May 13, 2009 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. 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. ASP.NET can use Triple DES only on computers on which 128-bit encryption is available. If you add the IsolateApps modifier to the decryptionKey value, ASP.NET generates a unique encrypted key for each application using each application's application ID.

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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.

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

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<?xml version='1.0' encoding='UTF-8'?>
<configuration>
<system.web>
<machineKey decryptionKey='F6722806843145965513817CEBDECBB1F94808E4A6C0B2F2,IsolateApps' validationKey='C551753B0325187D1759B4FB055B44F7C5077B016C02AF674E8DE69351B69FEFD045A267308AA2DAB81B69919402D7886A6E986473EEEC9556A9003357F5ED45,IsolateApps' />
</system.web>
</configuration>

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You can copy it and paste it in the web.config file of all the servers in the webfarm.

As far as I remember you encrypt the message using public key and decrypt it using private key. My question is whether it is possible to get a public key from an RSA private key. For example if I h. Generate public and private key rsa. The public RSA key components (n, e) DO get generated with and are embedded into the private RSA key file created with openssl genrsa command. A separate public key file is not created at the same step though. Usage Guide - RSA Encryption and Decryption Online. In the first section of this tool, you can generate public or private keys. To do so, select the RSA key size among 515. Online RSA Key Generator. Key Size 1024 bit. 512 bit; 1024 bit; 2048 bit; 4096 bit Generate New Keys Async. RSA Encryption Test. Text to encrypt: Encrypt / Decrypt. To generate a set of RSA keys with PuTTYgen: Start the PuTTYgen utility, by double-clicking on its.exe file. For Type of key to generate, select RSA. In the Number of bits in a generated key field, specify either 2048 or 4096 (increasing the bits makes it harder to crack the key by brute-force methods.