Apr 17, 2017 ValidationKey and DecryptionKey under MachineKey configuration in Web.configRSS. ValidationKey and DecryptionKey under MachineKey configuration in Web.config. ValidationKey and DecryptionKey under MachineKey configuration in Web.config. Apr 17, 2017 03:41 PM santhoshnatarajan86. Jan 04, 2017 The property in web.config file configures algorithms and keys to use for encryption, decryption, and validation of forms-authentication data and view-state data, and for out-of-process session state identification.This encryption prevents tempering of session data on the server. Apr 17, 2017 Hi mgebhard, Thanks for your response. I understand the machineKey tag itself and its attributes. My question is lets say I have decided to use the 64bit (256bit - SHA256) key.
Web Config Machine Key
The machineKey element of the ASP.NET web.config 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. This works fine for applications that are deployed on a single server. When you use webfarms a client request can land on any one of the servers in the webfarm. Hence you will have to hardcode the validationKey and the decryptionKey on all your servers in the farm with a manually generated key.
Key word generation tool adwords. There are a lot of articles that describe how to use RNGCryptoServiceProvider to generate a random key. There are also a lot of online tools that generate random keys for you. But I would suggest writing your own script because any one who has access to these keys can do evil things like tamper your forms authentication cookie or viewstate.
With IIS 7 you no longer have to do this manually. The IIS 7.0 manager has a built in feature that you can use to generate these keys.
It uses RNGCryptoServiceProvider internally to create a random key. The value is stored locally in the web.config of that application something like
<?xml version='1.0' encoding='UTF-8'?>
<configuration> <system.web> <machineKey decryptionKey='F6722806843145965513817CEBDECBB1F94808E4A6C0B2F2,IsolateApps' validationKey='C551753B0325187D1759B4FB055B44F7C5077B016C02AF674E8DE69351B69FEFD045A267308AA2DAB81B69919402D7886A6E986473EEEC9556A9003357F5ED45,IsolateApps' /> </system.web> </configuration>
You can copy it and paste it in the web.config file of all the servers in the webfarm.
-->
SyntaxDescription
The New-MachineKey cmdlet creates a <machineKey> configuration element for use in the web.config file.The Initialize-MgmtSvcFeature cmdlet calls this cmdlet to generate the initial keys stored during configuration.
A machine key can be a validation key to confirm the integrity of data, or a decryption key to encrypt or decrypt forms authentication data.This cmdlet generates a value in memory.It is recommended that you periodically rotate the machine keys.For example, once per year.
Examples
Example 1: Create a machine key
This command creates a machine key configuration element by using the Hash-based Message Authentication Code (HMAC) SHA256 (HMACSHA256) for validation and the Advanced Encryption Standard (AES) encryption method for decryption.
ParametersWeb.config Machine Key Generator Manual
-Base64
Indicates that the validation and decryption values are Base64 encoded.
Specifies an algorithm to encrypt and decrypt forms authentication data.
Specifies a key size, in bits, of the algorithm used to encrypt and decrypt forms authentication data.
Machine Key Generator Web.config
Specifies a hash algorithm used to validate data.
Web.config Machine Key Generator For Sale
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