The idea was that PowerTalk could communicate with many mail servers and online services, so it would use a keychain file to hold user authentication information within the application to automatically and securely log the user into the variety of services. Keychains were originally developed in the early 1990s for use with an Apple email system called PowerTalk. This Tech 101 article explains the functions of Keychain in macOS Sierra as well as how to access and edit Keychain files. Since then, Keychain has expanded to Appleās mobile devices and synchronizes keychain files between devices through iCloud. ![]() ![]() ![]() Keychain is a password management system for macOS and iOS that was originally released with Mac OS 8.6 back in 1999 as a way of holding passwords, private keys, certificates and secure notes in encrypted files on the machine.
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