salt | 易学教程

How can I use salting+hashing on my ASP.Net application?

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问题 I'm building a project from the ground up and I want to do things the Right Way™. I've read online about hashes and that's basically turning a password in 64 letters of mumbo jumbo, correct? What about salting? My questions are: How do I hash a string using C#? What would the field declaration type be in MSSQL? nvarchar(64)? What is salting and do I need to save that somewhere in my database? If I intend to let people use Facebook Connect, do I need to worry about creating a hash/salt? Code

Salting Passwords

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问题 I could really use some clarification as to how using a random salt protects against rainbow table attacks. It just isn't clicking for me. Suppose there is a dumb application that requires passwords to be exactly five characters or less, and that salts those passswords with a nine-character random salt. If I have a rainbow table that has precomputed hashes of all character combinations 14 characters or less, how does the random salt provide any additional security? In this case won't the

How would you implement salted passwords in Tomcat 5.5

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问题 My web application is relying on container-managed security and I'm wondering if it's possible to use salted passwords at all. As far as I can tell it's easy enough to store digested passwords in a database by just configuring a JDBC or DataSource Realm, but there's no way to add a salt to those digest. Any suggestions? Edit: it seems I just need to think some more before asking questions ;-) It's just a matter of choosing who's doing the digest calculation (client or server) and configure

Client Side MD5 Hash with Time Salt

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问题 I want to salt a hashed username and password (submitted via http POST) in JS on the client-side with a higher-order time value (< 1 minute resolution) to avoid sending the username and password hash as a constant value that could be used for a log-in attempt via POST fabrication by an unauthorized user (i.e. a sniffer). This will impose a short expiry on the usefulness of the passed hash. If they inspect the JS and see that it uses this time salt, how much easier will it make the job of

Salted Hashed Password with Python (Different salt for every new password)

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问题 As far as my understanding after reading and researching, the purpose of using salt is supposed to be a different salt for every single password to be stored. If the same salt is used for storing all password, I can understand how to implement this, as I could just store the salt to a constant private variable and use it. But, that's not the case. Though it makes perfect sense for storing every new password with new different salt, but how do I suppose to know which user's password associated

Spring Security 3 + Random Salt

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问题 So I understand that you can check a password in Spring Security with salt based on a userDetail property and then hash it to compare to a hash in the database, however what if the salt used when creating each user is random (and is stored in the DB), would I need to create my own userDetails class that contains a salt property and then set that as the field spring security uses to salt with in the securityApplicationContext? If so how would I go about writing my own userDetails class to

Password hashing with true random salt or username salt plus pepper?

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问题 Consider the following two methods: hashedPassword = hash(trulyRandomSalt + password) Where hashedPassword and the trulyRandomSalt are stored in the database. hashedPassword = hash(applicationConstantPepper + uniqueUserName + password) Where the hashedPassword and uniqueUserName are stored in the database and the applicationConstantPepper is stored in the application config. Here, the uniqueUserName acts as a salt which are usually email addresses. I have read this question which has a lot of

使用BCrypt算法免除存储salt

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用户表的密码通常使用MD5等不可逆算法加密后存储，为防止彩虹表破解更会先使用一个特定的字符串（如域名）加密，然后再使用一个随机的salt（盐值）加密。特定字符串是程序代码中固定的，salt是每个密码单独随机，一般给用户表加一个字段单独存储，比较麻烦。 BCrypt算法将salt随机并混入最终加密后的密码，验证时也无需单独提供之前的salt，从而无需单独处理salt问题。用法很简单： //hashed就是明文密码password加密后的结果，存储到数据库 String hashed = BCrypt.hashpw(password, BCrypt.gensalt()); //candidate是明文密码，checkpw方法返回的是boolean if (BCrypt.checkpw(candidate, hashed)) System.out.println("It matches"); else System.out.println("It does not match"); BCrypt下载：http://www.mindrot.org/projects/jBCrypt/ 来源： oschina 链接： https://my.oschina.net/u/76091/blog/492885

Can someone point me to a good PHP/MySQL salted hashed password implementation?

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问题 After reading about salts password hashing Id like to implement a simple version for an admin area to a site Im building. If you have any good links with code that have implemented this idea well, I would appreciate it if you could share. Thanks, 回答1: Registration process: User enters a password. System generates a salt value from random data (could be a hash of the time & PID or something). Systems generates a hash value of the password & salt value and stores both of these in the

How store salt in distributed environment

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问题 I dont know how to use the "salt concept" in my scenario. Suppose I have a client desktop application that encrypts data for specific users and send it to a remote server. The client application generate a key with PKCS#5, with the user's password and a SALT. The remote desktop must NEVER be in contact with the user's password. Suppose we generate a random salt for an encryption. The client application can encrypt the data, and sent it to the remote server. If the user try to access his data