Check out the RSA spec here: https://datatracker.ietf.org/doc/html/rfc8017#section-8.2.2. It's still verification, because all you need is a message and a signature. The message can be constructed from the data in the diploma, presumably. It's just, it's not disclosed to you how to construct the message (maybe it is online somewhere). So a verifier could construct the same message you decrypted, and then run the verification function.
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