Title :
Classical optical cryptography
Author :
Chan, Vincent W. S.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci, Massachusetts Inst. of Technol., Cambridge, MA, USA
Abstract :
This paper describes a cryptographic technique based on coherent optical communication for fiber or free space networks. A pseudo-random cipher-stream is used to band-spread an optical carrier with coded data. The legitimate receiver uses the agreed upon key to modulate its local oscillator and the resulting beat signal will uncover the band-spread signal. An eavesdropper who does not have the key will find the spread signal with too low signal-to-noise ratio to perform any useful determination of the message sequence. Theoretical bounds based on Shannon´s Theory of Secrecy is used to show the strength of the encoding scheme which is expected to be superior.
Keywords :
cryptography; information theory; optical fibre networks; telecommunication security; Shannon theory; band spread signal; classical optical cryptography; coherent optical communication; cryptographic technique; fiber space networks; free space networks; message sequence; optical carrier; signal-to-noise ratio; spread signal; Cryptography; Noise; Optical amplifiers; Optical mixing; Optical receivers; Optical transmitters; optical network security;
Conference_Titel :
Transparent Optical Networks (ICTON), 2015 17th International Conference on
Conference_Location :
Budapest
DOI :
10.1109/ICTON.2015.7193389
