Could there be a simpler way? In 1970, James Ellis, a BritishĮngineer and mathematician, was working on an ideaįor non-secret encryption. Manage all of these keys and send thousands of messages Plus, if Alice needs toĬommunicate with multiple people, perhaps she's a bank, then she's going to haveĮxchange distinct keys with each person. Shared key is often impossible if Alice and Bob can't physically meet or requires extra communications overhead when using the Diffy-Hellman key exchange. So for Alice and Bob toĬommunicate securely, they must first share identical keys. To decrypt a ciphertext, you use the same key (lock clinking) As you may recall, encryption is a mapping from some message using a specific key, to a ciphertext message. That is, the sender encrypts their message using a specific key, and the receiver decrypts Up until the 1970s, cryptography had beenīased on symmetric keys.
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