219 results about "Digital Signature Algorithm" patented technology

Secure computation environments are protected from bogus or rogue load modules, executables and other data elements through use of digital signatures, seals and certificates issued by a verifying authority. A verifying authority-which may be a trusted independent third party-tests the load modules or other executables to verify that their corresponding specifications are accurate and complete, and then digitally signs the load module or other executable based on tamper resistance work factor classification. Secure computation environments with different tamper resistance work factors use different verification digital signature authentication techniques (e.g., different signature algorithms and/or signature verification keys)-allowing one tamper resistance work factor environment to protect itself against load modules from another, different tamper resistance work factor environment. Several dissimilar digital signature algorithms may be used to reduce vulnerability from algorithm compromise, and subsets of multiple digital signatures may be used to reduce the scope of any specific compromise.

The invention discloses a consortium chain permission control method based on digital certificates and a CA authentication system. In a consortium chain, the enrollment control and automatic authorization of the consortium chain are realized through a layered digital certificate issuance system. The method of the invention pre-defines three kinds of permission mechanisms for respectively controlling enrollment permissions between consortium chain nodes, role permissions of the consortium chain nodes and access permissions of blockchain users. Three kinds of digital certificates including the enrollment certificate, role certificate and transaction certificate are used for respectively controlling the three permissions of node enrollment, role identification and client enrollment. An internationally accepted elliptic curve digital signature algorithm or a national crypto digital signature algorithm is used for achieving the generation of the digital certificates and secure message signature and validation, the defects of being large in permission granularity of a traditional blockchain or even having no enrollment functions and the like are overcome, the blockchain users are provided with anonymous transaction features, the security of blockchain transactions is improved, and the privacy needs of the users are met.

A security management system can log, investigate, respond, and track computer security incidents that can occur in a networked computer system. In other words, the security management system can produce a security record of information related to the tracking of suspicious computer activity or actual computer security threats, such as denial of service attacks or other similar compromises to computers or computer networks. The security record can include, but is not limited to, date and times of computer security incidents, a name for a particular security incident, a security management system user, and a potential source of the computer security incident. The security record can be designed as a running log that saves or records all activity of a computer incident source as well as the activity of the security team responding to the computer incident source. To produce the security record, all data that relates to a computer incident and all data that relates to a computer incident response can be sent to a separate protected database, where data is protected by digital signature algorithms (DSAs).

The invention discloses a digital signature method and a digital signature system based on an SM2-based identity base. The method firstly generates system parameters and system master, public, and private keys, and the user sends the identity identifier to the KGC for registration to obtain a signature private key, and then generates and verifies the digital signature of message M by using the signature private key. In the signature process of the invention, since a new type of user private key is generated based on the unchangeable overall architecture of the SM2 signature algorithm, the user's signature private key is generated based on the identity of the user without public key certificate, maintenance and management of the public key certificate as well as time-consuming calculation,thereby ensuring that the signature method of the invention has the characteristics such as low complexity, high security, and easy verification.

The invention discloses a two-way-security-authentication-based data downloading method and a two-way-security-authentication-based data downloading system. The method comprises that: a first terminal verifies a second terminal through a symmetric key algorithm to acquire a first verification result; after the second terminal is determined to be a legal terminal according to the first verification result, the second terminal verifies the first terminal through an asymmetric key algorithm to acquire a second verification result; and after the first terminal is determined to be a legal terminal according to the second verification result, the second terminal downloads data which is encrypted through a digital signature algorithm to the first terminal. By the method and the system, the creation of two-way authentication channels and security downloading among different terminals can be realized, and the security and integrity of interactive data are protected.

Techniques for implementing a digital signature algorithm in electronic computer hardware include computing the multiplicative inverse of a particular integer modulo a prime modulus by computing a first quantity modulo the prime modulus. The first quantity substantially equals, modulo the prime modulus, the particular integer raised to a power of a second quantity. The second quantity is two less than the prime modulus. The techniques allow an integrated circuit block to compute a modulo multiplicative inverse, such as for signing and verifying digital signatures, using existing blocks of circuitry that consume considerably less area on a chip, and incur fewer developmental costs, than an implementation of an algorithm conventionally used in software.

The invention relates to a system for generating, verifying and mixing digital signatures of p-element domain SM2 elliptic curves. The system functions through the following steps: m' which is obtained by combining a message (m) to be signed with a signer hash value (ZA) is sent to a password hash module; r which is obtained through r=(e+x1)mod n is sent to an s generation module; when r=0, r+k=n or s=0, a random number generation module is notified to regenerate k; r and s are used as signature control centers for output of the digital signature of m; password hash computation is performed to m' to generate the password hash module of the combined message hash value e; the random number generation module of the random number k is generated; k doubling computation is performed to the base G of an elliptic curve; the generated coordinate (x1,y1) is used as the doubling computation module of the result [k]G; and the s generation module is generated according to s=[(1+dA)<-1>*(k-r*dA)] mod n, where n is the order of the elliptic curve, and dA is the private key of the signer. According to the invention, the digital signature algorithm in the SM2 elliptic curve public-key algorithm can be achieved through hardware.

A biometric signature system generates a digital signature for electronic documents using biometric information as a secret key. Registration commitment information is generated by performing expansion conversion on a predetermined secret key and embedding the resulting secret key in feature data of biometric information of a user, and a set with a corresponding public key. A pair of one-time secret and public keys is generated for digital signature feature data of the biometric information of the user, and a digital signature for a message is generated using the one-time secret key. A digital signature commitment is generated and a set of the one-time public key and the digital signature is output as the biometric digital signature. The digital signature is verified using the one-time public key. A differential secret key is calculated and a correspondence of the differential secret key, the one-time public key and the public key is verified.

The invention discloses a cloud-storage data lightweight-level public auditing method with privacy protection. The method comprises the steps of system initialization, signature, auditing certification, and auditing certification verification. The method uses a modified digital signature algorithm based on an elliptical curve, the security of the method depends on the discrete logarithm problem of a finite group of the elliptical curve, and the method is characterized by low signature length, small storage space and high computation speed, and is especially suitable for occasions with lightweight-level computation amount, limited storage space and high-efficiency realization. The method of the invention is simple and convenient to operate, solves the problems that cloud-storage data public auditing and present cloud-storage data are low in privacy and the completeness and accuracy of user data cannot be ensured, and ensures that original user data is not leaked out to a cloud server or a public auditor.

Authentication and provenance of physical assets may be achieved by attaching a cryptographically strong RFID tag including a physically unclonable function and public-key cryptography logic which implements a digital signature algorithm. The cryptographically strong RFID tag directly participates in a novel implementation of blockchain technology, constructing an indelible and cryptographically provable record of authenticity and provenance with a new level of trustworthiness to protect physical assets.

The invention relates to an implementation system of a p-element domain SM2 elliptic curve public key cryptographic algorithm. Under the control of a master control module, the system can utilize a signature control center and a verification control center to control the implementation of a digital signature algorithm, utilize an initiator control center and a responder control center to control the implementation of a key exchange protocol, utilize an encryption party control center and a decryption party control center to control the implementation of a public key encryption algorithm, utilize an S generation module, a random number generation module, a point doubling module, a point addition module and a key derivation module to implement basic operation in the algorithm and utilize an upper-layer reelection module to implement multiplexing of the modules, thereby reducing the use of hardware resources. The implementation system disclosed by the invention can implement the p-element domain SM2 elliptic curve public key cryptographic algorithm by hardware.

A method is provided of authenticating a digitally signed message. A chain of messages is generated. A Winternitz pair of keys is generated for each respective message. A sequence number is assigned to each of the messages. Each of the sequence numbers cooperatively identify an order of Winternitz verifiers assigned to each of the messages. A signature to a first message in the chain of messages is signed using a digital signature algorithm private key. Signatures to each of the following messages in the chain of messages are signed using both Winternitz private keys and digital signature algorithm private keys. The signed messages are broadcast from a sender to a receiver. The first signed broadcast message is authenticated at the receiver by verifying the digital signature algorithm signature. At least some of the following signed broadcast messages are authenticated at the receiver by verifying only the Winternitz signature.

The invention discloses a group signature method based on an elliptic curve, comprising the following six steps: 1, selecting two multiplication cyclic groups G1 and G2 with the order of p from the elliptic curve as well as a nonsingular bilinear mapping e which can map elements in the G1 and G2 into GT, namely e:G1*G2->GT; 2, operating a secret key generation algorithm by a group administrator, generating a group public key, and generating signature secrete keys for members in the groups; 3, operating a signature algorithm after members in the groups obtain corresponding signature secret keys through the secret key generation algorithm; 4, verifying the validity of signatures delta by adopting the group public key to operate a verification algorithm by a verifier; 5, as for a given signature, adopting a signature tracking algorithm to substitute revocation identification of a time slot in which the signature is generated into a revocation identification inequation, and if the inequation is true, indicating that the signature is signed by a group member corresponding to the revocation identification; and 6, in some cases, adopting a member revocation algorithm to revoke the signature qualification of some members, which requires to calculate the revocation identification of the members in corresponding time intervals and publish the revocation identification in a revocation list.

The invention relates to a method for encoding information of a user and generating a two-dimension code digital key by adopting a digital signature technique. A mobile phone and other mobile devices are taken as carriers of the two-dimension code digital key. The method comprises steps as follows: a credible key generation center allocates a unique private/ public key pair for a user account and a smart lock storage unit during starting; a digital signature algorithm is adopted, that is, a private key is used for encrypting the information of the user and a public key is used for decrypting a read-in two-dimension code sequence; the information of the user is stored and read by field. Normal use of the two-dimension code key of the user can be guaranteed, the reliability and the authenticity of the source of a generated temporary two-dimension code key can be guaranteed, meanwhile, temporary two-dimension code keys received by different people can be effectively distinguished, and the flexibility and the safety of a whole two-dimension code smart lock system are unified.

The invention provides a mobile information system based privacy protection and encryption method. On the basis of the existing security model, a DES (data encryption standard) and ECC (error checking and correcting) based digital signature algorithm scheme is provided, the scheme has the advantages of rapid arithmetic speed and high security, and better fits the application in a wireless environment, and according to the digital signature algorithm, plaintext data is encrypted by using the DES, so that the encryption and decryption speed problem of plaintexts is solved preferably; a session key of the DES is encrypted by using an ECC algorithm, so that the problem of key distribution can be effectively solved; meanwhile, through carrying out digital signature on the digital digests of plaintexts, the identity can be identified, and a situation that whether information is changed in the process of transmission can be authenticated; and therefore, the purpose of rapid and secure mobile officing is achieved, and the authenticity, integrity, and non-repudiation of officing information are ensured.

Applications can transparently use a bus, such as the IEEE-1394 serial bus, as if it were an Ethernet (IEEE 802.3). In a conventional Ethernet, each node is assigned a unique 6-byte MAC address in order to receive frames addressed to it over the LAN. According to the invention, IEEE-1394 bus node identifiers are mapped to Ethernet MAC addresses using for example a digital signature algorithm. Ethernet frames are then “wrapped” into 1394 bus packets and addressed to the destination node using the hashed address. The receiver unwraps the 1394 packet and restores the Ethernet frame to its original form. An optimum packet size for transmission of Ethernet packets over the 1394 bus is selected with reference to speed topology maps in the 1394 bus nodes, and this optimum size is transmitted to bus nodes. This packet size is reported to TCP to specify the packet size, and all packets larger than that size are fragmented and reassembled at the receiving node. The protocol works transparently across networks that are linked via bridges.

The invention provides an electronic signature authentication method based on an ellipse curve signature algorithm, which comprises the following steps that: a user utilizes a digital signature verification algorithm in an ellipse curve cryptosystem to perform signature operation on electronic information, and embeds the signature information in a stamp frame or an interior position of a stamp electronic seal template in a digital watermark form to perform electronic signature on appointed electronic documents; and a verification party utilizes the digital signature verification algorithm in the ellipse curve cryptosystem to verify the information of the electronic signature, wherein the digital signature algorithm and the verification algorithm in the ellipse curve cryptosystem are based on an international standard ECDSA method; and twice dot product operation of the prior signature verification algorithm is changed into once dot product operation by utilizing the deformation of a signature equation of the digital signature verification algorithm in the ellipse curve cryptosystem.

The invention discloses a novel procuration signature and verification method based on integer factorization problems. The novel procuration signature and verification method based on the integer factorization problems includes the steps: before a network operates, firstly generating personal public keys and private keys by original signature people and procuration signature people, and issuing the public keys; when signature requests are provided, generating authorization letters by the original signature people, and calculating signature authorization based on a chameleon hash function and an ordinary digital signature algorithm, sending the signature authorization to the procuration signature people, carrying out validity verification on the received signature authorization by the procuration signature people, if the signature authorization is effective, generating the procuration signature based on collision property of the chameleon hash function, and digital signature does not need to be carried out on information, when a verifier receives the authorization letters and the procuration signature, firstly, verifying whether the authorization letters are effective or not, after the authorization letters are verified to be effective, and then verifying validity of the procuration signature. According to the application of the novel procuration signature and verification method based on the integer factorization problems, processing efficiency of the procuration signature is high, and the length of the procuration signature is short. The novel procuration signature and verification method based on the integer factorization problems is suitable for environments such as mobile networks and the wireless networks where computing power and network bandwidth are limited.

The invention belongs to the technical field of information security, and in particular relates to a batch self-auditing method for cloud storage data. The method of the present invention mainly includes: generating a public-private key pair based on an elliptic curve digital signature algorithm, a public-private key pair of a lightweight signature algorithm, and a lightweight symmetric encryption algorithm: calculating digital signatures of multiple data files, data files Tags and ciphertexts of data files are sent to the cloud server; cloud users generate audit challenge information and send it to the cloud server; the cloud server returns the aggregated audit proof response information to the cloud user; cloud users For the response information, use the digital signature algorithm based on the elliptic curve and the symmetric encryption algorithm to verify the legitimacy of the aggregated audit proof response. The beneficial effect of the present invention is that it solves the problem of batch integrity verification of cloud storage data, enabling users to effectively verify the integrity of multiple data files at the same time.

The invention discloses a digital signature method and system. The method comprises obtaining a PDF file corresponding to a to-sign user identity information and a PDF file Hash value; receiving the identity information of the to-sign user; sending the identity information and the PDF file Hash value to a signature end; receiving an identity information Hash value, IBE signature information and an IBE public key which are generated by the signature end according to the identity information and the PDF file Hash value; writing the identity information Hash value, the IBE signature information and the IBE public key into a PDF file signature domain to complete digital signature. By means of the method and the system, the digital signature can be achieved without issuing digital certificates to users, the system is convenient to operate, the signature efficiency is high, real-time IBE secret keys are generated according to user identity information, and counterfeit is difficulty, accordingly, potential safety hazards and digital signature costs can be reduced.

The invention relates to a method for performing copyright management by utilizing digital audio watermarking. The method comprises the following steps: embedding a watermarking signal in a logarithm domain of the audio signal energy so that the decoding is unrelated to the amplitude; reasonably designing the frame structure of the embedded watermarking information so that the timing statistical accuracy of a de-embedded result reaches second, and the decoding time accuracy and decoding accuracy rate are not influenced under the operations of cutting, splicing and inserting other audio signals and the like; encrypting the embedded information by an RSA (Asymmetric Algorithm) digital signature algorithm so that the embedded information has security; and effectively reducing interference of the carrier audio to the watermarking information by the embedding algorithm by using the relativity of the short-time stability of the audio so as to obviously improve the success rate and accuracy rate solved by the watermarking. In the method, a digital watermarking technology is introduced to identify the audio materials in a medium library, and then the broadcast flow or audio file are decoded and analyzed to obtain the service conditions of materials, thereby acquiring copyright payment information.

The invention discloses an SM2 signature algorithm-based double-check signature method. The method comprises the following steps: receiving an SM2 double-check signature request from a user, wherein the SM2 double-check signature request comprises a message p1 of bank transaction information of the user; analyzing the message p1 of the bank transaction information of the valid user to generate transaction information p2; displaying the analyzed transaction information p2 to the user for check and confirmation; detecting whether a confirmation signal from the user is received, if so, respectively calculating a hash value hash1=H(Z, p1) of the message p1 of the bank transaction information of the user and a hash value hash2=H(p2) of the transaction information p2 by using a hash algorithm, and generating a random number k which belongs to [1, n-1]; performing a point multiplication operation of an elliptic curve on a random number k and a base point G of the elliptic curve E to obtain a point kG on the elliptic curve E. By adopting the SM2 signature algorithm-based double-check signature method, the technical problem that user fund is stolen by online banking transaction hijacking, transaction manipulation and remote control which easily happen in the conventional method is solved.