All Optical Holographic Encryption in Reduced Graphene Oxide Based on Laser Direct Writing

The development of communication technology is an important milestone in modern society. The safe transmission of information is particularly important in communication. Encryption technology has important uses in both military and commercial fields. Optical information encryption and decryption has the advantages of high speed, high efficiency and high security. Among them, digital holography technology can be regarded as an effective encryption method because it introduces Fourier transform in the calculation. At present, digital holography encryption has developed a variety of new methods such as OAM holography and meta-surface holography [1] , [2] . In daily life, decryption through a string of passwords is the most common used method. However, the security of this method is low. Take a string of 6-digit digital password as an example, the number of each digit can be selected is 0~9, so there are only about 10 6 kinds of passwords. It's easy for a computer to try all these numbers.