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I am trying to encrypt and then decrypt files using asymmetric encryption. I've created a test certificate using makecert and installed it into my personal localmachine store. In future I'll have to install this certificate on several servers, that's why I've created it with "-pe" flag, that is, with exportable private key. The certificates has been successfully created and installed, I see the "You have a private key that corresponds to this certificate" note in mmc. Now I am trying to encrypt data with RSACryptoServiceProvider in .NET 3.5. And it succeeds. But when I am trying to decrypt it, I get "Bad key" exception. If I create the certificate without "-pe" option, the same code works well for decryption. Here is the code: RSA rsaKey = (RSA)myCertificate.PrivateKey; RSACryptoServiceProvider rsaCsp = (RSACryptoServiceProvider)rsaKey; byte[] plainText = rsaCsp.Decrypt(encryptedText, true); Also I've tried another method, using System.Security.Cryptography.Pkcs namespace: EnvelopedCms envelope = new EnvelopedCms(); envelope.Decode(encryptedText); envelope.Decrypt(); byte[] plainText = envelope.ContentInfo.Content; The result was the same... Can anyone help?

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