Which two statements describe the use of asymmetric algorithms?

Asymmetric algorithms are characterized by the use of a pair of keys: a public key and a private key. The correct statement highlights that if a private key is used to encrypt data, the corresponding public key must be utilized for decryption. This establishes a secure method of communication where a user can encrypt a message with their private key, ensuring that only someone with access to the corresponding public key can decrypt it.

For instance, when a sender wants to ensure the integrity and confidentiality of a message, they can sign the message with their private key. The recipient can then verify the signature using the sender's public key. This key pair mechanism is fundamental to ensuring that data remains secure during transmission and that the identities of the communicating parties are validated.

The other options misrepresent the nature of asymmetric algorithms, particularly regarding key usage and their capabilities in processes like digital signatures. In fact, asymmetric algorithms are indeed utilized for digital signatures, enabling verification of authenticity and integrity of the messages.