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May 17, 2016 at 16:36 comment added galinette What if you add a hash to the message, and encrypt the whole, and if both A and B keep their key secret? Is this flawed?
May 17, 2016 at 11:11 comment added galinette The A key(s) would be the sold product, and one of the options was to store it inside a hardware dongle, where we have only 4kB space... Also, the implementation would be simpler (hash then encrypt). But if this is a bad idea we will take another option.
May 17, 2016 at 10:50 history answered Lucas Kauffman CC BY-SA 3.0