Scientists have demonstrated how encrypted messages may be sent in the future.
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Quantum key encryption is one promising method of securing communication, especially if it can be transmitted by satellites. Scientists at an Italian observatory this year succeeded in firing lasers at the mirror-covered Ajisai Japanese satellite, proving that a sequence of photons can travel great distances through space. The laser pulsed photons at the satellite at 17,000 times per second; a fraction bounced back to a telescope at the observatory. On Earth, the longest successful quantum encryption link has been just under 100 miles because the photons scatter as they travel through the air. To reach the satellite, the photons only had to travel through 5 miles of atmosphere during their 1000-mile journey, allowing the sequence to arrive in order.
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