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LURK: Server-Controlled TLS Delegation
Authors: Ioana Boureanu, Daniel Migault, Stere Preda, Hyame Assem Alamedine, Sanjay Mishra, Frederic Fieau, Mohammad MannanAbstract:
By design, TLS (Transport Layer Security) is a 2-party, end-to-end protocol. Yet, in practice, TLS delegation is often deployed: that is, middlebox proxies inspect and even modify TLS traffic between the endpoints. Recently, industry-leaders (e.g., Akamai, Cloudflare, Telefonica, Ericcson), standardization bodies (e.g., IETF, ETSI), and academic researchers have proposed numerous ways of achieving safer TLS delegation. We present LURK the LURK (Limited Use of Remote Keys) extension for TLS~1.2, a suite of designs for TLS delegation, where the TLS-server is aware of the middlebox. We implement and test LURK. We also cryptographically prove and formally verify, in Proverif, the security of LURK. Finally, we comprehensively analyze how our designs balance (provable) security and competitive performance.
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