Applications of single-qubit rotations in quantum public-key cryptography

We discuss cryptographic applications of single-qubit rotations from the perspective of trapdoor one-way functions and public-key encryption. In particular, we present an asymmetric cryptosystem whose security relies on fundamental principles of quantum physics. A quantum public key is used for the encryption of messages while decryption is possible by means of a classical private key only. The trapdoor one-way function underlying the proposed cryptosystem maps integer numbers to quantum states of a qubit and its inversion can be infeasible by virtue of the Holevo's theorem.Comment: to appear in Phys. Rev.

Method of Asymmetric Optical Encryption of Images Using Spatially Incoherent Illumination

The method of asymmetric encryption of images based on the double optical encryption with spatially incoherent illumination is presented. Numerical simulations of the presented method in various modifications are carried out and their efficiency is estimated. The modification providing the best balance between maintaining the advantages peculiar to the optical encryption and quality of the decoded images is chosen. In this case the value of the normalized standard deviation (NSTD) of the decoded image from original one for asymmetric encryption differs no more than by 8% from NSTD of standard optical encryption with spatially incoherent illumination

A New Image Encryption Algorithm Based Slicing and Displacement Followed By Symmetric and Asymmetric Cryptography Technique

This paper titled “A New Algorithm for Image Encryption Based on Slicing, Displacement Followed by Symmetric Encryption” is proposed for image encryption by studding the principle of the image encryption algorithm. In this, a new hybrid image encryption algorithm is proposed by analyzing the principle of the encryption algorithm based on the combination of symmetric and asymmetric encryption. The experimental results based on combination of symmetric and asymmetric encryption will approve the effectiveness of the proposed concept, and the combination of symmetric and asymmetric encryption will show large variation in key space and provide high-level security. Proposed algorithm will support to integrity, authorization, accuracy of images which is transmitting in public network. As we know that, an image-based data requires more effort during encryption and decryption. This research introduces a block-based algorithm which is the combination of “Slicing and Displacement of RGB value of a Pixel” and “Block Cipher” base image encryption algorithm. The original image was divided into four equal parts, where each part of image will rearranged into displacement of RGB value of a pixel and then resultant image will divided into pixel blocks. Read binary value of pixel blocks. This binary value will be process by encryption process through binary value of selected key. Now finally encrypted image will be produced. This process will repeat on each parts of image. After that each part will be combining and produce final cipher image. Encryption key will also encrypted by asymmetric key concept so key exchanging problem will not occur in this system. The Proposed Architecture for encryption and decryption of an image using suitable user-defined key is developed. The cipher image generated by this method can be very in size as the original image due to image scaling to make 128 bits block at a time and is suitable for practical use in the secure transmission of confidential information over the Internet. DOI: 10.17762/ijritcc2321-8169.15053

Review on DNA Cryptography

Cryptography is the science that secures data and communication over the network by applying mathematics and logic to design strong encryption methods. In the modern era of e-business and e-commerce the protection of confidentiality, integrity and availability (CIA triad) of stored information as well as of transmitted data is very crucial. DNA molecules, having the capacity to store, process and transmit information, inspires the idea of DNA cryptography. This combination of the chemical characteristics of biological DNA sequences and classical cryptography ensures the non-vulnerable transmission of data. In this paper we have reviewed the present state of art of DNA cryptography.Comment: 31 pages, 12 figures, 6 table

Roadmap on optical security

Postprint (author's final draft