31 results about "Quantum signature" patented technology

The invention discloses an arbitration quantum signature method based on glass color sampling random unitary operation. The arbitration quantum signature method comprises an initialization stage, a signature stage and a verification stage. The initialization stage is used for preparing a secret key and establishing a communication system; the signature stage is used for selecting a proper signature algorithm to design the signature of the transmission information; and the verification stage is used for verifying the validity of the signer and the integrity and authenticity of original information. According to the invention, unitary operation encryption based on glass color sampling is adopted in the signature of transmission information designed in arbitration quantum signature; an m-modequantum state is transferred by adopting quantum walk invisible transmission based on a graph, a necessary entanglement state for invisible transmission does not need to be prepared in advance, the safety is higher by adopting a common channel and a random tuple, and a glass color sampling model and a quantum walk invisible transmission model are proved to be realized through a linear optical network; and therefore, the method disclosed by the invention is high in safety, resource-saving and easy to implement in experiment.

The invention discloses a post-quantum encryption and decryption method and system based on an identity label, equipment and a medium, and belongs to the field of cryptography, and the method comprises the following steps: a key generation center generates a sender private key and a receiver private key by using an identity-based post-quantum private key generation algorithm; a sender signs a message plaintext by using a sender private key by using an identity-based post-quantum signature algorithm, sequentially performs splicing compression and symmetric encryption on signature data and the message plaintext, performs identity-based post-quantum encryption on a session key by using a receiver ID, and sends encrypted data and an encrypted session key to the receiver; and a receiver performs identity-based post quantum decryption on the encrypted session key by using the receiver private key, performs symmetric decryption on the encrypted data, performs decompression separation on the decrypted data to obtain a message plaintext and signature data, and performs identity-based post quantum verification by using the sender ID. The message encryption security is improved.

The invention discloses a public key arbitration quantum signature protocol based on quantum block encryption, which belongs to the technical field of quantum secret communication and comprises quantum key sharing among a signer, a receiver and arbitration through quantum key distribution. The signer prepares two parts of sub-messages and one part of sub-signature, sends one part of sub-message tothe receiver and sends the quantum signature to arbitration; And the receiver verifies the quantum signature under the constraint condition provided by arbitration. The protocol provided by the invention not only can ensure the security, but also has a better practical application value.

The invention discloses an arbitration quantum signature method based on XOR encryption. The method comprises a signer Alice, a receiver Bob, an arbiter Trent and a three-particle GHZ state quantum key shared by the three parties, the three-particle GHZ state is an entangled resource commonly used in quantum communication, and the signature method comprises the following steps: an initialization stage, a signature stage and a verification stage. The signer Alice, the receiver Bob and the arbiter Trent share the three-particle GHZ state and respectively keep own particle information secret; byusing a traditional XOR encryption and decryption method, a quantum message is encrypted and signed by sharing the GHZ state; by introducing a decoy photon state, the flow of a conventional arbitration quantum signature protocol is improved, the requirements of unforgeability and non-repudiation are met, and finally, it can be seen that encryption of the protocol does not involve a complex encryption method or complex quantum operation, so that the method is more practical than other methods.

This specification discloses a quantum public-key cryptosystem. The quantum public-key cryptosystem may use two rotation operators R_{{circumflex over (n)}}(θ) and R_{{circumflex over (m)}}(φ) satisfying a cyclic evolution. The two rotation operators R_{{circumflex over (n)}}(θ) and R_{{circumflex over (m)}}(φ) do not have a commutation relation or an anti-commutation relation with each other. The commutation relation or the anti-commutation relation is established when either of the following conditions is satisfied: θ=2iπ, φ=2jπ, or {circumflex over (n)}·{circumflex over (m)}=1 (i, j=integer), and θ=(2k+1)π, φ=(2l+1)π, or {circumflex over (n)}·{circumflex over (m)}=0 (k, l=integer).

Provided is a quantum check transaction method based on a block chain digital signature. A quantum check generation module, a quantum check, a payment transfer module, a block chain, a block, a quantum key generation module, a quantum signature module, a digital signature and a quantum signature verification module are adopted. The method comprises the steps that: 1, the quantum key generation module distributes a quantum key for a quantum check; 2, a user A applies to the quantum check generation module for a quantum check; 3, the user A uses the quantum signature module to sign the quantum check; 4, a user B verifies the digital signature through the quantum signature verification module; 5, the payment transfer module completes quantum check payment; and 6, a quantum check payment account book is stored in the block chain. According to the method, the security and efficiency of check transaction can be ensured to the greatest extent in a trust-free network, the method has theoretical absolute security and quantum attack resistance, and the check account book stored in the block chain has traceability and tamper-proofing performance.

Cryptographic methods and systems are described. An example cryptographic system may include a signature engine to digitally sign a message using fuzzy data associated with a signee. The signature engine is configured to generate a digital signature using a lattice instantiation and a linear sketch. The linear sketch is configured based on the lattice instantiation. The digital signature is a function of the fuzzy data and the message and uses a signature-time signing key residing within a signing key space. The signing key space is a space defined by the lattice instantiation. An example of a verification engine is also described. The verification engine is configured to receive the message and the digital signature and to verify the message as signed by the signee. The verification engine is configured to obtain key data for the signee comprising at least an initialisation-time verification key, to compute a distance metric based on the key data and the received digital signature, the distance metric indicating a measure of difference for the signature-time verification key, and to indicate a verification failure responsive to the distance metric being greater than a predefined homomorphic threshold. The methods and systems may be used as an authentication mechanism.

The invention discloses a fault-tolerant quantum digital signature method capable of resisting collective noise. The fault-tolerant quantum digital signature method specifically comprises the following steps: step 1, a sender Alice generating a quantum signature and sending the quantum signature to a receiver Bob and a receiver Charlie; step 11, Alice generating two same copy sequences; step 12, the sender Alice sending the quantum signature to the receiver Bob and the receiver Charlie respectively; step 13, the receiver Bob and the receiver Charlie randomly selecting half of the received quantum signatures and sending the quantum signatures to the receiver Bob and the receiver Charlie; step 14, for all signature elements in the hand at present, the receiver Bob and the receiver Charlie being measured; step 2, the sender Alice sending an information private key pair (k, PKk) to the receiver Bob, and when the Bob meets the receiving condition, forwarding the information private key pair (k, PKk) to the receiver Charlie. According to the method disclosed by the invention, the decoherence-free subspace is introduced, and the physical quantum states with the same noise factor are utilized to form the logic quantum state, so that the quantum information is not influenced by collective noise in the transmission process, and the fidelity of the communication process is improved.

The invention discloses a quantum cash settlement system and method based on a block chain. The system comprises a quantum cash settlement system, a quantum cash key management system, a quantum cash bank and a quantum cash settlement block chain. The invention discloses a quantum cash settlement method based on a block chain. The quantum cash settlement method comprises a quantum cash extraction process, a quantum cash payment process and a quantum cash deposit process. A user can register in a quantum cash settlement system, and after the identity and legality are verified, a quantum cash bank account can be created; a user completes quantum signature through the quantum cash key management system, extraction and payment of quantum cash can be completed from a quantum cash bank account, or the quantum cash is stored in the quantum cash bank account, and all related data and settlement records of the user are stored in a quantum cash settlement block chain. According to the scheme, the reliability of quantum cash settlement is ensured by combining a block chain technology and a quantum encryption technology, and unconditional security is theoretically achieved.

The invention provides a member revocable certificateless anti-quantum signature method based on a cloud server, which belongs to the field of information security, and mainly comprises five steps of a system initialization algorithm, a key SKID generation algorithm, a signature algorithm, a verification algorithm and a member revocation algorithm. According to the scheme, the revocable certificateless signature is established on a lattice cryptosystem, so that the scheme can resist quantum computer attacks, and higher security is achieved; a certificateless signature system is used in the scheme, and a key generation center is introduced, so that the certificate storage pressure is reduced, the risk is shared, and the system stability is improved; the revocation of the user is realized by means of the cloud server, and the secret key is divided into the partial secret key and the update secret key, so that the task of member revocation is completed by the cloud server, the computing pressure of the center is reduced, and the system is more reliable.

The invention relates to an anti-quantum signature verification method based on isolation witness. A configuration module, a secret key module, an approval module, a verification module and a signature node are included. According to the method, defense measures of multiple side channel attacks are integrated, and a one-time signature scheme is adopted, so that the average signature is shorter, the secret key generation, signature and verification efficiency is higher, and the adaptability is higher than that of public key signature.

The invention discloses a decentralized quantum Byzantine consensus method which comprises a message broadcasting stage and a message integration stage, the message broadcasting stage is composed of a plurality of message distribution wheels, and in each message distribution wheel, a main node distributes messages to other auxiliary nodes in the wheel; other auxiliary nodes verify and record the received messages, and message distribution is realized by using a three-party quantum signature technology, so that anti-counterfeiting performance and anti-repudiation performance are ensured; in the message integration stage, each node independently utilizes a major function to carry out multi-round statistical integration on a message statistical list in the node, and a finally output message is determined. According to the method, all good nodes, namely non-malicious nodes, are ensured to output consistent consensus conclusions finally; and under the condition that one good node serves as the initial main node, it can be ensured that finally, messages output by all the good nodes consistently are just the values distributed by the good initial main node in the initial message distribution round.

The invention provides a novel arbitration quantum signature method based on XOR encryption and a GHZ state. The novel arbitration quantum signature method comprises three steps of initialization, signature generation and signature verification. Firstly, an arbiter and a signer use a group of one-way hash functions and share a shared key; secondly, the signer performs quantum coding on the quantum message by using a key control hash function, and performs control NOT gate operation on the quantum message by using a control bit in a GHZ state to generate a quantum signature; and finally, a verifier performs similar XOR operation to verify the signature by using the control bit in the GHZ state. Compared with other arbitration quantum signature methods, key distribution and encryption of the method do not involve complex encryption methods or quantum operations, and forgery attacks and denial attacks can be effectively resisted; on the basis of meeting the requirements of safety, unforgeability and non-repudiation, the method disclosed by the invention is more practical and higher in efficiency.

The invention relates to the technical field of key generation, provides a key generation hardware acceleration architecture and method based on Hash post-quantum signature, and designs a high-speed and telescopic hardware acceleration architecture based on the characteristics of an algorithm and a parameter set in an LMS key generation process. The architecture is designed to be suitable for all parameter sets of an LMS scheme, low time delay and high hardware utilization rate can be achieved at the same time through appropriate parallel design, and the architecture keeps certain constant power when different parameters are achieved, and power attack can be helped to be resisted to a certain extent.

Techniques of generating a lattice-based verification matrix and signature vector are disclosed. The method enables generating device to sample a gadget matrix and then generate a reduced gadget matrix. The generating device may then sample a trapdoor matrix and use the trapdoor matrix and the reduced gadget matrix to generate a verification matrix. A sending device may receive the trapdoor matrix and the verification matrix from the generating device, in addition to receiving a message. The sending device may then use the trapdoor matrix and the verification matrix to generate a signature vector for the message. A verification device can receive the verification matrix, the message, and the signature vector. The verification device may use the verification matrix and the signature vector to verify the message.

A sensor can selectively detect quantum signatures in charge transfer processes via a tunneling current. The sensor can be designed to preferentially detect certain modulations in the tunneling current that can be indicative of a polarization mode or a range of polarization modes of a predetermined analyte. In one aspect, the sensor can include a metal electrode having a first surface and a secondsurface. The sensor can also include an insulator film having a first thickness, a first surface area and a first surface chemistry. The insulator film can be coupled to the metal electrode via the first surface. The sensor can also include a functionalization film having a second thickness, a second surface area and a second surface chemistry. The functionalization film can be coupled to the metal electrode via the second surface.