Hashing Vs. Encrypting Passwords?
Feb 9, 2011
I'm using ASP.NET membership for a site that will serve primarily sophisticated users. I understand the difference between hashed and encrypted passwords, and I'm trying to decide between the two.After my last client complained bitterly about hashed passwords being a total PITA, I've started to favor encrypted passwords. But someone suggested this just isn't secure enough.So my question is: What, exactly are the risks of encrypting passwords? Any person with the ability to steal passwords by decrypting them from the database would surely have the ability to reset them if they were hashed, no? I'm having trouble seeing where someone could cause trouble with encrypted passwords but couldn't with hashed ones. Making it convenient for users is also important.
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Similar Messages:
Feb 8, 2010
Before I continue I'm going to let everybody know that I am not trying to follow a traditional .Net Membership Provider. I'm attemping to write my own Membership Provider which does not extend the default .Net Membership Provider b/c I feel that in areas it can become extremely cumbersome. Please keep this in mind before responding. Also keep in mind that I am trying to learn from this experience, not find an easy solution for some client's application.I am writing a custom membership provider that has password formatting functionality similar to .Net's default membership provider. I'm looking for soe good/easy examples of ways to encrypt/decrypt or hash password values. I previously tried going the RSA route, but got stuck when I had to Import an RSAParameter and was unsure of how to generate a RSAParameter.
I would like to have both Hashing and Encryption available, but only need Encryption. I'm also looking for a very strong encryption. I'm storing the password format in an external .xml file (similar to how the web.config stores the password format for .Net's Membership Provider) which will become manageable from the administrative side of my webapplication.If anybody knows of any existing Encryption libraries that may provide assistance, please feel free to post links. I only ask that they be open source solutions so I can see how they went about doing this.
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Aug 5, 2010
found while searching for help on my asp.net application.I have a small application with connected to a SQL database. As it was so small, and contained very little data of any importance, i had set it up with Clear passwords.Now i have been asked to expand the database considerably, and encrypted passwords are now required. I can easily modify the web.config so all future users are set up with encrypted passwords. But is there any way to change all existing users passwords to be stored encrypted?
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Nov 1, 2010
I want the login password to not be sent in plaintext (due to the risk of hijacking). I know that this can be achieved in principle using MD5 or the like, but is there a common implementation for use with Asp.Net? Of course, it's crucial that the resulting hash (?) isn't easy to decrypt. When I read various posts on this matter, some people say it's just to do a reverse on the encrypted string, so that in effect, this is totally useless.
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Mar 9, 2011
I seem to be having some difficulty working out how to encrypt the user's password at the time they register for an account. To ensure that I am storing the password securely, I would like to be able to encrypt the password before it is inserted into the database.
When the user logs in I can then encrypt their password at log in time and compare this to the encrypted password in the database, meaning that the password in the database never needs decrpyting.
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Mar 4, 2011
I have been killing myself over this for a couple weeks now and cannot find a viable solution. Here's my scenario:
I have a DTSX package that imports user data from an external database. It then creates user accounts and profiles in the local database. Users can also be created via a custom ASP.NET Membership Provider. The provider must be able to authenticate both types of users.
This was all fine and dandy during development because passwords were stored as clear text. However, now that we're ready for release the passwords format of the provider must be set to encrypted and so the users created via the DTSX must be created with an encrypted password. (I'd prefer the passwords were hashed but the client's requirements are that passwords be recoverable). The real problem seems to be creating an encrypted password within the DTSX that will be decryptable by the ASP.NET Membership Provider.
My original solution was to have the DTSX call a CLR stored procedure that had access to the same encryption logic as the provider. I got it working but our client wouldn't enable CLR integration. So that's out the window. Now I'm investigating alternatives. One alternative is to simply use the built-in encryption methods of T-SQL. But how do I share the keys used for the encryption/decryption?
My question is, is it possible to generate a password in T-SQL, say using EncryptByKey, that will also be decryptable by my provider? This means that the key in SQL must match the key in my machineKey configuration.
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Aug 4, 2010
My issue today is that i have a MySQL Database and am using the security framework provided by the ASP.NET Membership and Role Providers...I override the default methods with my own MySQL.
Now the issue comes in when i someone would like to have their password reset. My application is running entirely on an Intranet so i cannot have their passwords emailed to them. Is there a way i can have this information displayed in any way so that the user can use it to Log Reset, Create Accounts or Recover their lost passwords on an intranet without the administrators intervention?
Recently i had an approach as follows. In my web.config<system.net><mailSettings><smtp deliveryMethod="pickupDirectoryLocation" and my location was a folder on C drive as c:/SavedPasswords. Now i understand this was such a big security threat and thats why i am looking for a better option.
I would have that folder created using my System.IO and then the Mail is dropped into that folder. Then after the process is successful, i tell the user to check into that location and Read its content.
Then there is a global variable that is set to true...meaning that the folder at c:/ has been created. then there is a Method in a certain class that once it sees this variable True, it reads the readers c:/ and deletes that folder "save" if it exists;
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Aug 4, 2010
I have a small database, with a very small number of users. The passwords were stored as clear as the database was so small and held no sensitive data. The database is now to be expanded and passwords are required to be encrypted. I can change the Password Format in the web.config, but is there a way to change the existing passwords from clear to encrypted?
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Feb 11, 2010
I'm administrating servers running IIS 6, hosting a website on ASP.NET 2.0. Yesterday I installed .Net framework 3.5, and all my user authentication system was lost. Users can't log in, because their password arn't getting authenticated, maybe because the hash function has changed in 3.5??? I can't really get to the code, but I know it uses an extention called CodeSmith.Do you know of any break my upgrade the 3.5 ugrade could couse?
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Feb 7, 2010
I'm just wondering if the built in Hashing in the ASP.Net membership good password security, or if there is more that I should do to protect my passwords? If so, what should I look into for a higher level of security?
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Feb 9, 2010
I'm trying to optimize my ASP.NET thumbnailing script, so it doesn't resize all the images all the time, and one part of the problem is choosing the hash function for the thumbnail naming/checking procedure.Is crc32 up to the task - I'm asking cause the input data is small(only relative path, size and date)?
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Feb 8, 2011
So, I am the approach David Hayden posted on his blog [URL] to create a salt and hash the user's password by taking the user's raw password and the generated salt and using SHA1 to hash the value. I then store the salt and the hashed password in the database. zhe website is currently load balanced, so I was wondering if resulting hash value would be the same for both servers. Here is the snippet of code posted on David Hayden's blog:
private static string CreateSalt(int size)
{
//Generate a cryptographic random number.
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] buff = new byte[size];
rng.GetBytes(buff);
// Return a Base64 string representation of the random number.
return Convert.ToBase64String(buff);
}
private static string CreatePasswordHash(string pwd, string salt)
{
string saltAndPwd = String.Concat(pwd, salt);
string hashedPwd =
FormsAuthentication.HashPasswordForStoringInConfigFile(
saltAndPwd, "sha1");
return hashedPwd;
}
The reason I ask is that this code uses the code snippet: FormsAuthentication.HashPasswordForStoringInConfigFile(saltAndPwd, "sha1");
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Jan 5, 2010
I am planning to write a custom 'password reset control' that allows an Administrator to reset the user's password, while using the ASP.NET built-in 'login' and 'create new user' controls. For this reason, I will need the hashing algorithm (hopefully I can call some .NET class and method) to perform this.
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Aug 31, 2010
I am using ASP.NET 3.5 and SQL Server 2005.currently while creating users, the password will be stored in the database using SHA256 algorithm. And in the Log In time entered password will be hashed with a salt and this salted password only transmitted through network (javascript). This is for incresing security without using SSL connection.I am planning to use ASP.NET 3.5 login controls How can I use client side hashing (SHA256 salted hashing) along with ASP.NET Login Controls. And also each login attempt should be logged, in a separate database table with IP address, user agent and so on.
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Jun 23, 2010
I want to apply some better security measures to an existing web application. Currently, my connection string contains the user name and password in plain text. I'm also using a custom membership provider, which stores user names and passwords in the web.config file as plain text [URL] I would like to secure this information using an algorithm such as SHA1.
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Oct 21, 2010
So I'm in the process of writing an ASP.NET application that requires to import users from a PHP application. The passwords were hashed using MD5 into the database, so the user table records looks more or less like this:
user Password
user1 827ccb0eea8a706c4c34a16891f84e7b
user2 e10adc3949ba59abbe56e057f20f883e
And so on. I have access to the PHP source code and I can see that there is no salt or anything else, it is juts a straight MD5 application. Now, Back on my ASP.NET, I tried to use MD5 using the following logic:
[Code]....
Problem is, that is returning strings like 50-F8-4D-AF-3A-6D-FD-6A-9F-20-C9-F8-EF-42-89-42, which of course is not going to match with the information in the database. What should I do so I don't have to reset 500+ user passwords?
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Oct 12, 2010
I have been trying to encrypt password and found a code which is working with Access fine but as i have changed to SQL it is not decoding the encrypted text.. it amazes me..this SQl code is not letting me log on..
[Code]....
Whereas this OlebDB/Access is working fine
[Code]....
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Aug 24, 2010
i'm working on already built asp.net webapplication. in the web.config for connectionString section i have seen this
<add name="MyConnectionString" connectionString="3abcde12n3kd03kldwqaswe45tdw4fo23003ld3ddfot0lkdpe2d" providerName="System.Data.SqlClient"/>
can anyone tell me on how this encryption done? i know the standard way of encrypting using aspnetregiis.exe which replaces the entire connnectionString section of the web.config.
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Apr 4, 2011
would please someone guide me how to encrypt and decrypt cookies in Asp.net 2.0.
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May 3, 2010
I am wondering how to encrypt the below information in the "web.config" file of the "Account" folder (where we have the secured pages):
[Code]....
My issue here is that even after I compiled my application (using "aspnet_compiler -v /reports c:
eports"), the information inside the web.config file of the Account folder still not encrypted, and I want to publish my site to the customer server. So, since this server is a customer server, then they can access this "web.config" file and change our web-application security behaviour (correct me if I am wrong). Basically, I don't want the customer to even have access to our secured pages when they access our web-application using the web browser. How to solve this issue?
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Aug 17, 2010
I used the article Creating a Flexible Configuration Section Handler to create a Flexible Configuration Section Handler in my application.
I also saw this article entitled Encrypting Custom Configuration Sections on the OdeToCode blog, on how to encrypt portions of a web.config file.
From the first article, we have this web.config code.
[code]...
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Aug 26, 2010
I am getting the error "An error occurred loading a configuration file: Access to the path is denied."
When I am in VS 2010, I can Encrypt as long as I run as administrator. Code as follows:
[Code]....
My problem is I need to run this in IIS. What is stopping me? It's a permission problem, but what permission. I am running IIS 7.5 on Windows 7. This is happening on my production server as well. Same error.
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Mar 9, 2010
Is there any tools available to encrypt and decrypt Asp.net Web configuration sections like connection string ,etc.?
Can i get any add-on for this?If i use Enterprise Library i can do so,but without that is there any simple utility available?
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Nov 7, 2010
I just came across some code that seems to encrypt database keys prior to sending them to the client (WebBrowser, Silverlight, etc).
To illustrate, suppose you have a list of students to extra-curricular activities, and a relationship defined between them. Every time the data is written out to the ASPX page, the studentID and activityID is encrypted. Every time a write, or modify is made, this value is sent back to the server, decrypted, and saved to the database.
What could be the reasons to expose data this way? Is this a normal practice?
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Feb 4, 2011
Any section in my web.config file that I want to encrypt I run this command line util:
aspnet_regiis -pe "anySection" -app "/SampleApplication"
It all works just fine until I try encrypt my connectionStrings sections
I define (and I cannot change this) my connectionStrings section like this:
[code]....
Is there a way of doing this using the aspnet_regiis util? Doing it with code is not an option for me.
Also is there a way to run this untility without specifing the application (-app "/SampleApplication") instead giving the path to the web.config file?
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