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2016
IEEE

Self-updatable encryption with short public parameters and its extensions

3 years 18 days ago
Self-updatable encryption with short public parameters and its extensions
Cloud storage is very popular since it has many advantages, but there is a new threat to cloud storage that was not considered before. Self-updatable encryption that updates a past ciphertext to a future ciphertext by using a public key is a new cryptographic primitive introduced by Lee, Choi, Lee, Park, and Yung (Asiacrypt 2013) to defeat this threat, in which an adversary who obtained a past private key can still decrypt a (previously unread) past ciphertext stored in cloud storage. Additionally, an SUE scheme can be combined with an attribute-based encryption (ABE) scheme to construct a powerful revocable-storage ABE (RS-ABE) scheme introduced by Sahai, Seyalioglu, and Waters (Crypto 2012) that provides the key revocation and ciphertext updating functionality for cloud storage. In this paper, we propose an efficient SUE scheme and its extended schemes. First, we propose an SUE scheme with short public parameters in prime-order bilinear groups and prove its security under a q-type ...
Kwangsu Lee
Added 01 Apr 2016
Updated 01 Apr 2016
Type Journal
Year 2016
Where DCC
Authors Kwangsu Lee
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