Tuesday, June 5, 2007

3 steps to understand "signing a msg" with a private key

1) understand basic meanings of your private key ^ your pub key.

If you can't remember anything, remember to keep your private key very
very private, and publish your pub key to friends.

If you can remember one more thing, then remember

"sign with private key; verify with public key".


2) understand "digsig" -- an encryption of a msg, encrypted with your
private key

You often send the digsig to your receipients to certify something.
Receipients can verify your digsig using your pub key

3) understand what it means to "sign a msg".

In the simplest case, it means "produce a digsig, and send the (cleartext) msg + the digsig"

Q: This process offers CIAn?
A: IAn but not Confidentiality since you actually send a cleartext msg

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