Описание тега keytool
Key and Certificate Management Tool: manages a keystore (database) of cryptographic keys, X.509 certificate chains, and trusted certificates.
Keytool is a key and certificate management utility. It allows users to administer their own public/private key pairs and associated certificates for use in self-authentication (where the user authenticates himself/herself to other users/services) or data integrity and authentication services, using digital signatures. It also allows users to cache the public keys (in the form of certificates) of their communicating peers.