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public_key_cryptography_and_pgpGur Gryrtencu: Are you the sort of person who gets impatient when your PGP-encrypted e-mail takes more than 4 nanoseconds to cross the Atlantic?

Be glad you weren’t born in ancient Greece.

“The Greeks would shave a messenger’s head, write a secret message on his scalp, and let the hair grow back before sending him,” said Bryan Higgs, whose fascination with codes and history led him to this unusual tidbit. “It makes you think: ‘OK, time wasn’t quite as critical for them.’” [Source]
robomarine meinte am 25. Apr, 05:52:
Fbyhgvba
Technological Progress: Cryptography

The Telegraph:...

It's a slow Sunday night for me! 
Mahalanobis antwortete am 25. Apr, 09:57:
Wikipedia
has a nice article on ROT13.

Highly recommended: http://www.rot13.com/ ;-D 
robomarine meinte am 26. Apr, 02:19:
I have always know this as Caesar Shift. Its use is documented in Julius Caesar's: 'The Conquest of Gaul.'

If anybody is interested in a great introduction to cryptography, I highly recommend Simon Singh's: "The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography."