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    <p>Two problems here:</p> <p>A) Your protocol design is wrong. If you want to use RSA to exchange messages, the algorithm is this:</p> <p>A encrypts message using B's <strong>public</strong> key</p> <p>A sends the message</p> <p>B decrypts the message using B's <strong>private</strong> key</p> <p>(B does processing)</p> <p>B encrypts message using A's <strong>public</strong> key</p> <p>B sends the message</p> <p>A decrypts the message using A's <strong>private</strong> key</p> <p>and so on. Notice how A does not know B's private key, and vice versa. The public and private keys are related in such a way that a message encrypted with a public key (known to everyone) can only be decrypted with the corresponding private key (known only to the intendent recipient of the encrypted message). This is the whole point of RSA, actually.</p> <p>As for implementation in C#, it is quite trivial to do with the Crypto classes once you really understand the underlying concepts. See for example <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx" rel="nofollow">here</a> and <a href="http://www.codeproject.com/Articles/10877/Public-Key-RSA-Encryption-in-C-NET" rel="nofollow">here</a>.</p> <p>B) RSA is good for exchanging small amounts of data. It is meant for key exchange over an insecure channel without the need for a shared secret. For exchanging "normal" data, a symmetric algorithm such as AES is used. So the idea would be generating a random passphrase and IV from A, and sending that to B via RSA as discussed in A; after both parties know the passphrase and IV, they can just encrypt data using AES with the shared key. </p> <p>This is what SSL does, and you should have a really good reason to roll your own instead of using a standard SSL stream.</p>
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    1. POImplement secure communication using RSA encryption in C#
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    1. CO*"Notice how A does not know B's private key, and vice versa."* - I agree. But, notice how A does not try to access B's private key. A encrypts the message using 1) B's public key so that B can decrypt using its private key and 2) A's private key so that B can decrypt using A's public key and make sure it came from A.
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    2. COI know *SSL* and I prefer using it over any custom implementation. But, in my case, I am trying to create a working prototype that works for secure IPC communication. My prototype is targeting a single machine scenario.
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    3. COBut you're saying 'A encrypts X using A's private key' - that's not the way it works. The public key is used for encryption, the private one for decryption.
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