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These years attribute based encryption (ABE) is a very hot research topic for its very flexible control on the encrypted content. Typically, there are three parties in an attribute based encryption system: PKG, User (Decrypter), Encrypter. The PKG (Private Key Generator) is responsible to generate secret keys for the User (Decrypter) according to the attributes (CP-ABE) or the policy (KP-ABE), then...
In this paper, we propose an energy-efficient and secure channel group key establishment and rekeying management scheme for mobile IPTV service. Compared with traditional IPTV service, mobile IPTV is much more vulnerable to various attacks, and membership management is more complicated because of the user mobility. Our scheme provides a group key management mechanism that supports authentication between...
Proxy re-encryption, introduced by Blaze et al. in 1998, allows a proxy to transform a ciphertext computed under Alice's public key into one that can be opened under Bob's decryption key. An open problem of constructing (bidirectional or unidirectional) IND-PRE-CCA2 secure proxy re-encryption scheme in the standard model yet without pairings was left until now. In this paper, based on Hanaoka's efficient...
In 1998, Blaze, Bleumer, and Strauss proposed a kind of cryptographic primitive called proxy re-encryption. In proxy re-encryption, a proxy can transform a ciphertext computed under Alice's public key into one that can be opened under Bob's decryption key. In this paper, with the help of the PKG, we construct a CCA-secure identity based proxy reencryption scheme based on a variant of BBi identity...
This paper introduces a new (t, n) secret sharing scheme for image encryption. The proposed method encrypts the secret image into two images as the same size of the original image, which one is the public image (called the encrypted image) and another is to be shared among n participants using a new secret sharing method based on the Shamir’s secret sharing. In the new secret sharing scheme, t (or...
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