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The point of the IV is to prevent the same (key,IV) from ever being used for two different messages in practice. This is an absolute requirement for stream ciphers or block cipher modes such as CTR that are effectively stream ciphers, because re-using the same (key,IV) pair lets an eavesdropper trivially obtain the XOR of two plaintext messages, which means ...


1

I read about the AEZ encryption scheme as presented at the CAESAR competition. To me it seems like a construction of an arbitrary length block cipher from a smaller one. The construction is only used in the v1.x of AEZ, because it requires appriximately 1.8 AES calls per block of plaintext, while the one used in v2.0 requires only 1 AES per block ...


1

All of them can be used to deal with unreliable, unordered datagrams; as long as you can derive an IV for the UDP packet then a cipher mode of operation should succeed. You need some kind of unique method of identifying the packet of course. Note that (the information used to generate the) IV may be public. Usually you need some way of identifying the ...



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