Saitama selected an asymmetric algorithm and encrypted some information with his private key and then posted the encrypted information to a public paste site that anyone can access.

Users will need two things to decrypt that information: $1.$ The algorithm used for encryption, and $2.\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.($What is item number $2?)$

Anybody's public key

Saitama's public key

The paste site's public key.

Saitama's private key.