hash

CSV into hash

由 时光毁灭记忆、已成空白 提交于 2020-01-03 16:54:45
问题 I have a csv with the first column a label followed by comma separated values: LabelA,45,56,78,90 LabelB,56,65,43,32 LabelC,56,87,98,45 I'd like the first column (LabelA etc) to be the Key in a hash with the numeric values in an array. I can read the file into an array or scalar but I'm not sure what to do after that. Suggestions?? Edit: Ok, so it looks like this assigns the value to a key ..but what about the comma delimited numbers in my example? Where are they going? Are they in %hash ? If

MD5碰撞后时代，MD5还有存在的意义吗？

由 [亡魂溺海] 提交于 2020-01-03 16:37:46
MD5是一种HASH函数，又称杂凑函数，由32位16进制组成，在信息安全范畴有广泛和首要运用的暗码算法，它有类似于指纹的运用。在网络安全协议中， 杂凑函数用来处理电子签名，将冗长的签名文件紧缩为一段一起的数字信息，像指纹辨别身份相同保证正本数字签名文件的合法性和安全性。在前面提到的SHA- 1和MD5都是现在最常用的杂凑函数。经过这些算法的处理，初始信息即使只更动一个字母，对应的紧缩信息也会变为大相径庭的“指纹”，这就保证了经过处理 信息的唯一性。为电子商务等提供了数字认证的可能性。 　　安全的杂凑函数在设计时有必要满意两个请求：其一是寻找两个输入得到相同的输出值在计算上是不可行的，这便是我们一般所说的抗磕碰的；其二是找一个输 入，能得到给定的输出在计算上是不可行的，即不可从效果推导出它的初始状况。现在运用的首要计算机安全协议，如SSL，PGP都用杂凑函数来进行签名，一 旦找到两个文件可以发作相同的紧缩值，就可以假造签名，给网络安全范畴带来无量危险。 　　MD5便是这样一个在国内外有着广泛的运用的杂凑函数算法，它曾一度被认为是非常安全的。但是MD5也不会完全不重复，从概率来说16的32次 方遍历后至少出现两个相同的MD5值，但是16的32次方有多大？3402823669209384634633746074317.7亿，就算全世界最 快的超级计算机也要跑几十亿年才能跑完。可是

Unable to create MD5 Hash file?

由 风格不统一 提交于 2020-01-03 13:21:05
问题 My error is : Error:Execution failed for task ':app:compileDebugJavaWithJavac'. Failed to create MD5 hash for file 'D:\Android\AsianNEws\PNRstatus\app\libs\httpclient-4.3.6.jar'. My Gradle file is : apply plugin: 'com.android.application' android { compileSdkVersion 25 buildToolsVersion "25.0.2" useLibrary 'org.apache.http.legacy' defaultConfig { applicationId "com.example.hp_pc.pnrstatus" minSdkVersion 21 targetSdkVersion 25 versionCode 1 versionName "1.0" testInstrumentationRunner "android

Julia: Immutable composite types

由 喜欢而已 提交于 2020-01-03 08:49:13
问题 I am still totally new to julia and very irritated by the following behaviour: immutable X x::ASCIIString end "Foo" == "Foo" true X("Foo") == X("Foo") false but with Int instead of ASCIIString immutable Y y::Int end 3 == 3 true Y(3) == Y(3) true I had expected X("Foo") == X("Foo") to be true. Can anyone clarify why it is not? Thank you. 回答1: Julia have two types of equality comparison: If you want to check that x and y are identical, in the sense that no program could distinguish them. Then

Hash keys encoding: Why do I get here with Devel::Peek::Dump two different results?

由 别说谁变了你拦得住时间么 提交于 2020-01-03 07:08:11
问题 Why do I get here with Devel::Peek::Dump two different results? #!/usr/bin/env perl use warnings; use 5.014; use utf8; binmode STDOUT, ':encoding(utf-8)'; use Devel::Peek; my %hash1 = ( 'müller' => 1 ); say Dump $_ for keys %hash1; my %hash2; $hash2{'müller'} = 1; say Dump $_ for keys %hash2; Output: SV = PV(0x753270) at 0x76d230 REFCNT = 2 FLAGS = (POK,pPOK,UTF8) PV = 0x759750 "m\303\274ller"\0 [UTF8 "m\x{fc}ller"] CUR = 7 LEN = 8 SV = PV(0x753270) at 0x7d75a8 REFCNT = 2 FLAGS = (POK,FAKE

xkcd: Externalities

由 微笑、不失礼 提交于 2020-01-03 06:44:07
问题 So the April 1, 2013 xkcd Externalities web comic features a Skein 1024 1024 hash breaking contest. I'm assuming that this must be nothing more than a brute force effort where random strings are hashed in an effort to match Randall's posted hash? Is this correct? Also, my knowledge of Skein hashing theory is virtually non-existent but being a halfway decent programmer I was able to download and run both SkeinFish (C#) and Maarten Bodewes Skein implementation (Java) locally in 1024 1024 mode

C++ unordered_map using a custom class type as the key

由 ぃ、小莉子 提交于 2020-01-03 05:08:16
问题 I am trying to use a custom class as key for an unordered_map , like the following: #include <iostream> #include <algorithm> #include <unordered_map> using namespace std; class node; class Solution; class Node { public: int a; int b; int c; Node(){} Node(vector<int> v) { sort(v.begin(), v.end()); a = v[0]; b = v[1]; c = v[2]; } bool operator==(Node i) { if ( i.a==this->a && i.b==this->b &&i.c==this->c ) { return true; } else { return false; } } }; int main() { unordered_map<Node, int> m;

Trying to port C# function to PHP5

由 匆匆过客 提交于 2020-01-03 03:44:12
问题 I'm trying to convert this function into PHP but somehow it does not give same results. public static string EncodePassword(string pass, string salt) { byte[] bytes = Encoding.Unicode.GetBytes(pass); byte[] src = Convert.FromBase64String(salt); byte[] dst = new byte[src.Length + bytes.Length]; byte[] inArray = null; Buffer.BlockCopy(src, 0, dst, 0, src.Length); Buffer.BlockCopy(bytes, 0, dst, src.Length, bytes.Length); HashAlgorithm algorithm = HashAlgorithm.Create("SHA1"); inArray =

Use alternate authentication in twisted's Perspective Broker

由 主宰稳场 提交于 2020-01-03 03:40:09
问题 I am using twisted's Perspective Broker for a network application. I encountered the problem that it automatically uses an MD5 challenge-response scheme for authentication. Ideally I would prefer not to store MD5 hashes on the server-side due to a number of security vulnerabilities. Alternatively, scrypt, bcrypt or pbkdf2 provide more secure algorithms. However, while these algorithms are readily available in python, I don't quite see, whether it is possible to implement a custom

Hash function for vector<double>

由 醉酒当歌 提交于 2020-01-03 02:30:18
问题 First, I am wondering if anyone knows of a hash function for vector representing an n-D vector? Second, is there a similar hash function where I can specify a resolution such that two "close" vectors hash to the same value? For example: given resolution r = 0.01 q1 = {1.01, 2.3} q2 = {1.01, 2.31} would hash to the same value. Thanks for the help! 回答1: Perhaps something like this would work for you? #include <stdint.h> #include <iostream> #include <vector> using namespace std; // simple
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