hash

Using hash of password to encrypt private key

由 冷暖自知 提交于 2020-01-02 03:48:05
问题 I am developing a web application in which I need to encrypt sensitive information. My plan is to use use AES-256 where the private key is encrypted by a hash of the user's password. I need to store the hash of the password for authentication purposes, but it obviously can't be same used to encrypt the private key. My current thought is to use bcrypt to generate a key to be used to encrypt the private key. For authentication, my thought was to simply hash the password using bcrypt and then

C# hashes

由 橙三吉。 提交于 2020-01-02 03:28:26
问题 I'm new to C# How do i hash files with C# What is available ? (md5, crc, sha1, etc) Is there an interface i should inherit? Basically i want to checksum multiple files and store it in a db along with using two of my own checksums/hashes. 回答1: 1.) How do i hash files with C#? You can utilize .NET classes under System.Security.Cryptography 2.) What is available? KeyedHashAlgorithm MD5 RIPEMD160 SHA1 SHA256 SHA384 SHA512 3.) Is there an interface i should inherit? No you don't have to. Take a

单页应用 SPA(Sigle Page Aolication)

由 ≡放荡痞女 提交于 2020-01-02 02:58:44
单页应用 SPA(Sigle Page Aolication) 优点： 1、具有桌面应用的即时性、网站的可移植性和可访问性。 2、用户体验好、快，内容的改变不需要重新加载整个页面，web应用更具响应性和更令人着迷。 3、基于上面一点，SPA相对对服务器压力小。 4、良好的前后端分离。SPA和RESTful架构一起使用，后端不再负责模板渲染、输出页面工作，web前端和各种移动终端地位对等，后端API通用化。 缺点： 1、不利于SEO。 2、初次加载耗时相对增多。 3、导航不可用，如果一定要导航需要自行实现前进、后退。 第一步：在主页面完成配置 <head lang="en"> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>主页面</title> <link href="css/bootstrap.min.css" rel="stylesheet"> <link rel="stylesheet" type="text/css" href="css/normalize.css">//每个模块都有的css都写在主页面 </head>

SPA 单页面应用程序。

由 好久不见. 提交于 2020-01-02 02:57:02
　　看到这个问题，先说下自己的理解到的程度，再去参考做修正，争取这一次弄懂搞清楚 　　自己的理解： 单页面应用程序，解决浏览器获取数据刷新页面的尴尬，通过ajax请求获取数据达到异步更新视图的按钮，原理的实现由两种， 　　其一，通过hash值的变化，绑定onhashchange的回调函数更新视图，因为hash值的变化不会让页面失去响应，不会向服务器发送请求。下面列出几种可能改变hash值的方法，改变url中的hash。浏览器回退按钮可能出现历史记录中的url包含的hash值不一样，都将触发该事件；还有触发带瑁点的链接改变，再通过js直接获取location.hash来改变导致事件触发。 　　其二，通过同H5 historyAPI 来添加向浏览器的历史栈中添加记录。过去的方法只有通过back,forward，go三个方法来实现前进后退和跳转。到H5多了pushState,replaceState方法。pushState只是单纯的添加并不跳转到该记录，而replaceState,替换记录整个历史记录的length长度不变化。 hitstory.pushState(data,title,url),向url里写入第一个参数数据，并指定title的值。执行完历史栈中添加了一条记录，通过执行一次popstate事件其中popstate用来监听历史记录的变化，可以理解为监听浏览器后退、前进的操作

How to check password manually in Asp.Net identity 2?

由 强颜欢笑 提交于 2020-01-02 02:17:08
问题 This might actually be more of a conceptual question. In Asp.Net Identity the PasswordHasher generates a different hash for the same string every time you do: new PasswordHasher.HashPassword("myString"); Now if for some reason I need to manually compare a user's input to the password saved in the database, I will most probably get a different string when I hash the user's entered password, than the one that is stored in the database. Can someone please explain this to me? Shouldn't hashing

Comparing long strings by their hashes

由 久未见 提交于 2020-01-02 01:54:48
问题 Trying to improve the performance of a function that compares strings I decided to compare them by comparing their hashes. So is there a guarantee if the hash of 2 very long strings are equal to each other then the strings are also equal to each other? 回答1: While it's guaranteed that 2 identical strings will give you equal hashes, the other way round is not true : for a given hash, there are always several possible strings which produce the same hash. This is true due to the PigeonHole

C# how to calculate hashcode from an object reference

由 半城伤御伤魂 提交于 2020-01-02 00:44:43
问题 Folks, here's a thorny problem for you! A part of the TickZoom system must collect instances of every type of object into a Dictionary<> type. It is imperative that their equality and hash code be based on the instance of the object which means reference equality instead of value equality. The challenge is that some of the objects in the system have overridden Equals() and GetHashCode() for use as value equality and their internal values will change over time. That means that their Equals and

聊一聊字节跳动的面试

由 烂漫一生 提交于 2020-01-01 20:26:37
作者：草木青川 链接：https://zhuanlan.zhihu.com/p/82871762 来源：知乎 著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。 lc里最长上升子序列的变形题。实现输入英文单词联想的功能二面：矩阵旋转，要求空间复杂度O(1)无序的数组的中位数。要求时间复杂度尽可能的小计算机网络tcp 怎么保证数据包有序1. 主机每次发送数据时，TCP就给每个数据包分配一个序列号并且在一个特定的时间内等待接收主机对分配的这个序列号进行确认，2. 如果发送主机在一个特定时间内没有收到接收主机的确认，则发送主机会重传此数据包。3. 接收主机利用序列号对接收的数据进行确认，以便检测对方发送的数据是否有丢失或者乱序等，4. 接收主机一旦收到已经顺序化的数据，它就将这些数据按正确的顺序重组成数据流并传递到高层进行处理。tcp 和 udp 的异同TCP是面向流的可靠数据传输连接UDP是面向数据包的不可靠无连接tcp 怎么保证可靠性差错检验机制，反馈机制，重传机制，引入序号，滑动窗口协议，选择重传tcp 中 拥塞避免 和 流量控制 机制拥塞避免和流量控制这两种机制很像，但是流量控制是由接收方的接受能力也就是接收窗口所决定的，如果接收窗口够大，以动态调整发送窗口的大小调整发送速度拥塞避免主要由网络情况所限制，网络情况良好，则加大发送速率，网络状态差（冗余ACK和丢包

Will this give a 128 bit Hash?

由 巧了我就是萌 提交于 2020-01-01 19:43:44
问题 MessageDigest md = null; try { md = MessageDigest.getInstance("SHA-1"); } catch(NoSuchAlgorithmException e) { e.printStackTrace(); } String hashToConvert = byteArrayToHexBigInt(md.digest(objectName)); /* * Converts to big Integer, will not be concatted because structure * is large enough to hold the Hash created * Second argument is set to 16 as this is the base for the parsing of the * hash to convert */ BigInteger bigHash = new BigInteger(hashToConvert, 16); return bigHash; } public static

How to store hashes in MySQL databases without using text fields

由 瘦欲@ 提交于 2020-01-01 18:27:29
问题 I'm storing unique user-agents in a MySQL MyISAM table so when I have to look if it exists in the table, I check the md5 hash that is stored next to the TEXT field. User-Agents { id - INT user-agent - TEXT hash - VARCHAR(32) // md5 } There is any way to do the same but using a 32-bit integer and not a text hash? Maybe the md5 in raw format will be faster? That will requiere a binary search. [EDIT] MySQL don't handle hash searches for complete case-sensitive strings? 回答1: Let MySQL do the hard
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