The Key Exchange Problem
The key exchange problem is how to exchange whatever keys or other information are needed so that no one else can obtain a copy. Traditionally, this required trusted couriers, diplomatic bags, or some other secure channel. With the advent of public key / private key cipher algorithms, the encrypting key (aka public key) could be made public, since (at least for high quality algorithms) no one without the decrypting key (aka, the private key) could decrypt the message.
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Famous quotes containing the words key, exchange and/or problem:
“At the last, tenderly,
From the walls of the powerful fortress’d house,
From the clasp of the knitted locks, from the keep of the well-closed doors,
Let me be wafted.
Let me glide noiselessly forth;
With the key of softness unlock the locks—with a whisper,
Set ope the doors O soul.”
—Walt Whitman (1819–1892)
“I cannot say what poetry is; I know that our sufferings and our concentrated joy, our states of plunging far and dark and turning to come back to the world—so that the moment of intense turning seems still and universal—all are here, in a music like the music of our time, like the hero and like the anonymous forgotten; and there is an exchange here in which our lives are met, and created.”
—Muriel Rukeyser (1913–1980)
“... your problem is your role models were models.”
—Jane Wagner (b. 1935)