In asymmetric cryptography, which elements constitute the key pair used for encryption and decryption?

In asymmetric cryptography, which elements constitute the key pair used for encryption and decryption?

• A. Public key and private key
• B. Symmetric key and private key
• C. Two public keys
• D. A password and a private key

Answer: (A)

In asymmetric cryptography, the key pair used for encryption and decryption is a public key and a private key. The public key can be shared openly and is used to encrypt messages intended for the key owner or to verify a signature created with the private key. The private key stays secret and is used to decrypt those messages or to create signatures that others can verify with the public key. This separation lets anyone send confidential data or verify identity without having to share a secret key in advance. The other options don’t fit the concept. A symmetric key is a single shared secret used for both encryption and decryption, not part of a public–private pair. Two public keys don’t enable decryption because the private key is what must be used to decrypt. A password paired with a private key isn’t the standard key pair used in public-key cryptography for encryption and decryption.

In asymmetric cryptography, the key pair used for encryption and decryption is a public key and a private key. The public key can be shared openly and is used to encrypt messages intended for the key owner or to verify a signature created with the private key. The private key stays secret and is used to decrypt those messages or to create signatures that others can verify with the public key. This separation lets anyone send confidential data or verify identity without having to share a secret key in advance.

The other options don’t fit the concept. A symmetric key is a single shared secret used for both encryption and decryption, not part of a public–private pair. Two public keys don’t enable decryption because the private key is what must be used to decrypt. A password paired with a private key isn’t the standard key pair used in public-key cryptography for encryption and decryption.