123results about How to "Increase the difficulty of deciphering" patented technology

The invention relates to a path password input method based on touch spots, which is as follows: an input device displays a password input matrix on the display screen of the input device; users lay off a path from the password input matrix as a password through a mouse or a touch screen and other input devices, the password input information is transferred to a processor in the input device; the processor of the input device transforms the path password information into letters or figures, then compares the letters or the figures with the pre-stored password in the processor, if matching, the password validation is passed, and if not, the users need to return to re-input the password. The path password input method based on touch spots has the advantages that: the users orderly pass each spot of the password input matrix to form the path as the password, which ensures the password input becomes easy and rapid, improves the memorability of the password and high intensity of the setting,; and the path password does not have any relations with the personal profile, which is not easy to form the password dictionary. The path password input method based on touch spots not only can be used for password input, but also can be used as a short cut for starting a certain program or can be used as a shortcut key of a certain function of the program.

The invention relates to the secret communication field of mobile communication technologies, and discloses a user identity protection method based on a public-key mechanism. The method comprises the following steps: an HSS (hierarchical service system) produces a pair of keys, namely, a public key PK and a secret key SK, then the public key PK is preset to a USIM (universal subscriber identity module) card of UE (user equipment) belonging to the public key PK in the form of a public key file PKF, and the secret key SK is stored in the HSS; a mobile phone sends the following information to anMME (mobility management entity), including HSS identification: HSS_ID, public-key PK version number: VER_PK; and data (IMSI || R|| VER_PK) encrypted by using an asymmetric encryption algorithm; after receiving the information, the MME sends the VER_PK and the (IMSI || R|| VER_PK) to the HSS according to the HSS_ID; and the HSS decrypts the VER_PK and the (IMSI || R|| VER_PK) by using the secret key SK. Because attackers do not know the secret key SK of the HSS, the attackers can not decrypt the (IMSI || R|| VER_PK).

The invention discloses an ELF file protection method and system based on ARM instruction virtualization. The method includes the steps that an original function instruction is converted into bytecodes; a register and stack information of an original function are stored, a jump instruction is added, and other instructions are deleted; the jump instruction is executed, and the bytecodes are interpreted by jumping to an interpreting engine. In this way, the original function instruction is converted into the bytecodes in a virtualization mode, the difficulty of a cracker is increased, and the file protection strength is improved.

The invention belongs to the technical field of information security in communication transmission, and particularly relates to a DNA encryption system and an encryption method. The system comprises an encryption key, an information conversion portion, an information encryption portion, an information transmission portion, a decryption key and an information decryption portion, wherein the encryption key and the decryption key are primer sequences; and information encryption refers to that information is converted and coded and then corresponds to A, T, C, G bases in DNA in a one-to-one mode according to a predetermined rule. The encryption system and the encryption method provided by the invention can realize automatic operation of corresponding code conversion, encryption and decryption by depending on biological problem setting and biological technology development and by being matched with development of corresponding computer information technologies at the same time, have the characteristics of good compatibility with other encryption methods, high automation degree, simple key, high password cracking difficulty, safer information transmission and the like, has good application values, and can provide better reference for other new encryption systems at the same time.

The invention provides an image encryption method based on Duffing mapping and genetic operation. The hash value of a plaintext image is calculated by using a Keccak algorithm as an initial value input key of a chaotic system; the sensitivity and pseudo-randomness of the chaotic map to the initial conditions are used, the pseudo-random sequence is obtained by iterating the Logistic map and the Hill encryption matrix is generated to scramble and replace the image matrix. Combined with Duffing map and DNA coding technology, pixel selection, crossover and mutation are realized by genetic operation to achieve pixel diffusion and scrambling, and bidirectional exclusive OR operation with chaotic sequence to enhance its confusion and diffusion characteristics. The invention utilizes the pseudo-randomness of Duffing mapping and Logistic mapping, ergodicity and the crossover mutation operation of genetic algorithm, has strong sensitivity to key, can effectively resist statistical attack and differential attack, etc., has good security and application potential, and the image encryption effect and performance are remarkably improved.

The invention belongs to the technical field of communication security, and particularly relates to an OFDM communication signal physical layer encryption method and device, and the method comprises the steps: carrying out the symbol-by-symbol switching of a chaotic phase sequence initial value through a communication signal transmitting end secret key generation module; generating a dynamic composite chaotic sequence by combining the improved Logistic chaotic mapping and the Chebyshev chaotic mapping, and performing nonlinear disturbance on the composite chaotic sequence to obtain a chaotic sequence for encryption; and mapping the chaotic sequence to an OFDM rotation phase vector to complete physical layer encryption. According to the invention, symbol-by-symbol switching of chaotic sequence initial values is carried out; then, generating a composite chaotic sequence by combining the improved Logistic chaotic mapping and the Chebyshev chaotic mapping; the sequence randomness is improved through nonlinear disturbance, the initial value sensitivity of chaotic mapping is fully utilized, the decoding difficulty is further increased, compared with a traditional chaotic phase encryptionscheme, the operand is greatly reduced, the communication safety performance is greatly enhanced while the encryption chaotic performance is improved, and good application value is achieved.

The invention provides an e-mail encryption method, a first client and a blockchain system. The method comprises the following steps: acquiring an e-mail to-be-transmitted; under the condition that afirst client establishes a communication connection with a first blockchain node, obtaining a key corresponding to the current transmission of the first client; encrypting the e-mail according to thesecret key to obtain an encrypted e-mail and an e-mail certificate; uploading the mail voucher to the first blockchain node so that the first blockchain node broadcasts the mail voucher to a second blockchain node and provides the mail voucher to a second client; and sending the encrypted email to the second client so that the second client decrypts the encrypted email through the email certificate to obtain the e-mail. On the basis of an original mail transmission path, only the mail certificate is transmitted through the blockchain, the property that the blockchain is suitable for small-volume data transmission is met, and the reconstruction, operation and maintenance cost of a mail system is reduced while mail encryption is achieved.

The invention provides an anti-peeping display system based on rotary polaroids, relates to the technical field of liquid crystal display, and aims at solving the problems that in the anti-peeping display technology, the existing anti-peeping display technology is poor in anti-peeping performance and safety, large in technological difficulty and high in production cost. The system comprises the first polaroid, a first motor, a liquid crystal module, a first control module and polaroid glasses. The liquid crystal module comprises a TFT array plate, a liquid crystal box and a color filtering plate. A signal sending device is included in the first control module. The polaroid glasses comprise the second polaroid, the third polaroid, a first transmission rod, a second transmission rod, a second motor, a second control module and a polaroid manual adjusting knob. A signal receiving device is included in the second control module. The decoding difficulty of display content for a peeper is increased through the changes of the rotating speeds of the polaroids.

An encryption and decryption method based on zipper type dynamic hashes and NLFSRs comprises the following steps that a nonlinear feedback function and a bit transformation Boolean function are used for preprocessing a seed secret key to form a secret key stream sequence; changing the bit value of the plaintext sequence according to the bit transformation Boolean function based on the key stream sequence to form a pseudo plaintext sequence; dividing the pseudo-plaintext sequence into a plurality of paths of pseudo-plaintext subsequences according to the key stream sequence; and calculating a dynamic hash address corresponding to the binary bit of each pseudo plaintext sequence according to a hash mapping rule depending on the key stream sequence, and mapping the pseudo plaintext subsequence hashes which are divided into multiple paths into a ciphertext space to form the ciphertext stream sequence. The method has the beneficial effects that the key stream generator not only uses a nonlinear feedback shift register, but also introduces a bit transformation Boolean function, so that the key stream with longer period and better randomness is obtained; and through a plaintext bit transformation rule and a zipper type dynamic hash mapping rule, the decoding difficulty of the ciphertext stream sequence is improved.

The invention provides an identity verifying method, device and system, which are applied to the Internet field. The method includes the following steps: receiving multiple sub-images that are sent from a server and serve as CAPTCHAs (Completely Automated Public Turing Test to Tell Computers and Humans Apart), the multiple sub-images obtained through cutting of an original image; conducting disorder displaying of the multiple sub-images and simultaneously displaying a splice frame for holding splice images, so that a user splices the multiple sub-images together to form a spliced image in the splice frame; splicing the multiple sub-images together in the splice frame according to operations acting on a display interface; and if detecting that the size of the current spliced image in the splice frame reaches preset dimensions, sending the current spliced image in the splice frame to the server so that the server verifies the spliced image. According to the scheme, the sub-images obtained from cutting of the entire original image are sent to the user to be spliced together. The whole verifying process is easy for the user who is a human, but decoding is more difficult for a machine.

The invention provides a color image chaotic encryption method and belongs to the technical field of encryption. The method is realized through the following steps: optimizing a Lorenz chaotic sequence; generating three scrambling matrixes by utilizing the optimized chaotic sequences x', y' and z', and carrying out scrambling on three components of an RGB color image; carrying out block encryption; outputting a scrambled color image, and synthesizing the scrambled three-primary-color images to obtain an encrypted image; and decrypting the image. The algorithm carries out scrambling on three primary color components of the color image through Px, Py and Pz in a spatial domain range, thereby enhancing strength of algorithm diffusion, and further increasing decoding difficulty; the three primary color components are scrambled respectively, so that the encrypted image is allowed to have color change in the visual sense, and the image is more difficult to read; meanwhile, scrambling degreeof the adopted algorithm is similar to the scrambling degree of magic square transformation, so that the method has good scrambling performance; and the method has higher anti-attack ability.

The invention belongs to the field of channel coding and encryption and particularly relates to coding and encryption integrated design based on a LDPC. For the defect that an M symmetric cryptosystemis high in key cost and has security vulnerabilities, the invention provides a safe and reliable transmission method based on the LDPC. According to the method, an encryption error correction matrixis generated under the control of a big random number seed N, the same permutation matrix and check matrix which are generated by two parties synchronously based on linear congruence according to thesame seed are received, and each time when communication is carried out, encryption coding matrixes are changed synchronously, so one-time pad is realized, the key cost is reduced, and moreover the safety of a system can be ensured.

The invention discloses a distribution automation information encryption method based on quantum reinforcement, and the method comprises the steps: presetting a key pool A in a master station and all terminals, independently setting a key pool B in the master station, pre-storing a key in the key pool A, pre-storing or storing a newly added key in the key pool B, and storing the newly added key in the key pool B, wherein the keys are quantum keys converted after quantum random numbers are generated by a quantum random number generator; distributing key packets: the terminals communicate with the master station, the terminals and the master station jointly select a key a from the key pool A, the master station extracts part of keys from the key pool B to form a key packet, and the key packet is encrypted by using the key a and sent to all the terminals; the terminal decrypting the received key packet by using the key a, extracting the key in the key packet for performing secondary encryption and decryption on the state grid encrypted message, and marking the key in the key packet after being used; and after all the keys of the key packet in the terminal are marked, a key a being selected from the key pool A again, and key packet distribution being performed again.

The invention relates to an image encryption method, and particularly relates to a chaotic image encryption method based on area-preserving Baker mapping. The method has a simple process, the space-time complexity can be enhanced, the computer precision restriction problem can be solved, and the encryption algorithm complexity can be increased. Meanwhile, as the chaotic system of the invention adopts a quantum chaotic system which is more complex that a common chaotic system, in the quantum chaotic system, the addition of disturbing momentum enables the chaotic system to be better in aperiodicity and stronger in sequence randomness, and problems of a fixed point and a stable window existing in the common chaotic system can be improved and solved.

The invention discloses a trusted data transmission method for multiple unmanned platforms, and belongs to the technical field of data transmission. The method comprises the steps of self-adaptive encoding based on the bit error rate, hierarchical encryption of data, self-adaptive adjustment of key parameters, generation of a data packet, generation of check bits, periodic statistics of the bit error rate, acquisition of key information, decryption of the data and the like. Compared with a traditional unmanned platform data transmission method, the method has the advantages that the safety performance of unmanned platform data transmission can be remarkably improved, the adaptability to a complex electromagnetic environment is higher, and the method has great theoretical research value andengineering practice significance.