6 results about "Brute force" patented technology

This technology is applied in the field of network security. This invention provides a method and apparatus for defending against SSH brute-force attacks through log analysis. The purpose of this invention is to solve the problem of inefficiency in existing security defense measures when they cannot cope with brute-force attacks. The main solution includes: acquiring security logs and system logs from monitoring devices and providing them to the perception module; acquiring the attacker's source IP address, username, and time; the perception module recording the attack source IP address, username, and time information in memory and performing statistics within a set time period; querying third-party professional threat intelligence to return the attack source IP address attribution information and threat score; the log threat analysis module defining the danger level of the brute-force threat based on the attack source IP address and threat score; and implementing different corresponding response measures based on the risk identification results of the threat analysis module.

The present application relates to a kind of image encryption and decryption methods based on heterojunction memristor PUF, belong to hardware security technical field, the method includes first entropy source extraction: extracting the high resistance state current of each unit in heterojunction memristor, second entropy source extraction: the same heterojunction memristor device is operated multiple times, reads its low resistance state current value and calculates its coefficient of variation, encryption structure dynamic binding: using average value and setting function dynamically determines global structure parameter in encryption algorithm, double binding encryption and decryption process: when encryption, with binary initial key as input, and according to global and local structure parameter, encryption operation is carried out, while recording the topological evolution index in encryption process;When decryption, the global and local topology is reconstructed by topological evolution index reverse, and decryption is completed after matching and obtaining binary initial key;It improves the ability of anti-brute force cracking, while guaranteeing the reversibility and reliability of encryption and decryption, with good scalability and application prospect.

The present application is directed to the problem that static DNA encoding and calculation rules are single, encryption process is separated from plaintext, and plaintext is vulnerable to attack, and proposes a color image encryption method based on new 4-dimensional hyperchaos and DNA random encoding calculation. The method first designs a new 4-dimensional hyperchaotic system, iterates the system to generate multiple pseudo-random sequences, generates new pseudo-random sequences and matrices by calculation and modification, decomposes the color image into R, G and B channel components, and then fuses them into a matrix, then encodes and calculates the image and the pseudo-random matrix according to the newly generated pseudo-random sequence, and then performs DNA random decoding, decomposes the matrix into channel components, and fuses to generate the final ciphertext image, wherein the initial value of the chaotic system is calculated by the SHA-512 algorithm. The encryption method proposed by the present application not only has large key space and strong sensitivity to plaintext, but also can effectively resist statistical, brute force and differential attacks.

The application provides a visual semantic-oriented video privacy protection method and system, the method comprising: generating a 256-bit derived key through AES-CBC and SHA-256 algorithms; splitting a target video into a cover frame and main content; rearranging and encrypting each element in the image block after substitution encryption based on a serial number matrix; integrating the encrypted video main body and the video cover encryption image; sequentially executing residual coefficient and intra prediction mode decryption, inverse rearrangement decryption opposite to the rearrangement operation in the encryption stage, substitution inverse decryption and block recombination on the final encrypted video, and then combining the video content to obtain the recovered decrypted video. The application can effectively resist various attacks such as brute force cracking, data loss, Gaussian noise and re-encoding, and still maintains stable privacy protection capability in a complex transmission and storage environment.