This book constitutes the Revised Selected Papers of the 29th International Workshop on Security Protocols, held in Cambridge, UK, during March 26–27, 2025.Fourteen papers out of 21 submissions were selected for publication in this book, presented together with the respective transcripts of discussions. The theme of this year's workshop was “Controversial Security - In honour of Ross Anderson”.

This book constitutes the refereed proceedings of the International Workshop on Security Protocols held in Cambridge, UK, in April 1996, in the context of the special program on computer security, cryptology, and coding theory at the Isaac Newton Institute.The 17 revised full papers and one abstract included in the book were carefully selected. Among the topics addressed are several types of public key cryptosystems, digital cash, electronic commerce, digital signatures, and visual cryptography. Besides original theoretical results, the collection of papers show a strong applications-oriented component.

This book constitutes the Revised Selected Papers of the 29th International Workshop on Security Protocols, held in Cambridge, UK, during March 26–27, 2025.Fourteen papers out of 21 submissions were selected for publication in this book, presented together with the respective transcripts of discussions. The theme of this year's workshop was “Controversial Security - In honour of Ross Anderson”.

This book constitutes the refereed proceedings of the International Workshop on Security Protocols held in Cambridge, UK, in April 1996, in the context of the special program on computer security, cryptology, and coding theory at the Isaac Newton Institute.The 17 revised full papers and one abstract included in the book were carefully selected. Among the topics addressed are several types of public key cryptosystems, digital cash, electronic commerce, digital signatures, and visual cryptography. Besides original theoretical results, the collection of papers show a strong applications-oriented component.