What uses two keys: a public key that everyone can have and a private key for only the recipient?

Question

BlackTom AI · Accepted Answer

The question asks about a cryptographic method that uses two keys: a public key that is shared openly and a private key that remains with the recipient.
Option 1: 'Advanced encryption standards' refers to a symmetric encryption algorithm (AES) that uses a single shared key for both encryption and decryption, not a pair of keys. This means it does not fit the two-key description.
Option 2: 'Public key encryption' is specifically the system where a public key is distributed to everyone and a private key is kept secret by the recipient, enabling secure communication and asymmetric encryption. This matches the described two-key setup precisely.
Option 3: 'Certificate authorities' are entities that issue digital certificates to verify identities and establish trust in public-key infrastructure, but they are not the cryptographic mechanism that uses two keys themselves. They function within the PKI to validate keys rather than performing encryption with a two-key pair.
In summary, the concept described—a publicly shared key paired with a private recipient key—aligns with public key encryption, whereas AES uses a single shared key and certificate authorities are trust-issuing entities rather than the two-key method itself.

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