Re: Encryption always returning a different value with same key?

From: Michel Gallant (neutron_at_istar.ca)
Date: 10/28/05

  • Next message: sunit: "Re: AcquireCredentialsHandle returns SEC_E_UNKNOWN_CREDENTIALS" 
    Date: Fri, 28 Oct 2005 11:01:40 -0400

    That is normal, for RSA encryption.
    The most common format for the data block, before actual encryption with
    the RSA public key, a PKCS #1, type 2 encryption block is used which contains
    random padding data. Having random padding data prevents someone from guessing
    the encrypted data by using the public RSA key and testing for an identical
    encrypted result.

    Here is a simple but useful description of the process:
        http://msdn.microsoft.com/library/default.asp?url=/library/en-us/seccrypto/security/simple_key_blobs.asp

    - Mitch Gallant
       MVP Security

    "bender" <bender@discussions.microsoft.com> wrote in message news:3CAC695C-F32D-4C96-9E3C-371589CFF752@microsoft.com...
    >I have created a CALG_RSA_KEYX BLOB and imported it. On each encryption run
    > (using the exact same key BLOB data) I get a different value returned for my
    > cipher text.
    >
    > I do not understand this, should each run with the same plain text, and the
    > same key not return the same cipher text?

  • Next message: sunit: "Re: AcquireCredentialsHandle returns SEC_E_UNKNOWN_CREDENTIALS"

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