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Traceable Ciphertet-Policy Attribute-Based Encryption with Constant Decryption
( Guangbo Wang ),( Feng Li ),( Pengcheng Wang ),( Yixiao Hu ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.9
We provide a traceable ciphertext-policy attribute based encryption (CP-ABE) construction for monotone access structures (MAS) based on composite order bilinear groups, which is secure adaptively under the standard model. We construct this scheme by making use of an "encoding technique" which represents the MAS by their minimal sets to encrypt the messages. To date, for all traceable CP-ABE schemes, their encryption costs grow linearly with the MAS size, the decryption costs grow linearly with the qualified rows in the span programs. However, in our traceable CP-ABE, the ciphertext is linear with the minimal sets, and decryption needs merely three bilinear pairing computations and two exponent computations, which improves the efficiency extremely and has constant decryption. At last, the detailed security and traceability proof is given.
Quantum Coherent Dissociation in a Hybrid Atom-light System with Photon Loss
Xiaoyang Yuan,Jialu Yin,Jiahao Xu,Yixiao Huan,Zhengda Hu 한국광학회 2024 Current Optics and Photonics Vol.8 No.1
We investigate the effect of photon loss on pair production in a hybrid atom-light system. The loss of light field not only affects the generation of photons, but also prevents the generation of atomic collective excitation, although the atoms are not influenced directly. We propose an unbalanced homodyne detection of the number of atomic collective excitation that overcomes the challenge caused by counting uncertainty in practical measurement. In discussion, we show that the intermode correlations and the number correlation is closely related to the initial input state, while the quadrature correlations are independent of the initial state and always exhibit opposite intermode correlations even in the presence of loss.