Cryptology ePrint Archive: Report 2011/576

Efficient Multicast Key Distribution Using HOWP-based Dynamic Group Access Structures

Jing Liu and Qiong Huang and Bo Yang and Yang Zhang

Abstract: When assigning personal keys, stateful multicast key distribution (MKD) protocols usually rely on some type of dynamic group access structure which helps achieve a better tradeoff among storage, communication and computation overheads. However, there exist some stateful MKD protocols whose personal key assignments are based on two static group access structures called Dual Hash Chain (DHC) and Binary Hash Tree (BHT). We introduce two new types of group access structures called Dual Homomorphic One-way Function Chain (D-HOFC) and Top-Down Homomorphic One-way Function Tree (TD-HOFT). Both can be regarded as dynamic counterparts of DHC and BHT, respectively. Our research motivation is to investigate what benefits these two new dynamic structures will bring for MKD protocols compared with their static counterparts. Using D-HOFC, we propose a time-based MKD protocol that counters the rejoining member attack on a DHC-based protocol, and a stateful user-based MKD protocol that has a lower computational overhead for Group Controller (GC) than the DHC-based protocol. Using TD-HOFT, we design a stateful user-based MKD protocol that outperforms the original EKT protocol. Performance comparisons and experiment results show that our protocols based on dynamic structures have their own advantages compared with those based on the corresponding static counterparts.

Category / Keywords: multicast key distribution, group access structure, homomorphic one-way permutation (HOWP)

Date: received 25 Oct 2011, last revised 4 Sep 2012

Contact author: liujing3 at mail sysu edu cn

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Version: 20120904:064738 (All versions of this report)

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