The Transport Layer Security (TLS) protocol is the most used protocol nowadays to securely establish a safe connection. It is used in many different contexts, such as in authentication and authorization frameworks or in web-based digital identity systems. This protocol allows exchanging data between two parties, with 5 main security properties: Authentication (Peer Authentication and Message Authentication), Integrity, and Confidentiality, protection against Filtering attacks, and protection against Replay attacks. To this large use of the TLS protocol, a long list of attacks was discovered in the last decade. Nowadays, there are some tools, such as Qualys SSL Server Test, used to test the resistance of a TLS server against various attacks.