Re: Is it possible to encrypt a 10 character string to a 20 character string using Public key cypt

xcong2000@xxxxxxxxx wrote:
Kristian, you are right, what we need is a digital signature. after
reading your response, I googled for "bilinear pairing", which gave me
the article "Signature-Masked Authentication Using the Bilinear
Pairings"
(http://caislab.icu.ac.kr/Achievement/technical%20report/data/author-pairing.pdf),
which pointed me to article "Short signatures from the Weil pairing" at
http://crypto.stanford.edu/~dabo/abstracts/weilsigs.html. I believe the
latter article essentially presented the idea in your message. Now I
will still struggle to implement it or find a open source impl for it,
but I feel I'm now on the right tract. Thank you very much for your
kind responses.

LTP, thank you for your responses. I realy can't reveal much about the
software I'm working on. It's not a schema to protect the software
though. We don't care if the user hacks the software to get around
this. All we care is that the input data can't be easily generated. I
know this doesn't make sense. But that's all I can say.

If you were worried about a user finding a symmetric decryption key in the code, then I suppose you'll also be worried about a user altering the 'public' verification key, or bypassing verification completely.
You will also want to decide whether you care if the user 'replays' signed data later at a time of her own choosing.
And whether you care if data valid for one user is also valid for another user.

--Mike Amling
.

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