65 results about "DNA Computations" patented technology

The invention discloses a multi-channel color image chaotic encryption method based on DNA coding, relates to the field of digital image encryption, and aims to solve the problems that an existing image chaotic encryption scheme is insufficient, and a high-dimensional continuous time chaotic system is complex in discrete process algorithm, so that the safety of an encrypted image is low, and the acquisition of a discrete chaotic sequence is time-consuming. A six-dimensional discrete hyper-chaotic system is used for generating six groups of chaotic sequences, and a Hash function SHA-256 is usedfor generating a system iteration initial value; RGB (red, green and blue) components of the color image are extracted, DNA (deoxyribonucleic acid) coding is performed on each component to obtain a DNA matrix, the DNA matrixes is merged, a recombinant DNA matrix is constructed, and row and column scrambling operation is executed; Then, the scrambled DNA matrix is splitted into three matrixes withthe same size, respectively DNA calculation is carried out on the three matrixes and the three chaotic key matrixes subjected to DNA coding, and DNA decoding operation is carried out on the obtainedmatrixes; diffusion encryption operation is performed on the decoding matrix, wherein the encryption round number is determined by SHA-256. The encryption effect is good and the security is high.

A DNA computer for carrying out computations using DNAs is provided with a dividing part for dividing a problem that is to be solved into a plurality of partial problems, and an operation part for obtaining a DNA sequence corresponding to a solution to the problem, by combining DNA sequences corresponding to solutions of the plurality of partial problems.

A DNA computer for carrying out computations using DNAs is provided with a dividing part for dividing a problem that is to be solved into a plurality of partial problems, and an operation part for obtaining a DNA sequence corresponding to a solution to the problem, by combining DNA sequences corresponding to solutions of the plurality of partial problems.

The invention relates to a method for using DNA induction nanometer particles to form tree wire, wherein said method comprises that: 1, putting solution with nanometer metal particles into deoxyribonucleic acid solution decorated by 5' mercapto to be mixed; 2, adding dimethyl sulfoxide, triethyl ester phosphate, or tripropoxy silicane, etc, adding buffer solution, adding Na+ and Mg2+, or adding K+ and Mg2+; 3, laying to form the tree wire. The invention uses the DNA recognize function, to induce the nanometer particles to form the nanometer tree wire, via the DNA sequence and self-installment condition to adjust the angles of branch and main tree of nanometer tree, and the distance between branch distance. The invention can be used in DNA molecule device, etc.

The invention discloses a novel digital image encryption method belonging to the field of DNA calculation and image encryption, and provides a digital image encryption method based on a DNA sequence and multi-chaotic mapping. The traditional encryption algorithm based on chaos has the defects that a key space is small, a chaos system is easy to analyze and forecast, and the like; and almost of the current encryption systems based on DNA need complex biological operation and are hard to realize. In order to overcome the defects, the invention provides the digital image encryption method based on a DNA sequence and multi-chaotic mapping, comprising the following steps of: firstly, scrambling the positions of pixels of images by utilizing a two-dimension chaotic sequence generated by Cubic mapping and Haar wavelet functions, and then disrobing the pixel values of the images under the action of a chaotic sequence generated by the DNA sequence and the Logistic mapping. The experimental result shows that the algorithm is easy to realize, has better encryption effect on images, large key space and high sensitivity to keys and can effectively resist exhaustive attack and statistical attack.

A method and associated systems for using machine-learning methods to perform linear regression on a DNA-computing platform. One or more processors generate and initialize beta coefficients of a system of linear equations. These initial values are encoded into nucleobase chains that are then padded to a standard length. The chains are allowed to bind with complementary template chains in a DNA-computing reaction, and the resulting DNA molecules are decoded to reveal the relative the relative likelihood of each chain to bind. The initial values of the beta coefficients are weighted proportionally to these likelihoods, and the process is repeated iteratively until the beta coefficients converge to optimal values.