32 results about "Rainbow table" patented technology

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 invention discloses a high-speed space-time computing platform, which includes a storage module, an FPGA parallel array module and an external interface computer, and the storage module and the FPGA parallel array module are connected to the external interface computer; The results are compressed and stored, and SSDs are used to query the collision points in parallel; the FPGA parallel array module is used to distribute encryption to each individual FPGA chip in parallel, and to find the collision point of the rainbow table through multiple FPGA chips running in parallel; the external interface computer is used to The way of socket provides the deciphering of MD5, Sha1, Sha256 and DES. The present invention combines many years of experience in password deciphering, on the basis of the existing FPGA parallel array module, adopts the rainbow table processing scheme, develops a high-speed space-time computing platform, adopts a time-space balance mode for password deciphering, and quickly deciphers the plaintext of the password within a certain range. Assist the security department to quickly obtain evidence and handle cases.

The invention discloses a word2003 document cracking system based on FPGA hardware and a method. The system comprises a PC, an input interface module, a crack module and an output interface module which are connected sequentially, and the PC is connected with the output interface module. The crack module comprises a sub-key generation module, a rainbow table matching module and a key cracking module which are connected sequentially. The sub-key generation module includes sub-key round robin controller, MD5 algorithm module and RC4 algorithm module which are connected sequentially. The key cracking module consists of algorithm round robin controller, MD5 algorithm module and RC4 algorithm module. The system achieves document cracking by using the time and space folding algorithm of the rainbow table, thus improving the crack efficiency and reducing the cracking time. On the basis of considering the technical characteristics of the rainbow table and the FPGA, the appropriate rainbow table is used for cracking, thus solving the contradiction between cracking time and resource consumption.

Embodiments of the invention provide a number detection method and device. The number detection method is applied to a server, and comprises the steps: obtaining query data sent by a client, the querydata being data of a previous preset number of bits after a target number is processed by an MD5 algorithm; determining to-be-determined number data matched with the query data in a preset rainbow table covering the whole network number; determining feature information of the to-be-determined number corresponding to the to-be-determined data according to the to-be-determined number data in combination with a feature database of the whole network number; and sending the feature information of the to-be-determined number to the client. Therefore, a plaintext is not adopted when the number is detected, the privacy of the user is protected, and the security is improved.

The invention discloses a password attack method, device and heterogeneous acceleration platform. The method is applied to a heterogeneous platform including a CPU end and an FPGA end, including: the FPGA end reads a pre-stored rainbow table and ciphertext data to be attacked; According to the preset password attack algorithm, the ciphertext data to be attacked is processed in parallel to obtain the password data to be selected; the FPGA side matches the password data to be selected with the rainbow table according to the preset matching algorithm to find out the candidate password; The terminal returns a completion signal to the CPU terminal. It can be seen that this application utilizes FPGA to perform hardware acceleration of the cryptographic attack algorithm, and the FPGA executes the cryptographic attack algorithm in parallel, which improves the parallelism of the algorithm, improves the throughput performance of the algorithm execution, and then improves the performance of the cryptographic attack algorithm based on the rainbow table . Furthermore, the redundancy and fine-grained parallelism at the FPGA side make the hardware cost lower.

The invention discloses a PDF document recovery device and method; the device comprises the following units: an overall key obtain unit using a rainbow table to obtain the overall key of a to-be-decrypted document; a PDF title and linearization parameter dictionary object generation unit used for generating a title and linearization parameter dictionary object content; a cross-reference table generation unit used for generating a main cross-reference table and a second cross-reference table; a tail dictionary generation unit used for generating a tail dictionary corresponding to the main cross-reference table and second cross-reference table; an object number processing unit used for processing a decrypted object number; an indirect reference object processing unit used for processing object numbers of all reference objects in the present object; an object content processing unit used for determining the type of the object content, and decrypting a flow object. The novel device and method can neglect the initial deviant calculating difficulty caused by content length changes before and after decryption; modularization design is convenient, thus fast recovering PDF documents.

A code recovery system and a recovery method based on a generator and an extended rainbow table belong to the technical field of computer safety and comprise an extended rainbow table generating module, a plurality of clients of an extended rainbow table recovering module and a server, wherein the server is connected with a plurality of network nodes and comprises a data mining module, a memorizer and a system initialization module. A user manages the work of the data mining module and the system initialization module of the server through managing the work of terminal networks. The data mining module of the server generates a generator dictionary; the system initialization module of the server generates a distributed initialized configuration file; the distributed initialized configuration file comprises generator dictionary information and is connected with the extended rainbow table generating module and the extended rainbow table recovering module of the network nodes and is used for transmitting system initialization configuration information. The code recovery system and the recovery method based on the generator and the extended rainbow table achieve the purpose that a long instruction rainbow table is generated within a receptible time range by reducing plaintext space and reduces the recovery time of an artificial instruction.