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:
“They have thrown away her electric toothbrush, someone else slips
The key into the lock of her safety-deposit box
At the Crocker-Anglo Bank; her seat at the cricket matches
Is warmed by buttocks less delectable than hers.”
—Randall Jarrell (1914–1965)
“The first place he went into was the Royal Exchange .... where men of all ages and all nations were assembled, with no other view than to barter for interest. The countenances of most of the people showed they were filled with anxiety; some indeed appeared pleased, but yet it was with a mixture of fear.... [David] resolved to stay no longer in a place where riches were esteemed goodness, and deceit, low cunning, and giving up all things to the love of gain were thought wisdom.”
—Sarah Fielding (1710–1768)
“Any solution to a problem changes the problem.”
—R.W. (Richard William)