Securely Obfuscating Re-encryption
Susan Hohenberger, Guy Rothblum, abhi shelat, and Vinod Vaikuntanathan
Theory of Cryptography Conference (TCC'07), Amsterdam, The Netherlands, Feb 2007, p. 233-252.
Theory of Cryptography Conference (TCC'07), Amsterdam, The Netherlands, Feb 2007, p. 233-252.
We present the first positive obfuscation result for a traditional cryptographic functionality. This positive result stands in contrast to well-known negative impossibility results~\cite{betal01} for general obfuscation and recent negative impossibility and improbability~\cite{golkal05} results for obfuscation of many cryptographic functionalities.
Whereas other positive obfuscation results in the standard model apply to very simple point functions, our obfuscation result applies to the significantly more complicated and widely-used re-encryption functionality. This functionality takes a ciphertext for message $m$ encrypted under Alice's public key and transforms it into a ciphertext for the same message $m$ under Bob's public key.
[PDF]
Whereas other positive obfuscation results in the standard model apply to very simple point functions, our obfuscation result applies to the significantly more complicated and widely-used re-encryption functionality. This functionality takes a ciphertext for message $m$ encrypted under Alice's public key and transforms it into a ciphertext for the same message $m$ under Bob's public key.
[PDF]
0 TrackBacks
Listed below are links to blogs that reference this entry: Securely Obfuscating Re-encryption.
TrackBack URL for this entry: http://www.cs.virginia.edu/~shelat/mt/mt-tb.cgi/2
Leave a comment