Visual password and double random phase encryption and decryption method and system

A double random phase, visual cryptography technology, applied in transmission systems, digital transmission systems, and key distribution, can solve problems such as security loopholes in DRPE systems, and achieve the effect of improving security, concealment, and high security

Active Publication Date: 2021-08-13
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these attack methods, the ciphertext-only attack COA is the most deadly cracking method for the DRPE system, because the ciphertext-only attack COA can illegally recover the plaintext from the ciphertext information alone, so the DRPE system has serious security vulnerabilities.

Method used

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  • Visual password and double random phase encryption and decryption method and system
  • Visual password and double random phase encryption and decryption method and system
  • Visual password and double random phase encryption and decryption method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Such as figure 1 As shown, the present embodiment provides a visual cryptography and double random phase encryption method, the method comprising:

[0061] S1. Obtain visual encryption information by using visual coding encryption information; the visual encryption information includes: a first visual key and a second visual key;

[0062] The information to be hidden is encoded into two visual keys (Visual Key) VK1 and VK2 with visual cryptography (Visual Cryptography) 2*2 encoding scheme. For the convenience of expression, VK1 is recorded as the first visual key. key, record VK2 as the second visual key. Visual cryptography is an information technology that uses human vision to decrypt. Multiple visual keys are generated through pixel expansion, and the information can be decrypted by directly superimposing the ciphertext image. The visual key generated by visual cryptography does not carry the original information, and the decryption does not require cryptography k...

Embodiment 2

[0087] Such as image 3 As shown, the present embodiment provides a visual cryptography and double random phase decryption method, the method comprising:

[0088] A1. Perform fingerprint online authentication and get the online authentication result;

[0089] Before online fingerprint authentication, it is necessary to extract secret information from the received host image H with hidden information:

[0090] Use the secret extraction formula to extract the secret information from the received host to obtain the extracted information; the secret extraction formula is: T=(H-I) α -1 , where T is the extracted information, H is the host carrying the ciphertext, I is the host, and α is the attenuation factor.

[0091] A2. When the result of online authentication is that the fingerprint is exactly the same as the fingerprint information entered during encryption, use the double random phase system and the visual decoding method to decrypt the ciphertext.

[0092] The user conduc...

Embodiment 3

[0102] Such as Figure 5 As shown, the present embodiment provides a visual cryptography and double random phase encryption and decryption method, the method comprising:

[0103] B1. The encrypting party uses visual coding to encrypt information to obtain visually encrypted information;

[0104] First, the secret information is divided into two independent visual keys VK1 and VK2 through the visual cryptography scheme.

[0105] B2. Obtain fingerprint information; use the fingerprint collector to input fingerprint information.

[0106] B3. Using a double random phase system in combination with the fingerprint information to encrypt the visual encryption information to obtain ciphertext;

[0107] Consider VK1 as the amplitude and VK2 as the phase. After modulation, VK3 is obtained as the complex amplitude input; then the coherent light emitted by the laser passes through VK3 and the first random phase plate (Phase mask1) of the system, and then passes through the double random p...

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Abstract

The invention relates to a visual password and double random phase encryption and decryption method and system. Fingerprints are adopted as secret keys, online authentication and decryption of the system fingerprints are achieved, visual cryptography and a 4f system are combined, advantage complementation is achieved through technology combination, and safety and concealment are greatly improved. In a secret information extraction process, firstly, fingerprint authentication needs to be carried out, secret information can be completely and correctly extracted only by knowing secret keys such as a scrambling method and an attenuation factor at the same time, and extremely high safety is achieved.

Description

technical field [0001] The invention relates to the technical field of information encryption, in particular to a visual cipher and double random phase encryption and decryption method and system. Background technique [0002] With the rapid development of the Internet, information security has become an increasingly important issue, and people's demand for information security transmission is increasing. The research on optical information security has been paid more and more attention in the past ten years. Optical encryption systems are widely used in information encryption, information authentication and information hiding and other fields. In optical security encryption, information is processed optically rather than digitally, so it has the advantages of multi-dimensionality, high parallelism and fast processing speed. [0003] The Double Random Phase Encoding (Double Random Phase Encoding, DRPE) system was proposed in 1995 as the first attempt to encrypt information ...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L9/32
CPCH04L9/0866H04L9/3231
Inventor史祎诗周新隆祝玉鹏杨栋宇
OwnerUNIVERSITY OF CHINESE ACADEMY OF SCIENCES