key: 2017-caching-encrypted-content
type: inproceedings
title: "CryptoCache: Network Caching with Confidentiality"
authors:
  - Jérémie Leguay
  - Georgios S. Paschos
  - Elizabeth A. Quaglia
  - Ben Smyth
year: 2017
month: 5
booktitle: "ICC'17: IEEE International Conference on Communications"
publisher: IEEE Computer Society
doi: 10.1109/ICC.2017.7996866
description: This paper introduces a protocol to cache encrypted content.
keywords: caching, encrypted content, TLS, SSL, security protocol
abstract: >-
  End-to-end encryption seemingly signifies the death of caching, because current methods ensure
  that no two sessions are alike. In this paper, we show that servers can reuse encrypted content
  between sessions, thereby rejuvenating caching. The main idea of our technique is to allow interim
  nodes to cache content based on pseudo-identifiers instead of real file identities. This enables
  caching of reusable pseudo-identifiers, whilst maintaining content confidentiality, i.e., ensuring
  that only the client and the server know the actual identity of the requested file. Furthermore,
  we provide an extension that prevents client linkability, i.e., ensuring it is impossible to tell
  if two clients are viewing the same content. Finally, we formally analyse the balance between
  security and the hit probability performance of the cache.