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2009
Springer

On the (Im)Possibility of Key Dependent Encryption

9 years 10 months ago
On the (Im)Possibility of Key Dependent Encryption
We study the possibility of constructing encryption schemes secure under messages that are chosen depending on the key k of the encryption scheme itself. We give the following separation results that hold both in the private and in the public key settings: ? Let H be the family of poly(n)-wise independent hash-functions. There exists no fully-black-box reduction from an encryption scheme secure against key-dependent messages to one-way permutations (and also to families of trapdoor permutations) if the adversary can obtain encryptions of h(k) for h H. ? There exists no reduction from an encryption scheme secure against key-dependent messages to, essentially, any cryptographic assumption, if the adversary can obtain an encryption of g(k) for an arbitrary g, as long as the reduction's proof of security treats both the adversary and the function g as black boxes.
Iftach Haitner, Thomas Holenstein
Added 25 Nov 2009
Updated 25 Nov 2009
Type Conference
Year 2009
Where TCC
Authors Iftach Haitner, Thomas Holenstein
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