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5

Is it valid to call this table an S-Box? Not really; at least, not with the meaning we usually give to "S-box". The "S" in "S-box" stands for Substitution; we take the data, and replace it with a value from the S-box (using the data as an index into the S-box). The classical (if not the original) example is the S-boxes within AES; at certain points ...


3

The two plaintexts are almost certainly identical. At the very least, any difference between them must be representable in 32 bytes, since that's as much information as the XOR of the encrypted files contains. Assuming that the plaintexts are indeed identical, we can also see that changing the encryption key has a very simple and predictable effect on the ...


3

That is an absolutely terrible idea, here is why. His algorithm works as follows: Hash the input data Take the length of data (presumably in bytes) TRUNCATE the hash so that the length value in bytes plus the truncated hash is the output length of a standard MD5 hash (128 bits) Here is an example of a 1MB data file being hashed MD5(data) = ...



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