Quantom image detection in visual cryptographic

ABSTARCT :

Cryptography is the essential subject for network information security to protect important data. Although following the symmetric cryptosystem for which the participations in the communication keep exactly the same keys, the special for the encryption and decryption algorithms proposed in this paper lays in the operational objectives, the quantum image. Firstly, extracts the properties of gray-scale and position from the quantum gray-scale image which the storage expression of image in quantum states is achieved. Along with the geometric transformations in classical images, this article realizes the quantum image geometric transforms by means of designing quantum circuits. Eventually, through a combination of the proposals in previous, the encryption and decryption algorithms on quantum gray-scale images is finally accomplished, which could ensure the confidentiality and security of the information in delivery. The algorithms belong to the application of quantum image geometric transformations, for further, the new explorations for quantum image cryptography researches.

EXISTING SYSTEM :

? Learning from the quantum computation, to demonstrate the existence and the implementation we should transform to the proposed expression from the prepared initial quantum state through kinds of quantum gates. ? Therefore, more and more comprehensive disciplines combined with quantum information appeared in which the quantum image processing included. ? In signal processing, researches more focused on image enhancement, segmentation, restoration and reconstruction. ? While another division paid much attention to image storing in quantum state as well as the transforms and the using of quantum logic gates.

DISADVANTAGE :

? The proposal solved the problems of the key distribution of the symmetric cryptosystem and the high costs of its management and improved the security of information conveying. ? However, with the rapid development of calculation and the emergence of various advanced algorithms, including the classical and the quantum counterpart, the security of the symmetric and the public key cryptosystem has to be faced with the sever challenges. ? The factorization of large numbers algorithm which has formed a great threat to the public key cryptosystem that based on the problems of large number decomposition and discrete logarithm solution over finite fields.

PROPOSED SYSTEM :

• In addition, the proposed algorithms could be much more widely practiced. • As the image stored in quantum states, the conveyed image in communication channel is actually the quantum states. Put aside the quantum images, even if simple quantum states could be encrypted and decrypted in algorithms. • This article realized the quantum image encryption and decryption and protected the communication whose original information was ciphered by the proposed quantum gray-scale image expression and the designed quantum image transformations. • The expression puts up a novel method to store gray-scale image in quantum states on the basic of the possessed properties of gray-scale value and position for each pixel.

ADVANTAGE :

? It improves the efficiency of classical cryptography cracking by quantum computer, which seriously threatens the security of classical cryptosystem. ? The destination image processed by addition and subtraction would be uncountable as well as the gray-scale states, as long as the coefficients agree to the normalized condition. ? In signal processing, researches more focused on image enhancement, segmentation, restoration and reconstruction. ? Quantum image translations make full use of tracks in the process which could be easily completed on qubits switch on quantum circuits. ? To keep the basic characteristic of the symmetric cryptosystem that the encryption keys are equal to the decrypted ones.