The organizing committee of the International Workshop on Security Protocols is pleased to announce that the twenty-seventh workshop will be held 10-12 April 2019 at Trinity College in Cambridge, UK. Attendance is by invitation only: we invite the submission of position papers by 4 Jan 2019, and authors of selected papers will be invited to participate in the workshop.

The theme of the 2019 workshop is "security protocols for humans". Getting protocol details right is critical in the presence of a malicious adversary, but so is understanding the context in which a protocol is deployed: protocols are components of larger systems that human beings put their trust in. How can we design protocols to expose meaningful information about state and functionality to their users? What are the consequences when we don't? How can we bridge the gap between technical definitions of protocol correctness and users' security expectations?

As in previous years, the theme should inspire rather than constrain: all submissions in the broad area of security protocols will be considered. Authors should submit position papers or extended abstracts to jonathan.anderson@mun.ca by 4 Jan 2019; responses will be given by 11 Feb 2019.