ID 原文 译文
45456 利用时空关联性，提出基于伪位置生成的隐私保护方案，在保护用户位置隐私的同时，考虑到空间和时间之间的关联性，选取与伪位置关联的伪查询内容。 A dummy-based location-preserving scheme was proposed, which took the correlation between spatial issues and temporal issues into account.
45457 时空关联的隐私保护方案包含 2 个算法，地图分割算法和伪内容生成算法。 Two algorithms were included in this scheme, map dividing algorithm and dummy contents determining algorithm.
45458 地图分割算法通过维诺多边形将地图划分为离散的位置单元，保证每一个离散的位置单元互不相邻， The map dividing algorithm divided the map into discrete lo-cation cells by Voronoi Diagram to ensure these discrete location cells were not adjacent to each other.
45459 伪内容生成算法利用用户在下一时刻将要前往的位置作为前一时刻的查询内容，从而很好地避免了攻击者根据时间和空间的关联性来推测用户的真实信息。 The dummy con-tents determining algorithm replaced the query content in previous moment by the intending location in next moment,which efficiently avoided the adversary inferring mobile users’ sensitive information according to the correlation between spatial issues and temporal issues.
45460 最后，通过实验证明所提方案的有效性和安全性。 The simulation experiments show that the proposed scheme is effective and efficient.
45461 云存储密文的静态性增大了攻击者通过获取密钥破解密文的概率，而基于密钥分发和重加密的密文密钥更新则开销过大。 The static property of stored ciphertext in cloud increases the probability that an attacker can crack the ciphertext by obtaining a key, while ciphertext and key updates based on key distribution and re-encryption are excessively expensive.
45462 针对此问题，提出一种支持高效密文密钥同步演化的安全数据共享方案（CKSE-SDS）， For this problem, a secure data sharing scheme supporting efficient synchronous evolution for ciphertext and key (CKSE-SDS) was proposed.
45463 通过在广播加密中引入密码学累加器构造支持时间周期性跳变的拟态变换因子，并基于密文及密钥的动态分割与融合实现高效的密文密钥同步演化，从而减少了加密过程和私钥分发的确定性，增大了攻击者利用安全漏洞获取密文密钥并破解密文的难度。 By introducing cryptography accumulator in broadcast encryption, mimicry transformation factor could be constructed supporting time-hopping periodically and efficient synchronous evolution for ciphertext and key could be achieved based on dynamic segmentation and fusion of ciphertext and key, which reduced certainty in the process of encryption and key distribution and increased the difficulty for attackers exploiting security vulnerabilities to obtain key to crack ciphertext as well.
45464 理论分析及安全性证明表明，该方案在支持数据安全高效访问条件下，可有效降低攻击者攻击成功的概率，提升系统的主动安全防御能力。 Theoretical analysis and security proofs show that the proposed scheme can support secure and efficient data access as well as reduce the probability of a successful attack effectively for an attacker, which can also enhance the system’s active security defense capability.
45465 在过去的几十年中，特征选择已经在机器学习和人工智能领域发挥着重要作用。 Feature selection has played an important role in machine learning and artificial intelligence in the past decades.