Difference between revisions of "Secret Key Cryptography"
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==Context== | ==Context== | ||
| − | At least since the time of Julius Cesar there have been methods know to hide messages from prying eyes. | + | *At least since the time of Julius Cesar there have been methods know to hide messages from prying eyes. |
| + | *During the age of computer communications, it became possible to have real-time communications that was also: | ||
| + | #Hidden from external eavesdroppers. | ||
| + | #Protected from alternation with digital message authentication. | ||
==Problem== | ==Problem== | ||
Revision as of 07:32, 25 September 2018
Full Title or Meme
In Secret Key Cryptography two parties that wish to communicate have some method for creating pre-shared secrets which can be used to hide subsequent communications from others.
Context
- At least since the time of Julius Cesar there have been methods know to hide messages from prying eyes.
- During the age of computer communications, it became possible to have real-time communications that was also:
- Hidden from external eavesdroppers.
- Protected from alternation with digital message authentication.
Problem
A shared secret is not really a secret any longer as either side gets to decide when to release the key and expose the communications, or allow fraudulent messages to be created, even long in the past.
