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right so far we have solved many important problems by using cryptography the first thing that we sold was confidentiality remember that we talked about symmetric key cryptography and by using block ciphers or stream ciphers we provided encryption and dissolved the problem of confidentiality and recently we solved the problem of authentication by using message authentication codes so now a nature natural question they ask is can we provide the board at the same time so can we have an algorithm that provides both confidentiality and authentication and this is called actually authenticated encryption and the answer is yes we can do it and there are many different variants so you can use a block cipher just for this or you can use a block cipher and combine it with the hash function to provide both confidentiality and authentication but also you can have a dedicated algorithm just designed for authenticated encryption so these will be the topics that we are going to talk now so letamp;#3
