sha1 | 易学教程

PHP different one way hashes for password security

阅读更多关于 PHP different one way hashes for password security

问题 I was wondering to hash the password in PHP using different methods available and the combination of them for more and more security. I was wondering if this would work..? $pass = "***"; $salt = "!@)#%%@(#&@_!R151"; $pass = sha1($pass.$salt); $pass = md5($pass); 回答1: Rather than that, you can use a stronger hashing algorithm like sha512 with combination of a strong salt and UserID : Do it like this: echo hash('sha512', 'MyPassword' . $StrongSalt . $UserID); SHA512 is actually SHA-2 for which

How safely can I assume unicity of a part of SHA1 hash?

阅读更多关于 How safely can I assume unicity of a part of SHA1 hash?

I'm currently using a SHA1 to somewhat shorten an url: Digest::SHA1.hexdigest("salt-" + url) How safe is it to use only the first 8 characters of the SHA1 as a unique identifier, like GitHub does for commits apparently? To calculate the probability of a collision with a given length and the number of hashes that you have, see the birthday problem . I don't know the number of hashes that you are going to have, but here are some examples. 8 hexadecimal characters is 32 bits, so for about 100 hashes the probability of a collision is about 1/1,000,000, for 10,000 hashes it's about 1/100, for 100

Calculate SHA1 or MD5 hash in iReport

阅读更多关于 Calculate SHA1 or MD5 hash in iReport

问题 How would one calculate an SHA1 or MD5 hash within iReport at report execution? I need to compare a pre-calculated hash against a database driven field (string). Using iReport 2.0.5 (Old) and Report Engine is embedded into a commercial application. 回答1: I used iReport and Jasper Reports some years ago and I don't remember the details, but I remember that you could put in some way Java code to be evaluated. Using that feature you could calculate the MD5 in few lines: String encryptionAlgorithm

Working algorithm for PasswordDigest in WS-Security php

阅读更多关于 Working algorithm for PasswordDigest in WS-Security php

问题 I have been creating hash password from the formula given by my airline supplier. I have search on this site and I got the solution from below link in C# but I want in PHP. Working algorithm for PasswordDigest in WS-Security I have tried like this in php but password digest which I am getting is wrong function getTimestamp() { $microtime = floatval(substr((string)microtime(), 1, 8)); $rounded = round($microtime, 3); return gmdate("Y-m-d\TH:i:s") . substr((string)$rounded, 1, strlen($rounded))

Does i need different SHA1 key to perform Google Map

阅读更多关于 Does i need different SHA1 key to perform Google Map

问题 Hj. I am using google map API v2 for project. In my office, it works fine with cert_fingerprint key 1 But when doing it in home, i got a blank google map. Trace log i can see this: 03-17 04:40:44.288 12461-12510/com.dump.dms E/Google Maps Android API﹕ In the Google Developer Console (https://console.developers.google.com) Ensure that the "Google Maps Android API v2" is enabled. Ensure that the following Android Key exists: API Key: AIzaSyDEE3COcEWPZte_cpPl*********L2Cm_A Android Application (

SHA1 in Java and PHP with different results

阅读更多关于 SHA1 in Java and PHP with different results

问题 I know there are several questions like this around, but I tried every single solution I found on stackoverflow and I still haven't got the expected result. I'm trying to convert a string to sha1 in Java and PHP, but I'm getting different results. The string is generated randomly. I checked the string on both ends and they are the same (even trying a online comparison tool). This is the same code I use in another app and it's working there, but not in this case. One string I tried to hash

HMC SHA1 hash - Java producing different hash output than C#

阅读更多关于 HMC SHA1 hash - Java producing different hash output than C#

问题 This is a follow up to this question, but I'm trying to port C# code to Java instead of Ruby code to C#, as was the case in the related question. I am trying to verify the encrypted signature returned from the Recurly.js api is valid. Unfortunately, Recurly does not have a Java library to assist with the validation, so I must implement the signature validation myself. Per the related question above (this), the following C# code can produce the hash needed to validate the signature returned

Why would HMAC SHA-1 return a different digest with the same input?

阅读更多关于 Why would HMAC SHA-1 return a different digest with the same input?

问题 I am trying to build a working encrypted signature for the Amazon S3 web service, writing a connection library using Objective C. I have run into HMAC SHA-1 digest problems with the ObjC code, so I'm putting that to the side and looking at existing, working Perl code, to try to troubleshoot digest creation. I am testing HMAC SHA-1 digest output from the s3ls command of the Net::Amazon::S3 package and comparing that against the _encode subroutine that I pulled out and put into its own perl

Is it possible to decrypt SHA1 [duplicate]

阅读更多关于 Is it possible to decrypt SHA1 [duplicate]

This question already has answers here : Is it possible to reverse a sha1? (9 answers) Closed 5 years ago . Is it possible to decrypt(retain the actual string) the password which is saved in db using SHA1 algorithm. Example:If password is "password" and it is stored in db as "sha1$4fb4c$2bc693f8a86e2d87f757c382a32e3d50fc945b24" ,is any chance to retain the same "password"(string) from "sha1$4fb4c$2bc693f8a86e2d87f757c382a32e3d50fc945b24" SHA1 is a cryptographic hash function, so the intention of the design was to avoid what you are trying to do. However, breaking a SHA1 hash is technically

Is there an equivalent to SHA1() in MS-SQL?

阅读更多关于 Is there an equivalent to SHA1() in MS-SQL?

Converting a couple stored procedures from MySQL to Microsoft SQL server. Everything is going well, except one procedure used the MySQL SHA1() function. I cannot seem to find an equivalent to this in MS-SQL. Does anyone know a valid equivalent for SHA1() on MS-SQL? SQL Server 2005 and later has the HashBytes() function. If you want to get a SHA1 hash exactly as MySQL would generate it (i.e. as a varchar), you can combine HashBytes with sys.fn_varbintohexsubstring. E.g. SELECT sys.fn_varbintohexsubstring(0, HashBytes('SHA1', 'password'), 1, 0) See http://accessrichard.blogspot.co.nz/2010/12/sql