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There are many possibilities here, depending on the particulars of where exactly you will use it. Your use case may require a random looking derived key, where the 1024 bytes of entropy have been distributed evenly over all the bytes of the final key. In that case there's no avoiding a key derivation function. You will have to use either a block cipher, a ...


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The seed should be the key and the nonce or IV. Those input parameters determine the value of the key stream. Note that the nonce may be implied if the key is not reused, in that case the key may be the only seed, with the nonce having a static value (you should however make sure that you are not vulnerable to multi-target attacks if you use a static IV, see ...


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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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