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Secure Trigger Algorithms for Secret Disclosure: Definitions and Applications

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This paper details the concept of secure triggers in the context of information security. A trigger is defined as an algorithm that reveals a secret if certain conditions (predicates) about input data are met. The paper presents examples including simple, multiple strings, and subsequence triggers, and demonstrates their security against polynomial-time attackers. Practical applications discussed include information warfare and software protection. The work outlines generic definitions of security for triggers and provides instantiations that confirm such triggers as secure.

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Secure Trigger Algorithms for Secret Disclosure: Definitions and Applications

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  1. Secure Triggers Ariel Futoransky, Emiliano Kargieman, Carlos Sarraute, Ariel Waissbein Core Security Technologies {ek,wata}@coresecurity.com

  2. Definitions • Let S be a secret and P={p} a family of predicates.Let p be a predicate in P • Def: A trigger is an algorithm T(S,p) that takes any input x in {0,1}* and returns S iff p(x)=true.Else, it returns nothing. • Def: The trigger T(S,p) is said secure if a polynomial-time attacker, given P, the sampling distribution, and arbitrary access to T(S,p), cannot learn anything about S.

  3. S Examples (1): Simple Trigger • If the input x is equal to a private value y, then the Secret S is released. T(S,“x=y?") ? x = y

  4. S Examples (2): Multiple Strings Trigger • If the input set X={x1,…,xn} includes a private set Y ={y1,…,yt}, then the Secret S is released. T(S,“XY?") x1 ? y1  … … … yn xn

  5. Examples (3): Subsequence Trigger • If xi1 = y1, …, xit = yt, then the secret S is released. • Where both {yj}, and {ik} are private. T(S,“(xjk)=(yk)?") x xi1

  6. Examples (3): Subsequence Trigger • If xi1 = y1, …, xit = yt, then the secret S is released. • Where both {yj}, and {ik} are private. T(S,“(xjk)=(yk)?") x xi1 xi2

  7. Examples (3): Subsequence Trigger • If xi1 = y1, …, xit = yt, then the secret S is released. • Where both {yj}, and {ik} are private. T(S,“(xjk)=(yk)?") x xi1 xi2 … xit

  8. S Examples (3): Subsequence Trigger • If xi1 = y1, …, xit = yt, then the secret S is released. • Where both {yj}, and {ik} are private. T(S,“(xjk)=(yk)?") x x ? xi1 y1 = xi2 y2 = … … xit yt =

  9. Applications of the triggers • Information Warfare WormAttack • Online automated shopping • Other • Software protection • …

  10. Results • Generic definitions of security for Secure Triggers on the UCS framework • Instantiations: • Simple triggers are secure • Multiple strings triggers are secure • Subsequence triggers are secure • Paper submitted for publication,let us know if you want a copy

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