Description: A GPG subkey is a secondary key used alongside a main GPG key for specific purposes, such as signing documents or encrypting messages. In the context of Public Key Infrastructure (PKI), subkeys allow for more flexible and secure management of cryptographic keys. By having a main key that can be used for authentication and other functions, subkeys can be generated and revoked as needed without compromising the main key. This is particularly useful in situations requiring a high level of security, as it allows users to keep their main key in a secure environment while using subkeys for daily operations. Subkeys can also have different levels of permissions and purposes, enabling users to customize their use according to specific needs. In summary, GPG subkeys are essential tools in cryptographic key management, providing an additional layer of security and flexibility in communication and information exchange.
