A public key is a cryptographic key that is used to encrypt messages and verify digital signatures. It is one of a pair of keys (the other being a private key) used in public key cryptography, also known as asymmetric cryptography.

The public key is used to encrypt messages and verify digital signatures, while the private key is used to decrypt messages and create digital signatures. The public key can be freely shared with anyone, while the private key must be kept secret.
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