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:
“The word “forbearance” is the key to a happy home.”
—Chinese proverb.
“We never exchange more than three words with a Friend in our lives on that level to which our thoughts and feelings almost habitually rise.”
—Henry David Thoreau (1817–1862)
“The government is huge, stupid, greedy and makes nosy, officious and dangerous intrusions into the smallest corners of life—this much we can stand. But the real problem is that government is boring. We could cure or mitigate the other ills Washington visits on us if we could only bring ourselves to pay attention to Washington itself. But we cannot.”
—P.J. (Patrick Jake)