SoK: Web Authentication in the Age of End-to-End Encryption

• URL: http://arxiv.org/abs/2406.18226v1
• Date: Wed, 26 Jun 2024 10:23:58 GMT
• Title: SoK: Web Authentication in the Age of End-to-End Encryption
• Authors: Jenny Blessing, Daniel Hugenroth, Ross J. Anderson, Alastair R. Beresford,
• Abstract summary: E2EE messaging and backup services have brought new challenges for usable authentication. passwordless authentication ("passkeys") has become a promising candidate to replace passwords altogether. E2EE authentication quickly becomes relevant not only for a niche group of dedicated E2EE enthusiasts but for the general public.
• Score: 9.053236170794579
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The advent of end-to-end encrypted (E2EE) messaging and backup services has brought new challenges for usable authentication. Compared to regular web services, the nature of E2EE implies that the provider cannot recover data for users who have forgotten passwords or lost devices. Therefore, new forms of robustness and recoverability are required, leading to a plethora of solutions ranging from randomly-generated recovery codes to threshold-based social verification. These implications also spread to new forms of authentication and legacy web services: passwordless authentication ("passkeys") has become a promising candidate to replace passwords altogether, but are inherently device-bound. However, users expect that they can login from multiple devices and recover their passwords in case of device loss--prompting providers to sync credentials to cloud storage using E2EE, resulting in the very same authentication challenges of regular E2EE services. Hence, E2EE authentication quickly becomes relevant not only for a niche group of dedicated E2EE enthusiasts but for the general public using the passwordless authentication techniques promoted by their device vendors. In this paper we systematize existing research literature and industry practice relating to security, privacy, usability, and recoverability of E2EE authentication. We investigate authentication and recovery schemes in all widely-used E2EE web services and survey passwordless authentication deployment in the top-200 most popular websites. Finally, we present concrete research directions based on observed gaps between industry deployment and academic literature.

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