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. Here are some
related questions for the crypto-gurus:
1. If I understand correctly, the minimum private key size with DSA is 512 bits. What
are the current export restrictions on this kind of encryption? Is it possible to use
a smaller key with DSA?
2. The OpenSSL command line tools for generating the keys look very handy, however are
there any tools available for encrypting something using the key file generated by
gendsa ? It looks like there is going to be some effort on my part in parsing the
necessary public/private keys and other parameters from the key file so that I can use
them in calls to DSA_sign() and DSA_verify(). Any advice on shortcuts or existing
functions and or tools to help?
3. Is this a good approach? - or am I re-inventing the wheel?
Any help would be greatly appreciated
Bob.
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Bob Ollila - [EMAIL PROTECTED]
(603)665-8100, (603)665-8103 fax
TerraLink Technologies - http://www.terralinktech.com
1600 Candia Road, Suite 5, Manchester NH 03109
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