Keychain. Keychain is actually a developed-in Resource in macOS that suppliers user passwords and accounts. An adversary who is aware the credential accessibility with the login to Keychain can access all the opposite credentials stored in it. Persona non Grata (PnG) concentrates on the motivations and abilities of human attackers. https://www.researchgate.net/publication/365308473_Development_of_Cyber_Attack_Model_for_Private_Network