Bob Ollila wrote:
>
> I would like to use DSA as a means of limiting use of a piece of software to those
>with appropriate permission. Here's how it would work: A user of the software is
>given a password which consists of an ipaddress where his app is to run encrypted
>using the private key. When the app runs it uses the public key to decrypt the
>password and verify the the localhost is a licensed user of the app.
DSA is not an encryption algorithm it is a signing only algorithm. As
such there aren't any export restriction on key size.
However your application could just as easily work with a signature. For
example the app would contain the relevant info and a signature and then
verify the signature against a hard coded public key.
Steve.
--
Dr Stephen N. Henson. http://www.drh-consultancy.demon.co.uk/
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