What Drives Click-Through Rates of Tourism Product Advertisements on Group Buying Websites?

AbstractObtaining stable customer base has become the key mission to the development of group-buying platforms, improving the CTR of product ads on group-buying platform is necessary for formation of stable customer base. This research uses the data about 54 relevant variables covering 7,991 group-buying products of 171 days which from a large tourism group-buying platform in China, and explores the influence factors of click-through rates of group-buying products. The results show that: product name, product discount-level, time pressure showed on product page has significant effect on the CTR of product

Cryptanalysis of the Randomized Version of a Lattice-Based Signature Scheme from PKC'08

International audienceIn PKC'08, Plantard, Susilo and Win proposed a lattice-based signature scheme, whose security is based on the hardness of the closest vector problem with the infinity norm (CVP∞). This signature scheme was proposed as a countermeasure against the Nguyen-Regev attack, which improves the security and the efficiency of the Goldreich, Goldwasser and Halevi scheme (GGH). Furthermore, to resist potential side channel attacks, the authors suggested modifying the determinis-tic signing algorithm to be randomized. In this paper, we propose a chosen message attack against the randomized version. Note that the randomized signing algorithm will generate different signature vectors in a relatively small cube for the same message, so the difference of any two signature vectors will be relatively short lattice vector. Once collecting enough such short difference vectors, we can recover the whole or the partial secret key by lattice reduction algorithms, which implies that the randomized version is insecure under the chosen message attack