When I sat down at my MacBook Pro laptop running OS X El Capitan today, I saw the message below (image):
Do you want to allow access to this item?
The "A49A5BE4-6FB4-4399-9EB3-3DBA06717BEF" wasn't an identifier I
recognized. If you see such a message, you can search for the identifier
in the message using the Keychain Access application, which is located
Applications/Utilities folder. After opening the
program, click on Edit and then select Find. In the upper,
right-hand corner of the window, you will see a field to the right of a
magnifying glass icon where you can type the text for which you wish to
search. I could type just part of the string, e.g. "A49A5" to locate
the relevant entry.
If you wish to see the password for the entry, you can check the check box next to "show password"; you will be prompted to provide the keychain password to see the password for that particular entry in the keychain.
If you know the account for an entry, you can also look up the password from the command line using the security command from the command line by opening a Terminal window and issuing a command like the one below:
$ security find-internet-password -ga "ABC.EXAMPLE.COM\jasmith1" | grep "password" password: "ThePassword1234" $