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Paper 2014/757

Adaptively Secure Broadcast Encryption with Small System Parameters

Mark Zhandry

Abstract

We build the first public-key broadcast encryption systems that simultaneously achieve adaptive security against arbitrary number of colluders, have small system parameters, and have security proofs that do not rely on knowledge assumptions or complexity leveraging. Our schemes are built from either composite order multilinear maps or obfuscation and enjoy a ciphertext overhead, private key size, and public key size that are all poly-logarithmic in the total number of users. Previous broadcast schemes with similar parameters are either proven secure in a weaker static model, or rely on non-falsifiable knowledge assumptions.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
Adaptive securitybroadcast encryptionmultilinear maps
Contact author(s)
mzhandry @ stanford edu
History
2015-03-08: revised
2014-09-29: received
See all versions
Short URL
https://ia.cr/2014/757
License
Creative Commons Attribution
CC BY
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