What type of information does a Java keystore store?

A Java keystore is designed to securely store cryptographic keys and certificates utilized to perform various security-related tasks, such as securing communication via SSL/TLS or signing data. The key function of a keystore is to hold both public certificates and their corresponding private keys, which together form a digital identity.

The storage of public certificates is crucial because they are used to verify the ownership of a public key. The corresponding private key, which must remain confidential, is essential for decryption operations or for signing data to ensure its authenticity and integrity.

When the keystore contains both types of information, it supports scenarios where secure communications are required, allowing the keystore to manage the full lifecycle of the cryptographic assertions involved.

In contrast, the other options present limitations. Options that mention only public certificates or only private keys do not fully utilize the keystore’s capabilities. Similarly, while signed certificates from a certificate authority are essential in a cryptographic framework, they do not encompass the complete set of functionalities that a keystore provides, especially regarding the handling of private keys. Thus, the correct understanding of a Java keystore is that it stores both public certificates and their corresponding private keys, enabling robust security implementations in applications.