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E.1.1 Encrypted System Files

An encrypted system file uses SAV as the identifier in its header.

Before encryption, a system file is appended with as many null bytes as needed (possibly zero) to make it a multiple of 16 bytes in length, so that it fits exactly in a series of AES blocks. (This implies that encrypted system files must always be compressed, because otherwise a system file with only a single variable might appear to have an extra case.)