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Leaving text encryption and padding questions aside and focusing on the header stuff, here's how I'd approach the problem: FileHeader = { BYTE Salt[16] # Random bytes, K = KDF(Salt, Password) BYTE EncHdr[] # EncHdr = AES-GCM(K, h0...h5) } Salt is a sequence of random bytes (it's there to prevent Rainbow table attacks) EncHdr is the encrypted version ...

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