0:3] != b'\x00\x00\x01': print("Warning: Not a valid AAC file. Decryption may have failed.")

Published: April 18, 2026 | Reading Time: 6 min download viber voice message

for i in range(len(data)): data[i] ^= key[i % len(key)] # AAC header pattern check if data[0:3]

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