Public Key Locally Decodable Codes with Short Keys

摘要

This work considers locally decodable codes in the computa tionally bounded channel model. The computationally bounded channel model, introduced by Lipton in 1994, views the channel as an adver sary which is restricted to polynomial-time computation. Assuming the existence of IND-CPA secure public-key encryption, we present a con struction of public-key locally decodable codes, with constant codeword expansion, tolerating constant error rate, with locality O(λ), and negli gible probability of decoding failure, for security parameter λ. Hemen way and Ostrovsky gave a construction of locally decodable codes in the public-key model with constant codeword expansion and locality O(λ~2), but their construction had two major drawbacks. The keys in their scheme were proportional to n, the length of the message, and their schemes were based on the Φ-hiding assumption. Our keys are of length proportional to the security parameter instead of the message, and our construction relies only on the existence of IND-CPA secure encryption rather than on specific number-theoretic assumptions. Our scheme also decreases the locality from O(λ~2) to O(λ). Our construction can be mod ified to give a generic transformation of any private-key locally decodable code to a public-key locally decodable code based only on the existence of an IND-CPA secure public-key encryption scheme.