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27

Public Key

The non-secret half of an asymmetric key pair, shared openly, used to encrypt to the holder of the matching private key or to verify signatures the private key produced.

A public key is freely distributable, paired with a secret private key: data encrypted with the public key can only be decrypted with the private key, and signatures produced with the private key can be verified with the public key. Because it is non-secret, the public key can be published in certificates and directories. PKI binds public keys to identities through certificates, making them trustworthy. Understanding the public key's role is foundational to TLS, signatures, and authentication.

Introduced in: Cryptography Essentials

Examples

  • Publishing a public key in a certificate so others can verify signatures.
  • Encrypting a message to someone using their public key.
  • Validating a TLS server's certificate by checking its public key chain.

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