67 results about "Composite number" patented technology

The invention discloses a secure transaction verification method and a secure transaction verification system based on a blockchain. The secure transaction verification method comprises the steps that: when a transaction with a transaction type and a transaction amount is processed by a node on the blockchain, an original balance of each transaction party is decrypted through a first decryption parameter transmitted by the transaction party, calculation is performed on the each original balance to obtain a new balance, the new balance is encrypted through an encryption parameter transmitted bythe transaction party to obtain an encrypted new balance, and the each encrypted new balance is broadcast to each node on the blockchain; after the broadcast encrypted new balance of the each transaction party is received by the node on the blockchain, an intelligent contract is activated to perform composite number verification; if the each composite number verification is passed, update is performed based on the corresponding encrypted new balance respectively; an external minus balance verification system is called to perform minus balance verification on single account balance, if the each minus balance verification is passed, it is judged that the transaction verification is passed. The secure transaction verification method and the secure transaction verification system of the invention have the beneficial effects that: whether a transaction is normal can be verified, and transaction processing speed on the blockchain also can be ensured without occupying system overhead.

A method is provided for an escrow cryptosystem that is essentially overhead-free, does not require a cryptographic tamper-proof hardware implementation (i.e., can be done in software), is publicly verifiable, and cannot be used subliminally to enable a shadow public key system. The keys generated are based on composite numbers (like RSA keys). A shadow public key system is an unescrowed public key system that is publicly displayed in a covert fashion. The keys generated by the method are auto-recoverable and auto-certifiable (abbrev. ARC). The ARC Cryptosystem is based on a key generation mechanism that outputs a public/private key pair, and a certificate of proof that the key is recoverable by the escrow authorities. Each generated public/private key pair can be verified efficiently to be escrowed properly by anyone. The verification procedure does not use the private key. Hence, the general public has an efficient way of making sure that any given individual's private key is escrowed properly, and the trusted authorities will be able to access the private key if needed. Since the verification can be performed by anyone, there is no need for a special trusted entity, known in the art as a "trusted third party". Furthermore, the system is designed so that its internals can be made publicly scrutinizable (e.g., it can be distributed in source code form). This differs from many schemes which require that the escrowing device be tamper-proof hardware. The system is efficient and can be implemented as a "drop-in" replacement to an RSA or Rabin cryptosystem. The system is applicable for law-enforcement, file systems, e-mail systems, certified e-mail systems, and any scenario in which public key cryptography can be employed and where private keys or information encrypted under public keys need to be recoverable. Another aspect of the system is the possibility to organize it in a hierarchical tree structure, where each element in the tree is an escrow authority (or authorities) capable to recover keys and/or information encrypted under these keys within the subtree rooted at the authority (or authorities) and only within this subtree.

A method is provided for generating a group digital signature wherein each of a group of individuals may sign a message M to create a group digital signature S, wherein M corresponds to a number representative of a message, 0≦M≦n−1, n is a composite number formed from the product of a number k of distinct random prime factors p₁·p₂· . . . ·p_k, k is an integer greater than 2, and S≡M^d(mod n). The method may include: performing a first partial digital signature subtask on a message M using a first individual private key to produce a first partial digital signature S₁; performing at least a second partial digital signature subtask on the message M using a second individual private key to produce a second partial digital signature S₂; and combining the partial digital signature results to produce a group digital signature S.

The invention discloses a cloud storage ciphertext retrieval method and system. The method includes the following steps: (1) a step of generating a public key and a private key at a retrieval end; (2) an encryption step; (3) a step of generating a retrieval trap door; (4) a retrieval implementation step; (5) a decryption step. Through implementation of the cloud storage ciphertext retrieval method and system, the cloud storage ciphertext retrieval supports a retrieval strategy of nest of logic words such as AND, OR and NOT and the like and users are helped to accurately obtain needed data and thus the transmission cost is reduced and the method and system have the advantages of being simple in process and high in calculation efficiency. At the same time, the cloud storage ciphertext retrieval method and system adopt composite number order group and bilinear pairing for construction and thus known plaintext distribution regularity attacks and attacks targeted at access modes are effectively prevented and thus the security is comparatively high.

The invention relates to a dual-carboxylate gemini surfactant resistant to high temperature and high salt and a preparation method thereof, which mainly solve the problems that in the prior art, an oil displacement agent containing the surfactant has the defects of low oil displacement efficiency and high using concentration in high-temperature and high-salt conditions and alkali in the trinary alkali-surfactant-polymer flooding brings about corrosion and scale depositing to the stratum and oil wells. In the invention, a technical scheme of N, N-dual-fatty acyl diamine dioxin-propionic acid dioxin-polyoxyethylene ether dual-carboxylate with a general molecular formula shown in the specification is adopted and favorably solves the problem, wherein in the general molecular formula, M is selected from any one of metal ions of potassium, sodium or lithium, R1 is C9 to C17alkyl groups, R2 is C2 to C6 alkyl groups, n is an additive composite number of ethoxy groups (EP) and has the value range of any on integral number from 2 to 7; and the dual-carboxylate gemini surfactant resistant to high temperature and high salt can be applicable to the tertiary oil recovery of oil fields.

The invention provides a novel safe outsourcing algorithm applied to RSA decryption. The algorithm satisfies an equation M=C<d>mod n, wherein input values are a ciphertext C, a private key d and a modulus n, the modulus n is a large composite number, factors p and q are provided, namely n=pq, and an output value is a plaintext m. Large module power multiplication is considered to be outsourced toa cloud server, so that a user only needs to execute a small amount of calculation to realize a decryption process of the RSA. Due to the fact that the scheme of the outsourcing calculation needs to meet the defined safety, in other words, the privacy, the correctness and the high-efficiency verification of input and output are achieved. According to the scheme, the indexes and the modulus in theRSA decryption process and the decrypted plaintext are protected, the calculation amount of a user side can be reduced after the outsourcing decryption calculation is carried out, and meanwhile, the safety requirement can be met.

The invention discloses an RSA key pair fast generation system and an RSA key pair fast generation method. The system comprises a CPU core, a cipher coprocessor, a prime number generator, and a memory. The prime number generator is used for filtering composite numbers, is implemented in hardware form, supports 256-bit, 512-bit, 1024-bit, 2048-bit and 4096-bit composite number filtering, and completes modular redundancy, calculation and identification table setting. According to the RSA key pair fast generation method, in order to realize fast key pair retrieving, filtering and judging in an asymmetric algorithm, a hardware-based composite number filtering scheme is adopted, optimized modular exponentiation and improved Montgomery modular multiplication are employed, and the existing prime number decision algorithm is optimized. Thus, efficient prime number screening is realized, the key pair generation speed is increased, and the problem that the generation of an RSA key pair takes long in the existing encryption and decryption technology is solved.

The invention discloses an anti-leakage CP-ABE (Ciphertext Policy-Attribute-Based Encryption) method under strategy hiding and outsourcing decryption. The anti-leakage CP-ABE method under strategy hiding and outsourcing decryption mainly realizes a CP-ABE scheme with three characteristics: leakage resistance, strategy hiding and outsourcing decryption, and belongs to the information safety field. The anti-leakage CP-ABE method under strategy hiding and outsourcing decryption utilizes a composite number order bilinear group to construct parameters, and adds the elements in a sub group Gp2 of the composite number order bilinear group in the main public key and the encryption algorithm to achieve the effect of hiding the access strategy. Besides, the algorithm decomposes the decryption process and adds an outsourcing decryption algorithm, and at the same time utilizes a double key system to enable the third party to be unable to completely decrypt the cryptograph, thus reducing the computing cost and guaranteeing safety of the user private key and the cryptograph. Compared with traditional anti-leakage scheme, the anti-leakage CP-ABE method under strategy hiding and outsourcing decryption has the advantages of leakage resistance, strategy hiding, outsourcing decryption, and higher safety, and greatly reduces the computing cost for decryption for the user.

The present invention is a novel hydrotalcite compound that is environmentally friendly and exhibits an excellent metal corrosion inhibiting effect by the addition of a small amount thereof, and an inorganic ion scavenger employing same; the hydrotalcite compound is represented by Formula (1), has a hydrotalcite compound peak in the powder X-ray diffraction pattern, the peak intensity at 2θ=11.4° to 11.7° being at least 3,500 cps, and has a BET specific surface area of greater than 30 m²/g.

Mg_aAl_b(OH)_c(CO₃)_d·nH₂O  (1)

In Formula (1), a, b, c, and d are positive numbers and satisfy 2a+3b−c−2d=0. Furthermore, n denotes hydration number and is 0 or a positive number.

The invention relates to a binary compound flooding compound and a preparation method thereof, mainly solving the problems that the oil displacement agent containing surface active agents has poor oil displacement efficiency and high using concentration under the high-temperature and high-salt conditions, and corrosion and scale deposition to a stratum and an oil well, caused by alkali in the ternary compound flooding, happen in the prior art. The binary compound flooding compound comprises the following components in percentage by weight: (1) 0.01-5.0 percent of N,N-bi fatty acyl group diamine neopentanoic acid di-polyoxyethylene ether bisulphonate; (2) 0.01-3.0 percent of polymer; (3) 92.0-99.98 percent of formation water, wherein in the general molecular formula of the component (1), R1 is C9-C17 alkyl group, R2 is C2-C6 alkyl group, n is adding composite number of ethoxy groups (EO) and is one integer from 2-7; M is one metal ion of K, Na or Li; the polymer is selected from one ofpolyacrylamide with superhigh molecular weight (viscosityaverage molecular weight is 25,000,000), temperature-resisting and salt-resisting polymer or xanthogen gum, and water is selected from the formation water of the oil field. By the technical scheme, the problems are better solved, and the binary compound flooding compound is suitable for tertiary oil recovery production in the oil field.

The invention relates to an oil displacement compound for tertiary oil recovery and a preparation method thereof, mainly aiming at solving the problems that oil displacement agent containing surface active agents has poor oil displacement efficiency and high using concentration under the high-temperature and high-salt conditions, and corrosion and scale deposition to a stratum and an oil well, caused by alkali in the ternary compound flooding, happen in the prior art. The oil displacement compound for tertiary oil recovery comprises the following components according to mass percentage: (1) 0.01-5.0 percent of N,N-bi fatty acyl group diamine neopentanoic acid di-polyoxyethylene ether bisulphonate; (2) 0.01-3.0 percent of polymer; (3) 92.0-99.98 percent of formation water, wherein in the general molecular formula of the component (1), R1 is C9-C17 alkyl group, R2 is C2-C6 alkyl group, n is composite number of ethoxy groups (EO) and is one integer from 2-7; M is one metal ion of K, Na or Li; the polymer is selected from one of polyacrylamide with superhigh molecular weight (viscosityaverage molecular weight is 25,000,000), temperature resisting salt-resisting polymer or xanthogen gum, and water is selected from the formation water of the oil field. By the technical scheme, the problems are better solved, and the oil displacement compound is suitable for tertiary oil recovery production in the oil field.

A process is provided for searching in parallel for a plurality of prime number values simultaneously includes the steps of: randomly generating a plurality of k random odd numbers (wherein k is preferably more than 2, but could also be one or more) expressed as n_0,0, n_1,0, . . . n_((k−1)),0, each number providing a prime number candidate; determining a plurality of y additional odd numbers based on each one of the randomly generated odd numbers n_0,0, n_1,0, . . . n_(k−1),0 to provide additional prime number candidates thereby yielding a total number of prime number candidates; sieving the total number of prime number candidates by performing a small divisor test on each of the candidates in order to eliminate candidates revealed to be composite numbers by the small divisor test thereby yielding a sieved number s of candidates; and performing a first probabilistic primality test on each of the sieved number s of candidates, each of the plurality of s first primality tests including an associated exponentiation operation executed by an associated one of a plurality of s of the exponentiation units, the exponentiation operations being performed by the plurality of s exponentiation units substantially simultaneously in order to eliminate candidates revealed to be composite numbers by the primality test thereby yielding a remaining number r of candidates.

The invention discloses a method for quickly generating a prime number group applicable to an information encryption technology. The method comprises the following steps of: establishing a probable prime number group by selecting a shrinkage residual system of a modulus M which is equal to 30; and according to the distribution rule and characteristics of composite numbers in the probable prime number group, screening out all composite numbers in the probable prime number group so as to accurately, quickly and completely generate all prime numbers of any section in a storage limitation range of a computer. In the field of information safety and cryptology, the acquisition and providing of large prime numbers are necessary flows in a public key algorithm. The convention method has the defects that: a single prime number can be provided at each time; most of the prime numbers are required to be subjected to primality detection; and operation time is over-long. The method provided by the invention has the advantages that: the primer number group can be generated by adopting computer software through simple screening operation, so that quick generation without complicated operation is realized on the computer; and a primality detection link is eliminated, and limitation of a prime number generation technology can be avoided, so that one-time pad can be realized, and related public key systems can perfectly work.

The technique of the present invention attains simple and accurate evaluation of the performance of a fuel cell and enables produce of a high-performance electrode catalyst and a high-performance fuel cell. The procedure makes platinum, a noble metal, and iron, a base metal, carried on carbon having a large specific surface area, and heats up the carbon with platinum and iron to a specific temperature to reduce iron. A resulting platinum-iron alloy electrode catalyst exerts excellent catalytic functions. A fuel cell using this electrode catalyst has a high IR compensation voltage. The quantity of carbon monoxide adsorbed by this novel electrode catalyst is not less than 14 Ncc per one gram of platinum. The atomic number ratio of iron (Fe) to platinum (Pt) in the catalyst is not lower than 0.14 by EDX analysis, and the ratio of the binding number of Pt atom with Fe atom to the total binding number relating to Pt atom is not lower than 0.10 by EXAFS analysis. Each electrode catalyst produced is evaluated by measurement of these data. The fuel cell including the electrode catalyst having the favorable result of evaluation ensures the desired performances.

The invention discloses a quick large number decomposition method based on cryptographic technology application. The creative quick large number decomposition method organically combining the congruence theory and the composite number distribution rule includes the steps of compressing positive integers, setting up an almost prime number group, selecting a maximum dereferencing range, generating the almost prime number group, decomposing a large number, setting digits, deleting composite numbers and the like. The method different from traditional large number decomposition methods can be used for quick factorization of any large number selected from n without depending on computing speed, and quick decomposition can be realized by using computer software for simple identification processing instead of a great amount of time-consuming complex operations. Therefore, evaluation and improvement of relevant public key system safety can be greatly promoted, and the quick large number decomposition method is widely applicable to the field of information safety and cryptographic technology application.

The invention discloses an attribute-based encryption method of a revocable key policy in a standard model. A user private key and a specified access structure are bound, after the private key is extracted, the attribute-based encryption is performed in an encryption attribute set and an attribute revocation set, and then decryption is performed. When a receiver receives a ciphertext for decryption, if the attribute set in the ciphertext satisfies the access structure in the user private key, a plaintext message is output, or otherwise, refusal is output. According to the attribute-based encryption method of the revocable key policy, based on a static assumption, the double-system encryption technology and the composite-number-order bilinear pairing are employed, the proposed scheme is proved to be safe in the standard model, two functions of attribute revocation and encryption can be realized, and user privacy is protected.

A method and apparatus are disclosed for improving public key encryption and decryption schemes that employ a composite number formed from three or more distinct primes. The encryption or decryption tasks may be broken down into sub-tasks to obtain encrypted or decrypted sub-parts that are then combined using a form of the Chinese Remainder Theorem to obtain the encrypted or decrypted value. A parallel encryption/decryption architecture is disclosed to take advantage of the inventive method.

The invention discloses a solid-phase synthesis method for magnesium borohydride ammoniates. The solid-phase synthesis method comprises the following step of: performing ball milling on magnesium borohydride and an ammonia source under the atmosphere of protective gas to obtain the magnesium borohydride ammoniate. According to the solid-phase synthesis method for the magnesium borohydride ammoniates, the complicated operation processes of filtration, distillation and solvent removal in traditional methods are avoided, and the problem that organic waste liquid needs to be specially treated is solved; the product yield is increased; a series of magnesium borohydride ammoniates with different ammonia complexing numbers can be prepared; the operation is simple; the product purity is high; the yields of the magnesium borohydride ammoniates are respectively higher than 95 percent; the dehydriding temperature of the obtained product is about 130 DEG C; and the hydrogen discharge amount is higher than 13 weight percent (wt%).

The invention provides an electricity storage device, comprising N energy units equal in voltage and capable of providing at least three output voltages. N is a composite number; each of the N energyunits is equally divided into a plurality of energy unit modules; each energy unit module has a module inner control portion. In the initial state, the module inner control portions connect the energyunits in the same energy unit module in parallel. Different plugs are connected with the electricity storage device in order to allow the electricity storage device to output one of at least three output voltages to an electric tool using the electricity storage device. Therefore, the applicable range of the electricity storage device is widened, and the application cost is reduced.

The invention provides an electricity storage device and an electric tool using the same. The electricity storage device comprises N energy units equal in voltage and capable of providing at least three output voltages. N is a composite number; each of the N energy units is equally divided into a plurality of energy unit modules; each energy unit module has a module inner control portion. In the initial state, the module inner control portions connect the energy units in the same energy unit module in parallel. Different plugs are connected with the electricity storage device in order to allowthe electricity storage device to output one of at least three output voltages to the electric tool using the electricity storage device. Therefore, the applicable range of the electricity storage device is widened, and the application cost is reduced.

The invention discloses a prime number generating method applied to cryptology application. A random number and a series of small prime numbers are subjected to prime number pre-detection through a method for solving the greatest common divisor, only when the random number and the small prime numbers are relatively prime, the random number and the small prime numbers pass the prime number pre-detection, and the random number passing the prime number pre-detection is subjected to prime detection. Because one part of composite numbers can be eliminated though a pre-detection method, the cycle index of the prime detection after the pre-detection can be greatly reduced. In the traditional prime number generating method, the random number is directly subjected to the prime detection, so massive prime detection operation is needed to be performed; and under the general implemented condition, the time of the prime detection is far longer than that of solving the greatest common divisor, so the method provided by the invention can greatly improve the operating speed and time for generating the prime number.

The invention relates to a magnesium-based nano composite hydrogen storage material and a preparation method thereof and belongs to the technical field of functional materials. The temperature requirement of application is met by forming an ammoniated hydroboron by magnesium hydroboron and ammonium, and positive hydrogen energy introduced into a NH3 group can be combined with negative hydrogen ina BH4<-> group to release hydrogen, so that the hydrogen release path of the hydroboron is changed and release of impurity gas such as boroethane is reduced effectively; the ammonium complexing quantity is changed by means of an ammonium re-distributing method to prepare mono-ammoniated magnesium hydroboron, that is, the combining efficiency is the highest from the aspect of charge balance by adjusting the quantities of positive and negative hydrogen in ammoniated magnesium hydroboron, release of ammonia in a decomposing process of the magnesium hydroboron ammonate can be inhibited effectively, the purity of hydrogen released is improved, and meanwhile, the magnesium-based nano composite hydrogen storage material is combined with a magnesium-based alloy, so that the crystal structure of analloy hydride is changed and a catalytic effect role is played, and therefore, diffusion of hydrogen atoms is facilitated, and the kinetic performance of absorbing and releasing hydrogen by the alloyhydride is improved.

The invention discloses a user identity encryption method based on a composite number order group. The method comprises an initialization stage, a secret key generation stage, an encryption stage, a decryption stage and a trap door generation stage. In the test stage, the cloud server matches every two ciphertexts according to the ciphertext and the trap door corresponding to the same identity provided by each user, if matching succeeds, '1' is output, and otherwise '0' is output. According to the user identity encryption method based on the composite number order group provided by the invention, the ciphertext of the keyword can be matched, the privacy of user data on the cloud can be ensured while the keyword search function is completed, and the certificate management problem of the user does not need to be worried about, so that the requirement of higher security guarantee of important information in cloud computing is met.