How to test the protocols for vulnerability?

There is a task to test the data transfer Protocol. How do I test protocols looking for vulnerabilities?
There is evidence that when the encryption uses the AES-256, RSA
2 answers
June 3rd 19 at 21:02
Read about fuzzing, for example:
June 3rd 19 at 21:04
Typically, the protocols verify their purchases, and then simulate.

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