How to find out who created a Key Pair in aws ec2?

If CloudTrail is setup it would have recorded the event which includes the user. The Following is lifted from the AWS Cloudtrail docs:

{"Records": [{
    "eventVersion": "1.0",
    "userIdentity": {
        "type": "IAMUser",
        "principalId": "EX_PRINCIPAL_ID",
        "arn": "arn:aws:iam::123456789012:user/Alice",
        "accountId": "123456789012",
        "accessKeyId": "EXAMPLE_KEY_ID",
        "userName": "Alice",
        "sessionContext": {"attributes": {
            "mfaAuthenticated": "false",
            "creationDate": "2014-03-06T15:15:06Z"
        }}
    },
    "eventTime": "2014-03-06T17:10:34Z",
    "eventSource": "ec2.amazonaws.com",
    "eventName": "CreateKeyPair",
    "awsRegion": "us-east-2",
    "sourceIPAddress": "72.21.198.64",
    "userAgent": "EC2ConsoleBackend, aws-sdk-java/Linux/x.xx.fleetxen Java_HotSpot(TM)_64-Bit_Server_VM/xx",
    "requestParameters": {"keyName": "mykeypair"},
    "responseElements": {
        "keyName": "mykeypair",
        "keyFingerprint": "30:1d:46:d0:5b:ad:7e:1b:b6:70:62:8b:ff:38:b5:e9:ab:5d:b8:21",
        "keyMaterial": "\u003csensitiveDataRemoved\u003e"
    }
}]}

If cloudTrail was not enabled when the keypair was created i think you might be out of luck. If you have paid support you could ask the question to AWS or otherwise use the AWS forums - they may know more than me.

How to find out who created a Key Pair in aws ec2?

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