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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
In other words, the kind of signing key that would be used to create an authentication token, say if you or I were logging into our personal Outlook.com service.
Source: https://nakedsecurity.sophos.com/2023/07/20/s3-ep144-when-threat-hunting-goes-down-a-rabbit-hole/