RE: Stream based RSA encryption?

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OOB means? Object Oriented Base?
--
Thanks,
Nick

nicknospamdu@xxxxxxxxxxxxxxxx
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""Steven Cheng"" wrote:

Hi Nick,

Yes, your conclusion is correct. Generally for large amount of data,
symmetric encryption is used due to performance consideration. And the
symmetric encryption key(we call it session key) is further secured via
asymmetric (such as RSA or DSA) encryption. The encrypted session key
itself is attached with the message body(encrypted via session key) just
like a message header(so that it can be decrypted later at receiver side.

Also, start from .NET 2.0, windows encryption (symmetric, asymmetric or
certifcicate based ..) have been much simplified via more OOB classes. You
can

http://www.codeproject.com/KB/security/SimpleEncryption.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


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--------------------
From: =?Utf-8?B?bmlja2R1?= <nicknospamdu@xxxxxxxxxxxxxxxx>
References: <19967398-D4D8-4246-8EF5-71F5C01BF8EB@xxxxxxxxxxxxx>
Subject: RE: Stream based RSA encryption?
Date: Sun, 11 Jan 2009 12:26:24 -0800


After reading some more in the cryptography section I see that asymetric
key
encryption is not meant to be used on large amounts of data. Instead you
should use public key encryption to encrypt a symetric key and
encrypt/decrypt using the symetric key.

That being said, if I want to encrypt data that will be stored, like in a
file or in the DB, I'm thinking I should do it as follows:

1. Create a symetric key.

2. Encrypt the symetric key with a public key.

3. Store the encrypted symetric key in the stream of encrypted data.

4. Encrypt the stream of data with the symetric key.

When I need to decrypt:

5. Decrypt the symetric key with the private key.

6. Decrypt the rest of the stream with the symetric key.
--
Thanks,
Nick

nicknospamdu@xxxxxxxxxxxxxxxx
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"nickdu" wrote:

Is there a stream based mechanism for encryption/decryption using the
RSA
algorithm? I found CryptoStream but so far I don't see that RSA works
with
CryptoStream.
--
Thanks,
Nick

nicknospamdu@xxxxxxxxxxxxxxxx
remove "nospam" change community. to msn.com



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