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"I don’t know why I check this...'' - Investigating Expert Users' Strategies to Detect Email Signature Spoofing Attacks

  • OpenPGP is one of the two major standards for end-to-end email security. Several studies showed that serious usability issues exist with tools implementing this standard. However, a widespread assumption is that expert users can handle these tools and detect signature spoofing attacks. We present a user study investigating expert users' strategies to detect signature spoofing attacks in Thunderbird. We observed 25 expert users while they classified eight emails as either having a legitimate signature or not. Studying expert users explicitly gives us an upper bound of attack detection rates of all users dealing with PGP signatures. 52% of participants fell for at least one out of four signature spoofing attacks. Overall, participants did not have an established strategy for evaluating email signature legitimacy. We observed our participants apply 23 different types of checks when inspecting signed emails, but only 8 of these checks tended to be useful in identifying the spoofed or invalid signatures. In performing their checks, participants were frequently startled, confused, or annoyed with the user interface, which they found supported them little. All these results paint a clear picture: Even expert users struggle to verify email signatures, usability issues in email security are not limited to novice users, and developers may need proper guidance on implementing email signature GUIs correctly.

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Author:Peter Mayer, Damian Poddebniak, Konstantin Fischer, Marcus Brinkmann, Juraj Somorovsky, Sebastian Schinzel, Melanie Volkamer
Parent Title (English):Eighteenth Symposium on Usable Privacy and Security (SOUPS 2022)
Publisher:USENIX Association
Place of publication:Boston, MA
Document Type:Conference Proceeding
Date of Publication (online):2022/10/22
Date of first Publication:2022/08/01
Provider of the Publication Server:FH Münster - University of Applied Sciences
Release Date:2022/10/24
First Page:77
Last Page:96
Faculties:Elektrotechnik und Informatik (ETI)
Publication list:Schinzel, Sebastian
Licence (German):License LogoBibliographische Daten