Unique Encryption Keys 题目链接: http://acm.hust.edu.cn/vjudge/problem/26633 Description http://7xjob4.com1.z0.glb.clouddn.com/bced90d15c27e75270cc759651dcfa63 Input The input contains several cipher descriptions. Each description starts with one line co…

The security of many ciphers strongly depends on the fact that the keys are unique and never re-used. This may be vitally important, since a relatively strong cipher may be broken if the same key is used to encrypt several different messages. In this…

题目 题意:给m个数字, q次询问, 询问b到e之间如果有重复数字就输出, 没有就输出OK 思路:用f[i]数组 记录从i开始向后最近的有重复数字的 位置, 如 1 3 2 2, 则f[1] = 4; 如果离a最近的重复数字的位置 都大于b, 就说明没有重复数字. f[]数组需要预处理,从后向前. #include <iostream> #include <cstdio> #include <cstring> #include <vector> #inclu…

在数据库里面使用TRUNCATE命令截断一个表的数据时,遇到如下错误 SQL >TRUNCATE TABLE ESCMOWNER.SUBX_ITEM ORA-02266: unique/primary keys in table referenced by enabled foreign keys 有时候对应的中文错误提示为:ORA-02266: 表中的唯一/主键被启用的外部关键字引用,一般出现这个错误,是因为表中的主键被其它表的外键所引用,导致删除数据时出错. 此时,你可以通过下面脚本查看一下…

There are several occasions when the unique identifier of a device is required. For instance you need it to generate a serial key and unlock a trial version, to generate encryption keys or to have the unique signature of a device. On Android there ar…

在保密你的服务器和数据,防备当前复杂的攻击,SQL Server有你需要的一切.但在你能有效使用这些安全功能前,你需要理解你面对的威胁和一些基本的安全概念.这篇文章提供了基础,因此你可以对SQL Server里的安全功能充分利用,不用在面对特定威胁,不能保护你数据的功能上浪费时间. 从让人眼花缭乱的客户端使用连接,通过到处分布的网络,尤其是互联网,关系数据库在各种应用程序里广泛使用.这使数据对任何人,在任何地方都可访问.数据库可以保存人类知识的很大部分,包括高度敏感的个人信息和让国际商务工作的关…

1. What is TDE? Briefly speaking, TDE is used to encrypted data. 2. The benifits: Belows are come from Oracle Offical: As a security administrator, you can be sure that sensitive data is encrypted and therefore safe in the event that the storage medi…

先直接给解决方案: 点击A_I后,不要输入大小,直接点击执行!!! 分析 当你在使用phpMyAdmin 创建数据库表的时候,一般我们需要设置一个主键,然后让其自增长,但是有时候当你设置完成后,你可能会发现这样的错误: 1089 - Incorrect prefix key; the used key part isn’t a string, the used length is longer than the key part, or the storage engine doesn’t su…

Name ipsec.conf - IPsec configuration and connections Description The optional ipsec.conf file specifies most configuration and control information for the Openswan IPsec subsystem. (The major exception is secrets for authentication; seeipsec.secrets…

转自:http://webrtc-security.github.io/ A Study of WebRTC Security Abstract Web Real-Time Communication (abbreviated as WebRTC) is a recent trend in web application technology, which promises the ability to enable realtime communication in the browser w…