I'm trying to understand the SSL/TLS protocol and I'm lost on a specific point.
What is the link between the public server key (eg. : "EC 256 bits" or " RSA 2048 bits") and the cipher suites ?
This post give an answer : SSL certificates and cipher suites correspondence but when I try to analyse cipher suites for https://www.wikipedia.org, there is something illogical to me. wikipedia.org has an EC 256 bits key and TLS_RSA_WITH_AES_128_CBC_SHA is an accepted cipher suite. According to this post SSL certificates and cipher suites correspondence (if I understand it correctly) it should not be possible because
" For TLS_RSA_* cipher suites, key exchange uses encryption of a client-chosen random value with the server's RSA public key, so the server's public key must be of type RSA, and must be appropriate for encryption (the server's certificate must not include a Key Usage extension that says "signature only"). "
So, why can we use TLS_RSA_WITH_AES_128_CBC_SHA on wikipedia?