VS 2008 - Encrypt File Data Using Certificates

Sep 12, 2011

There is an existing classic ASP application that uses CAPICOM to encrypt a file's content using a certificate. A new file is created with the encrypted content and put on a location from where another 3rd party web application picks up the file (with encrypted content). They use the certificate to decrypt the encrypted data .

I am re-writing this piece of the software in ASP.Net and have read a bit about the encryption algos in .Net. But I am unable to come to a solution I am aiming for.

My questions:
a.) CAPICOM and .Net encryption? Any resource that has some sort of method mapping between the two?

b.) How to encrypt the content of a file using a certificate's private key? The reason I'm looking for this is this statement

The Sign method creates a digital signature on the content to be signed. A digital signature consists of a hash of the content to be signed that is encrypted by using the private key of the signer.

Source: [URL] ....

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