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Broadcast group-oriented encryption secure against chosen ciphertext attack

Journal of Systems Engineering and Electronics 2007年第4期18卷 811-817页

作者： Ma Chunbo Ao Jun Li Jianhua School of Information Security Engineering Shanghai Jiaotong Univ. Shanghai 200030 P. R. China The State Key Laboratory of Information Security Beijing 100049 P. R. China State Key Laboratory for Radar Signal Processing Xidian Univ Xi'an 710071 P. R. China

A novel broadcast encryption scheme for group communication scenarios in distributed networks is presented. In the scheme, anyone is allowed to encrypt a message and distribute it to a designated group. Each member in the designated group has the ability to independently decrypt a ciphertext. In contrast to traditional broadcast encryption, all the valid receivers in the proposed scheme compose the designated group. To take advantage of this property, a tab for the group is set and the matching private key for each member is generated. In addition, before decrypting a ciphertext, anyone in the scheme can verify the ciphertext, to ensure that the ciphertext is correct. This property is very important for large-scale group communication, as the gateway can filter incorrect ciphertext and alleviate the receiver＇s workload. Finally, a proof in the random oracle model is given, to show that the proposed scheme is secure against the adaptively chosen ciphertext attack.

关键词： broadcast group-oriented encryption chosen ciphertext attack public verification

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How to signcrypt a message to designated group

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The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 57-63页

作者： MA Chun-bo LI Jian-hua AO Jun School of Information Security Engineering Shanghai Jiao Tong UniversityShanghai 200030 China The State Key Laboralory of Information Security Beijing 100049 China AO Jun State Key Laboratory for Radar Signal Processing Xidian UniversityShaanxi 710071 China

In an open network environment, the protection of group communication is a crucial problem. In this article, a novel broadcast group-oriented signcryption scheme is presented for group communication scenarios in distributed networks, Anyone in this scheme can signcrypt a message and distribute it to a designated group, and any member in the receiving group can unsigncrypt the ciphertext. The ciphertext and public key in the scheme are of constant size. In addition, this new scheme offers public verification of the ciphertext. This property is very important to the large-scale group communication since the gateway can filter the incorrect ciphertext and alleviate the receiver＇s workload. Finally, a proof in the random oracle model is given to show that the scheme is secure against chosen ciphertext attack and existential forgery.

关键词： broadcast signcryption designated group chosen ciphertext attack existential forgery random oracle model

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