A Hierarchical Identity-Based Cryptosystem
Yanming Wang · Acta Scientiarum Naturalium Universitatis Sunyatseni · 2007
A new hierarchical identity based(ID-based) cryptosystem is proposed,including hierarchical ID-based encryption and signature.In random oracle model,both hierarchical ID-based encryption and signature schemes are provably secure.Furthermore,the new hierarchical ID-based encryption scheme is secure under selective-ID attack in standard model.Furthermore,the notion of hierarchical proxy decryption is first proposed.Meanwhile,the security model and a generic construction method for proxy decryption are also presented.