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To achieve the confidentiality and the non-repudiation in asymmetric key algorithms, they are two methods: 1) Alice can encrypt M first and then sign the
To achieve the confidentiality and the non-repudiation in asymmetric key algorithms, they are two methods: 1) Alice can encrypt M first and then sign the result :[{M}Bob]Alice 2) Alice can sign the message M and encrypt the result:{ [M]Alice} Bob 3) Discuss one disadvantage of each of the two methods
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