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According to the following link (Slide 5) and to what I studied last semester, http://www.ee.ic.ac.uk/pcheung/teaching/ee4_network_security/L02DESIDESAES.pdf During the final round (Round 16) before the inverse permutation, the left and right halves of the bits will be swapped then the inverse permutation will be applied.


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Ad hoc… What you’re describing is not much different from the encryption in storage systems… only that your “storage system” is a file (foo.txt) instead of a hard drive. Now, in a perfect world you would encrypt every block of data (that you store in foo.txt) with its own key, but that would be pretty impractical in your situation. From my point of view, ...


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No, they are not conceptually related. A keystream is the output of a stream cipher and is of (effectively, for modern ciphers) infinite length. If you need to encrypt more plaintext, you use the cipher to produce more bytes of keystream. On the other hand, password salts are of fixed size and their purpose is to make every password effectively unique. A ...


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Is appending the hash of the plaintext to the end of an encrypted message sufficient to ensure integrity? Not in the sense of authentication. Such a construction is malleable for many reasonable encryption algorithms. It also leaks the plaintext to anyone who can guess it, since they can calculate $h(P_i)$ for guesses (brute force or dictionary attack) ...



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