沪宁高铁防灾安全监控

防灾安全监控系统主要是针对危及客运专线列车安全的自然灾害(风、雨)、异物侵限及非法侵入进行监测报警,提供经处理后的灾害预警、限速、停运等信息。它为列车调度员进行列车运行计划调整,发布行车限速、抢险救援等命令提供依据,保证列车运行安全。     

旅客列车防撞措施

铁路旅客列车冲突,造成乘客伤亡,是铁路安全的要害。最近,英国汽车工业研究会的一项调查研究指出,如果把日前用于汽车的安全技术用于火车,许多铁路撞车事故的伤亡是可以防止的。     

Improved preimage attack on 3-pass HAVAL

HAVAL is a hash function proposed by Zheng et al. in 1992, including 3-, 4- and 5-pass versions. We improve pseudo-preimage and preimage attacks on 3-pass HAVAL at the complexity of 2¹⁷² and 2^209.6, respectively, as compared to the previous best known results: 2¹⁹² and 2²²⁵ by Sasaki et al. in 2008. We extend the skip interval for partial-patching and apply the initial structure technique to find the better message chunks, and combine the indirect-partial-matching, partial-fixing and multi-neutral-word partial-fixing techniques to improve the attacks based on the meet-in-the-middle method. These are the best pseudo-preimage and preimage attacks on 3-pass HAVAL.     

关于铁路基本建设投资时序的探讨

对铁路建设项目投资时序进行了探讨，提出投资时滞这一新的概念。介绍了铁路建设项目投资时滞的计算，介绍了铁路建设项目投资时滞的计算方法，并结合实例进行了计算。     

On the security of multivariate hash functions

Multivariate hash functions are a type of hash functions whose compression function is explicitly defined as a sequence of multivariate equations. Billet et al designed the hash function MQ-HASH and Ding et al proposed a similar construction. In this paper, we analyze the security of multivariate hash functions and conclude that low degree multivariate functions such as MQ-HASH are neither pseudo-random nor unpredictable. There may be trivial collisions and fixed point attacks if the parameters of the compression ftmction have been chosen. And they are also not computation-resistance, which makes MAC forgery easily.     

一种嘉年华心情

嘉年华在欧洲是一个传统的节日,最早起源于古埃及,后来成为古罗马农神节的庆祝活动。嘉年华是英文单词Carnival的中文译音,我不得不承认这个中文名字翻译得非常好。其实Carnival源于《圣经》中的一个故事:有一个魔鬼把耶稣困在旷野里,40天没有给耶稣吃东西,耶稣虽然饥饿,却没有接受魔鬼的诱惑。后来,为     

FORESTER 2.5XS 慢行舒缓,不再增压

人气crossover SUV斯巴鲁森林人,新添了2.5升自然吸气引擎车型。从前只有稍微孱弱的2.0升自然吸气型号,以及性能取向的2.5T涡轮增压型号。从今以后,阵容均衡齐整了很多。     

电子束辐照对钢渣易磨性的影响

针对钢渣利用中易磨性差难以细磨的问题,利用电子束对不同矿物聚集体颗粒的选择性解离的特点,对钢渣进行电子束辐照,发生电击穿,产生细微裂隙体系,使矿物结合强度降低和提高后续磨矿的效率,强化了颗粒之间的选择性解离促进钢渣粉磨.