Paper 2005/284

Foundations and Applications for Secure Triggers

Ariel Futoransky, Emiliano Kargieman, Carlos Sarraute, and Ariel Waissbein


Imagine there is certain content we want to maintain private until some particular event occurs, when we want to have it automatically disclosed. Suppose furthermore, that we want this done in a (possibly) malicious host. Say, the confidential content is a piece of code belonging to a computer program that should remain ciphered and then ``be triggered'' (i.e., deciphered and executed) when the underlying system satisfies a preselected condition which must remain secret after code inspection. In this work we present different solutions for problems of this sort, using different ``declassification'' criteria, based on a primitive we call {\em secure triggers}. We establish the notion of secure triggers in the universally-composable security framework of [Canetti~2001] and introduce several examples. Our examples demonstrate that a new sort of obfuscation is possible. Finally, we motivate its use with applications in realistic scenarios.

Available format(s)
Cryptographic protocols
Publication info
Published elsewhere. The manuscript was presented in the rump sessions of Crypto 2005.
Secure triggersUC frameworkmalicious host problemsecure function evaluation.
Contact author(s)
ariel waissbein @ coresecurity com
2005-08-25: received
Short URL
Creative Commons Attribution


      author = {Ariel Futoransky and Emiliano Kargieman and Carlos Sarraute and Ariel Waissbein},
      title = {Foundations and Applications for Secure Triggers},
      howpublished = {Cryptology ePrint Archive, Paper 2005/284},
      year = {2005},
      note = {\url{}},
      url = {}
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