40 results about "Collision attack" patented technology

The message authentication code with blind factorization and randomization is a computational method for improving the security of existing Message Authentication Code (MAC) methods through the use of blind integer factorization. Further, blind randomization is used as a countermeasure to minimize collision attacks where different plaintexts produce the same MAC.

The RNS-based cryptographic system and method uses a symmetric residue number system (RNS) for encryption and decryption of messages, i.e., the sender and receiver agree upon a set of relatively prime numbers, referred to as the basis, whose product is an integer, and both the RNS and the integer are kept secret. To break the cipher, an attacker must factor the secret integer, which is unknown to the attacker, given only the upper bound of the unknown integer, a problem referred to as blind factorization of the unknown integer, which is a computationally hard problem. The method may be combined with a discrete logarithm problem, and the ciphertext may be padded with random values to hide the upper bound of the unknown integer. When the ciphertext requires multiple blocks, subsets of the basis and / or the random number padding may be used to prevent collision attacks.

The invention belongs to the field of information security, and discloses a CRT-RSA selected plaintext joint attack method and system. During the attack process, the d p and d q As the attack target, then derive the private key parameters p, q; in the plaintext collision attack process, select multiple sets of plaintext pairs, superimpose them, and do secondary processing on the power consumption difference of the model multiplication as a collision classification set; in the attack process, Combined with the disclosure of the Hamming weight information of the access number power consumption exponent during the CRT-RSA modular exponentiation operation, the modular multiplication power consumption is segmented, and the segmented plaintext collision attack is implemented. The present invention combines the problems of other information leaks (such as access number power consumption exponent Hamming weight information leak) in the CRT-RSA modular exponentiation process, performs modular multiplication power consumption segmentation, and implements segmentation selection plaintext collision attacks, which can avoid partial The collision attack is wrong, thereby improving the attack accuracy, and finally deriving the private key parameters p, q, and recovering the private key d value.

The present invention provides an encryption method and apparatus. The objective of the invention is to solve the problem that an encryption mode in the prior art may reduce the security of stored standard passwords. The method includes the following steps that: a plaintext character string is acquired; the acquired plaintext character string is encrypted through adopting at least two kinds of encryption algorithms, so that at least two corresponding ciphertext character strings can be obtained; characters are intercepted from each kind of obtained ciphertext character strings; and the encryption result of encryption performed on the plaintext character string can be obtained according to the intercepted characters. The encryption result obtained by using the above method contains the ciphertext character strings obtained after the encryption is performed with the different encryption algorithms, and the ciphertext character strings contained in the encryption result are not complete ciphertext character strings, but the incomplete intercepted character strings, and therefore, the encryption method can assist in effectively preventing the encryption result from being subjected to collision attack, violent attack or rainbow table comparison attack compared with an encryption method according to which a single encryption algorithm is adopted to perform encryption to obtain complete ciphertext character strings, and therefore, the security of the encryption result can be improved.

The embodiment of the present invention discloses a credential stuffing attack monitoring method, including: obtaining the login information of the user's login behavior; calculating a credible stuffing attack risk value corresponding to at least one user behavior factor according to the login information of the user's login behavior; The credential stuffing attack risk value corresponding to the at least one user behavior factor determines the credential stuffing attack risk value of the user's current login behavior; according to the credential stuffing attack risk value of the user's current login behavior, locates the user The credential stuffing attack risk type of the current login behavior. The embodiment of the invention also discloses a credential stuffing attack monitoring device, system and computer storage medium.

The invention provides a collision attack test method and a device. The invention provides the collision attack test method aiming to solve chosen-plaintext attack of a key in an encryption algorithm of the prior art. The method comprises the following steps: receiving a plaintext; storing at least one part of the plaintext; judging whether the analogical number of the stored at least one part of the plaintext and other stored at least one part of the plaintext is more than or equal to a first threshold value; outputting a signal with an attack mode in the current plaintext if the analogical number is more thanor equal to the first threshold value, otherwise, outputting a normal signal; and repeating the steps before the next plaintext comes. The method and the device have the advantages that the method and the device can test the inputting plaintext with obvious attack mode and avoid the chosen-plaintext attack on the key.

The invention discloses a method, a system, a server and terminal equipment for authenticating identities on the basis of block chain networks. The method, the system, the server and the terminal equipment are used for authenticating the identities for nodes in the block chain networks. The method includes receiving login requests with user names; acquiring first block chain account addresses according to preliminarily stored corresponding relations between the user names and the first block chain account addresses; judging whether first transaction of payment from the first block chain account addresses to preset second block chain account addresses is available in block chains or not; determining that the identities of users are successfully authenticated if the first transaction is available in the block chains. The login requests are transmitted by the nodes. The first block chain account addresses are associated with the user names. The method, the system, the server and the terminal equipment have the advantages that transaction information stored in the block chains cannot be tampered and can be traced back and queried, and accordingly the authentication safety and the credibility of authentication procedures can be improved; the users do not need to input passwords during login and do not need to remember the passwords, accordingly, the convenience can be improved, and database collision attack due to the fact that other malicious personnel log in other websites by the aid of stolen user names and passwords can be prevented.