Mac OS X Keychain File
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What is a KEYCHAIN file?
A KEYCHAIN file is created by Apple Keychain, a program bundled with Mac OS X that stores authentication information. It contains an encrypted collection of resource authentication data, such as passwords, certificates, and private keys.
Common KEYCHAIN Filenames
login.keychain - The global user keychain containing passwords, website logins, trusted identities, developer certificates, and other keys. It is located in the ~/Library/Keychains/ directory.