Research Of Secure Communication And Image Encryption Based On Optical Chaos

With the expeditious development and popularization of contemporary network tech-nology,the interflow of information data becomes more intensive and frequent,and the dissemination of information data becomes more rapid and convenient.People have en-tered the era of“Data for all”,where personal privacy information is the basis of big data operation.The more comprehensive personal privacy information enterprises grasp,the more advantageous can be assisted by enterprises to locate users more accurately,thus providing better services.While big data fetch convenience to people's life and produc-tion,our personal information inevitably leak out in the current network circumstance,which bring troubles to our lives,and even seriously endanger our personal interests,es-pecially in some fields and industries that are extremely sensitive to information and data,causing huge losses.Therefore,how to ensure the security of information is a realistic problem that needs to be solved urgently,particularly when it comes to image information that can vividly display the content of information.The research on image security that many experts focused on has become a hot area.At present,the most ordinary and effective way to ensure image information security is to encrypt the original image information with image encryption algorithm,making it blurred and unrecognizable.Afterwards,the encrypted information can be guaranteed in the transmission by utilizing secure communication technology,or it can be insured in the cloud transmission by using secure cloud sharing technology.Nowadays,the image encryption algorithm and secure communication technology that people mainly studied and used are all based on the traditional chaotic mapping system,which is easy to im-plement in the actual circuit,but it is also restricted to the electronic bottleneck of the electronic circuit system.With the in-depth study of the nonlinear dynamics of semicon-ductor lasers,it has been found that optical chaos generated by semiconductor lasers can break through the electronic bottleneck of traditional chaos,and has abundant advantages,such as high bandwidth,complexity and propagation speed.Therefore,the optical chaos has great research and application prospects in the field of image encryption and secure communication.The main contents of this thesis are as follows:?1?A new double masking?DM?scheme for strengthening safety of optical chaotic communication is presented on account of two groups of mutually asynchronous vertical-cavity surface-emitting lasers?VCSELs?.We numerically dissect the synchronization idiosyncracy of the lasers and the suppression of the time-delay signature?TDS?.The self-correlation function?SF?and permutation entropy?PE?are utilized to distill the TDS.Simultaneously,on the basis of the high character synchronization,we also study the com-munication capabilities of DM scheme on a long haul.Extraordinarily,the impact of the time delay due to delay fiber?DF?on the communication character in diverse cases is studied.The outcomes reveal that the TDS can be suppressed by the DM system to a certain extent.Four messages of 10 Gbit/s can be disseminated in 138 km single mode fiber?SMF?after incoming the dispersion compensating fiber?DCF?,bidirectionally and simultaneously.At that time the BER?10^-9and Q factor?6,the DM scheme exists smaller critical value of the time shift??t?than the single masking?SM?system,this verifies the effectiveness of the DM system in strengthening the safety of optical commu-nication.?2?A novel color image encryption and cloud sharing system is experimentally ac-tualized and assessed,which coalesces the preponderances of optical chaos and hardware implementation in image encryption and security sharing,availing ARM-embedded plat-form Exynos4412 model,in company with VCSEL subject to POEF.We explore the dy-namic deeds of the VCSEL and gain the chaotic output.An analog to digital conversion?ADC?module is availed for optical chaos data collection.The modified gravity model and the double sine map are availed to encode the image,and the encoded image is se-curely shared through cloud services.The subscriber can download the encrypted image and decipher it by the hardware with a good potency.The experiment results exhibit that the system possesses a palmary resistance to ordinary attacks.Compared with the numer-ical emulation,our hardware implementation for such a color image encryption and cloud sharing system is extremely formidable to actualize,but we successfully implemented and tested in a real-world environment.By comparing experimental and simulation results,the consistent results are found.Therefore,in the case of similar encryption effect,the user's privacy protection can be securely guaranteed on our hardware platform.