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TLS can resume previous connections via abbreviated resumption handshakesthat significantly decrease the delay and save expensive cryptographicoperations. For that, cryptographic TLS state from previous connections isreused. TLS version 1.3 recommends to avoid resumption handshakes, and thus thereuse of cryptographic state, when connecting to a different hostname. In thiswork, we reassess this recommendation, as we find that sharing cryptographicTLS state across hostnames is a common practice on the web. We propose a TLSextension that allows the server to inform the client about TLS state sharingwith other hostnames. This information enables the client to efficiently resumeTLS sessions across hostnames. Our evaluation indicates that our TLS extensionprovides huge performance gains for the web. For example, about 58.7% of the20.24 full TLS handshakes that are required to retrieve an average website onthe web can be converted to resumed connection establishments. This yields to areduction of 44% of the CPU time consumed for TLS connection establishments.Furthermore, our TLS extension accelerates the connection establishment with anaverage website by up to 30.6% for TLS 1.3. Thus, our proposal significantlyreduces the (energy) costs and the delay overhead in the encrypted web.

Enhanced Performance for the encrypted Web through TLS Resumption across Hostnames