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Homomorphic equality test is a process, which was present in CRYPTO'2014 as a tool of bootstrapping in an FHE, called AP14, and been used to test whether the plaintext of a given ciphertext is equal to a certain element. In fact, this powerful function induced many new applications about homomorphic encryption, in theory and practice, especially when homomorphic comparison and arithmetic functions...
The traditional steganography methods with Pixel Value Differencing (PVD) usually only deal with the PVD in the horizontal direction but ignore the vertical one. In this paper, the cover image is divided into 2×2 nonoverlapping blocks, then the modulus function method is used in horizontal direction and the simple PVD method is used in vertical direction for steganography. In addition, the falling-off-boundary...
Compared to color and texture, contour is closer to human vision. So contour-based image retrieval has been a hot topic. However, existing methods can't obtain object contour effectively, which makes contour description and matching more difficult. To address these problems, this paper uses KPAC (Kernel-based Parametric Active Contour) to obtain the object contour, and proposes a novel method called...
In 1998, Blaze, Bleumer, and Strauss propose 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 opene under Bob's decryption key. In 2007, mainly motivated b making different types of ciphertext circulate smoothly in the network, Matsuo proposed the concept of four types of...
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