  Encryptions Future: Quantum Cryptography  Ever since writing
has existed, people have wanted to send secret messages to one
another--and others have wanted to intercept and read them. This
is the fourth installment of a blog series taking you through
the history of cryptography, its present, and future
possibilities of unbreakable codes. Follow the links to read the
first, second, and third parts of the series.  In the last post
I talked about Public Key Cryptography, a system that derives
its security from "hard" math problems like finding the factors
of large numbers. But increases in computing power have made
once-impenetrable codes solvable in just a few months. Keeping
ahead of technological development by increasing the length of
the secret number used to encode information--the key--is always
an option, but there is still a chance that someone will find a
tricky way to calculate your private key, letting them read all
your messages.  One of those tricks could be quantum computing.
Scientists have sho