CCA2 secure IBE: standard model efficiency through authenticated symmetric encryption
We propose two constructions of chosen-ciphertext secure identity-based encryption (IBE)
schemes. Our schemes have a security proof in the standard model, yet they offer
performance competitive with all known random-oracle based schemes. The efficiency
improvement is obtained by combining modifications of the IBE schemes by Waters [38] and
Gentry [21] with authenticated symmetric encryption.
schemes. Our schemes have a security proof in the standard model, yet they offer
performance competitive with all known random-oracle based schemes. The efficiency
improvement is obtained by combining modifications of the IBE schemes by Waters [38] and
Gentry [21] with authenticated symmetric encryption.
Abstract
We propose two constructions of chosen-ciphertext secure identity-based encryption (IBE) schemes. Our schemes have a security proof in the standard model, yet they offer performance competitive with all known random-oracle based schemes. The efficiency improvement is obtained by combining modifications of the IBE schemes by Waters [38] and Gentry [21] with authenticated symmetric encryption.
Springer
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