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:
“Yes, I know.
Death sits with his key in my lock.
Not one day is taken for granted.
Even nursery rhymes have put me in hock.”
—Anne Sexton (1928–1974)
“If mass communications blend together harmoniously, and often unnoticeably, art, politics, religion, and philosophy with commercials, they bring these realms of culture to their common denominator—the commodity form. The music of the soul is also the music of salesmanship. Exchange value, not truth value, counts.”
—Herbert Marcuse (1898–1979)
“War is not a life: it is a situation,
One which may neither be ignored nor accepted,
A problem to be met with ambush and stratagem,
Enveloped or scattered.”
—T.S. (Thomas Stearns)