What cryptography method secures communications on the Internet by using two different keys for encryption and decryption?

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Asymmetric cryptography uses a pair of mathematically linked keys: a public key, which can be broadcast, and a private key, which must remain secret. Depending on the protocol, this pair makes it possible to encrypt, establish a shared secret or produce a verifiable digital signature. On the Internet, these mechanisms participate in particular in the authentication of servers and the establishment of secure connections, before faster symmetric algorithms protect the exchanges. “Public key cryptography” is another name for asymmetric cryptography.