1. Asp.net Encryption Key Generator Reviews

AES Encryption (Machine Key) not validating user on IIS

  • To enable the machine key works with the form authentication successfully, you may need to keep all the server use the same encryption and decryption key. You may also need to use generate keys button in action panel to generate the key manually, then you need to copy the key to all the server manually. Best Regards, Yuk Ding.
  • Jun 17, 2013  Encrypt, decrypt and generate a key in C# using AES256. encryption.cs. Encrypt, decrypt and generate a key in C# using AES256. encryption.cs. Skip to content. All gists Back to GitHub. Sign in Sign up Instantly share code, notes, and snippets. Haeky / encryption.cs. I use ASP.NET applications. Test your code. Static void Main(string.

Jul 14, 2017 12:05 PMRohit RaoLINK



What Is Machine Key? The machineKey element in the ASP.NET web.config file specifies the algorithm and keys that ASP.NET will use for encryption. By default the validationKey and the decryptionKey keys are set to AutoGenerate which means the runtime will generate a random key for use. (plaintext) combined with (encryption key) = encrypted cyphertext The first item of business is to generate a key. We'll generate one that is 512 bytes in length, which should be plenty for encryption of a text string. Here is the key generation code.

I am using Asp.net membership in my application. We were using SHA256 for validation and 3DES for decryption (Asp.net membership) in machine key in Web.config.

Now my requirement is to use AES encryption for both. I created Keys from IIS and added in my Web.config.


Using That configuration setting, i updated password of 1 of my user in development environment.

MembershipUser mu = Membership.GetUser('UserName');
mu.ChangePassword(mu.ResetPassword(), 'Password');

After that i ran the application to test my password on development machine using below code & it was returning true:

bool b = Membership.ValidateUser('UserName', 'Password');

But when i published the website on IIS on my local machine, It is returning FALSE.

I am not sure why it is happening as the same keys are used at both places.



You may generate an RSA private key with the help of this tool. Additionally, it will display the public key of a generated or pasted private key.


RSA is an asymmetric encryption algorithm. With a given key pair, data that is encrypted with one key can only be decrypted by the other. This is useful for encrypting data between a large number of parties; only one key pair per person need exist. RSA is widely used across the internet with HTTPS.

To generate a key pair, select the bit length of your key pair and click Generate key pair. Depending on length, your browser may take a long time to generate the key pair. A 1024-bit key will usually be ready instantly, while a 4096-bit key may take up to several minutes. For a faster and more secure method, see Do It Yourself below.

CryptoTools.net does not yet have a tool for facilitating the encryption and decryption of data using RSA, but you may Do It Yourself with the instructions below.

Do It Yourself

For these steps, you will need a command line shell with OpenSSL. Ideally, you should have a private key of your own and a public key from someone else. For demonstration, we will only use a single key pair.

Generate Private Key

Run this command to generate a 4096-bit private key and output it to the private.pem file. If you like, you may change the key length and/or output file.

Derive Public Key

Given a private key, you may derive its public key and output it to public.pem using this command. (You may also paste your OpenSSL-generated private key into the form above to get its public key.)

Encrypt Data

We can now use this key pair to encrypt and decrypt a file, data.txt.

Decrypt Data

Asp.net Encryption Key Generator Reviews

Given the encrypted file from the previous step, you may decrypt it like so.

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