Sensitive data is encoded using a HMAC. In order to search for some specific sensitive data in the audit log, first calculate the HMAC for the data, then search for that HMAC in the logs.
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plaintext: the quick brown fox key-version: 1 base64-encoded: false
hmac: sbox:hashed:v1:oSoTBSIbKvBZT6wpRQLqFHXhUYE5Cg2IErx0kOyaIQc=