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Security and robustness are the main significant properties in watermarking system. In this paper, we propose an effective and secure certificateless public key watermarking scheme based on Singular Value Decomposition (SVD) and Discrete Wavelet Transform (DWT). The proposed method guarantees the non prior knowledge two parties to communicate covertly over an insecure and public channel. Moreover,...
In this paper, we propose a post-quantum secure cloud storage system supporting privacy-preserving public auditing scheme from lattice assumption. In our public auditing scheme, we introduce a third party auditor (TPA), which can efficiently audit the cloud storage data, bringing no additional on-line burden to the users. We utilize preimage sample able functions to realize our lattice-based signature,...
Recently, Yu et al. proposed two identity based signcryption schemes, one is an identity based signcryption scheme for multiple receivers and the other is an identity based signcryption scheme without random oracles. They showed their former scheme is secure against adaptive chosen ciphertext attacks and unforgeable in the random oracle model, and the latter scheme is secure against adaptive chosen...
A new concept called multi-proxy multi-signcryption is introduced in this paper. In a multi-proxy multi-signcryption scheme, a group of original signcrypters can authorize a group of proxy signcrypters under the agreement of all signcrypters in the original group. Then only the cooperation of all signcrypters in the proxy group could generate a multi-proxy multi-signcryption. We propose a multi-proxy...
Proxy blind signature is a cryptographic research hotspot, and has been applied in many occasions. Many proxy blind signature schemes were proposed, however, all the schemes rely on secure channels to transmit proxy secret key. Therefore, Lu, Cao and Zhou proposed a new proxy blind multi-signature scheme recently, which does not need a secure channel and is provably secure under the random oracle...
In a designated verifier proxy signature scheme, one can delegate his or her signing capability to another user in such a way that the latter can sign messages on behalf of the former, but the validity of the resulting signatures can only be verified by the designated verifier. Several designated verifier proxy signature schemes have been proposed so far. However, most of the schemes were proven secure...
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