Twenty-ninth International Workshop on Security Protocols

Cambridge, UK – 26-27 March 2025

The Twenty-ninth International Workshop on Security Protocols will take place from Wednesday 26 March to Thursday 27 March 2025 in Cambridge, United Kingdom. It will be dedicated to the memory of Ross Anderson and preceded by the Rossfest Symposium, which will take place on Tuesday 25 March 2025, also in Cambridge, UK. Come to both!

As in previous years, attendance at the International Workshop on Security Protocols is by invitation only. How do I get invited?


The theme of the 2025 workshop is: “Controversial Security - In honour of Ross Anderson”. In other words, “any security topic that Ross Anderson might have wanted to debate with you”, which leaves you with plenty of leeway.

This is a workshop for discussion of novel ideas, rather than a conference for finished work. We seek papers that are likely to stimulate an interesting discussion. New authors are encouraged to browse through past volumes of post-proceedings (search for Security Protocols Workshop in the Springer LNCS series) to get a flavour for the variety and diversity of topics that have been accepted in past years, as well as the lively discussion that has accompanied them.


The long-running Security Protocols Workshop has hosted lively debates with many security luminaries (the late Robert Morris, chief scientist at the NSA and well known for his pioneering work on Unix passwords, used to be a regular) and continues to provide a formative event for young researchers. The post-proceedings, published in LNCS, contain not only the refereed papers but the curated transcripts of the ensuing discussions (see the website for pointers to past volumes).

Attendance is by invitation only. To be considered for invitation you must submit a position paper: it will not be possible to come along as just a member of the audience. Start writing now! “Writing the paper is how you develop the idea in the first place”, in the wise words of Simon Peyton-Jones.

The Security Protocols Workshop is, and has always been, highly interactive. We actively encourage participants to interrupt and challenge the speaker. The presented position papers will be revised and enhanced before publication as a consequence of such debates. We believe the interactive debates during the presentations, and the spontaneous technical discussions during breaks, meals and the formal dinner, are part of the DNA of our workshop. We encourage you to present stimulating and disruptive ideas that are still at an initial stage, rather than “done and dusted” completed papers of the kind that a top-tier conference would expect. We are interested in eliciting interesting discussion rather than collecting archival material.


Short indicative submissions are preferred. You will have the opportunity to extend and revise your paper both before the pre-proceedings are issued, and again after the workshop. At the workshop, you will be expected to spend a few minutes introducing the idea of your paper, in a way that facilitates a longer more general discussion. Pre-proceedings will be provided at the workshop.

See the Submission page for more details.

Accommodation in Cambridge

The chosen dates are out of term, meaning you might be able to book a room in one of the 31 colleges through Otherwise, consider,, or your favourite online booking aggregator.

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If you have any enquiries about the workshop that are not answered by the Dates, Ground Rules or Submission pages, please contact the Program Chair (Fabio Massacci) or the General Chair (Frank Stajano).