Cryptology ePrint Archive: Report 2007/461

Verifiable Attribute-based Encryption

QiangTang and Dongyao Ji

Abstract: In this paper,we construct two veriable attribute-based encryption(VABE)schemes.One is with a single authority,and the other is with multi authorities.Not only our schemes are proved secure as the previous ABE schemes,they also provide a verication property.Adding the verication property has a few advantages:first,it allows the user to immediately check the correctness of the keys,if not,he only needs the authority to resend the corresponding shares,especially,in multi-authoritycase,if the key does not pass the check,the user only needs to ask the particular authority to resend its own part,without need to go to all the authorities,this saves a lot of time when error appears;second,if the keys pass the verication but the user still does not rightly decrypt out the message,something might be wrong with the attributes or ciphertexts,then,the user has to contact with the encryptor.We formalize the notion of VABE and prove our schemes in our model.

Category / Keywords: public-key cryptography /

Date: received 10 Dec 2007, last revised 10 Jul 2008

Contact author: qtang84 at gmail com

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Version: 20080711:020636 (All versions of this report)

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