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Suppose I want to post a message to a bulletin board
It's not a secret message
But I want the readers to know it really came from me
One technique: encrypt it with my GPG secret key
Only I can do this
Readers can download my public key, decrypt the post, and read it
Impostors cannot post messages that can be decrypted with my public key
Drawback: that's a nuisance for readers
What if they just want to read the message without checking if it's from me?
Also, public key encryption and decryption is computationally expensive
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Copyright © 2005 M. J. Dominus |