Store confidential information securely using Keychain Access on Mac
You can use Secure Notes in Keychain Access to store confidential information. This information can be completely unrelated to your computer, such as combinations to locks, personal identification numbers (PINs) for bank accounts, credit card numbers, confidential notes, cryptographic keys, and any other information that you want to keep private.
Create a Secure Note
In the Keychain Access app on your Mac, select a keychain in the Keychains list.
If you’re not sure which keychain to pick, choose the login keychain.
If the keychain is locked, click the lock icon, then enter your keychain password to unlock it.
Choose File > New Secure Note Item.
Type a name for the note to help you remember what it is.
In the Note field, type or paste the information you want to preserve.
View the contents of a Secure Note
In the Keychain Access app on your Mac, select Secure Notes in the Category list.
Double-click the note, then select Show Note.
You’ll be asked for your keychain password if you haven’t selected “Allow all applications to access this item” in the Access Control pane.
Type your login password to see the note, then click Allow or “Always allow”.
If you want this note to be secure, don’t click “Always allow”.