1590results about "Communication with homomorphic encryption" patented technology

A method includes encrypting information in accordance with an encryption scheme that uses a public key; encrypting a plurality of instances of a secret key, each being encrypted using at least one additional instance of the public key; sending the encrypted information and the plurality of encrypted instances of the secret key to a destination; receiving an encrypted result from the destination; and decrypting the encrypted result. A further method includes receiving a plurality of encrypted secret keys and information descriptive of a function to be performed on data; converting the information to a circuit configured to perform the function on the data; and applying the data to inputs of the circuit and evaluating the data using, in turn, the plurality of encrypted secret keys.

Blockchain-based, smart contract platforms have great promise to remove trust and add transparency to distributed applications. However, this benefit often comes at the cost of greatly reduced privacy. Techniques for implementing a privacy-preserving smart contract is described. The system can keep accounts private while not losing functionality and with only a limited performance overhead. This is achieved by building a confidential and anonymous token on top of a cryptocurrency. Multiple complex applications can also be built using the smart contract system.

In one exemplary embodiment of the invention, a method and computer program include: receiving first and second ciphertexts having first and second data encrypted per an encryption scheme, the encryption scheme has public/secret keys and encryption, decryption, operation and refresh functions, the encryption function encrypts data, the decryption decrypts ciphertext, the operation receives ciphertexts and performs operation(s) on them, the refresh operates to prevent growth of the magnitude of noise for a ciphertext while reducing the modulus of the ciphertext without using the secret key, utilizing a modulus switching technique that involves transforming a first ciphertext c modulo q into a second ciphertext c′ modulo p while preserving correctness, the technique includes scaling by p/q and rounding, p<q; using the operation function(s), performing operation(s) on them to obtain a third ciphertext; and reducing a noise level of the third ciphertext using the refresh function.

The invention belongs to the technical field of artificial intelligence, and relates to a combined deep learning training method based on a privacy protection technology. The efficient combined deep learning training method based on the privacy protection technology is achieved. In the invention, each participant first trains a local model on a private data set to obtain a local gradient, then performs Laplace noise disturbance on the local gradient, encrypts the local gradient and sends the encrypted local gradient to a cloud server; The cloud server performs aggregation operation on all thereceived local gradients and the ciphertext parameters of the last round, and broadcasts the generated ciphertext parameters; And finally, the participant decrypts the received ciphertext parameters and updates the local model so as to carry out subsequent training. According to the method, a homomorphic encryption scheme and a differential privacy technology are combined, a safe and efficient deep learning training method is provided, the accuracy of a training model is guaranteed, and meanwhile a server is prevented from inferring model parameters, training data privacy and internal attacksto obtain private information.

Aspects of the present invention provide systems and methods that facilitate computations that are publically defined while assuring the confidentiality of the input data provided, the generated output data, or both using homomorphic encryption on the contents of the secure distributed transaction ledger. Full homomorphic encryption schemes protect data while still enabling programs to accept it as input. In embodiments, using a homomorphic encryption data input into a secure distributed transaction ledger allows a consumer to employ highly motivated entities with excess compute capability to perform calculations on the consumer's behalf while assuring data confidentiality, correctness, and integrity as it propagates through the network.

One embodiment of the present invention provides a system for performing secure multiparty cloud computation. During operation, the system receives multiple encrypted datasets from multiple clients. An encrypted dataset associated with a client is encrypted from a corresponding plaintext dataset using a unique, client-specific encryption key. The system re-encrypts the multiple encrypted datasets to a target format, evaluates a function based on the re-encrypted multiple datasets to produce an evaluation outcome, and sends the evaluation outcome to the multiple clients, which are configured to cooperatively decrypt the evaluation outcome to obtain a plaintext evaluation outcome.

In one exemplary embodiment, a computer readable storage medium tangibly embodying a program of instructions executable by a machine for performing operations including: receiving information B to be encrypted as a ciphertext C in accordance with an encryption scheme having an encrypt function; and encrypting B in accordance with the encrypt function to obtain C, the scheme utilizes at least one public key A, where B, C, and A are matrices, the encrypt function receives as inputs A and B and outputs C as C→AS+pX+B (mod q), S is a random matrix, X is an error matrix, p is in integer, q is an odd prime number. In other exemplary embodiments, the encryption scheme includes a decrypt function that receives as inputs at least one private key T (a matrix) and C and outputs B as B=T⁻¹·(TCT^t mod q)·(T^t)⁻¹ mod p.

A confidentiality preserving system and method for performing a rank-ordered search and retrieval of contents of a data collection. The system includes at least one computer system including a search and retrieval algorithm using term frequency and/or similar features for rank-ordering selective contents of the data collection, and enabling secure retrieval of the selective contents based on the rank-order. The search and retrieval algorithm includes a baseline algorithm, a partially server oriented algorithm, and/or a fully server oriented algorithm. The partially and/or fully server oriented algorithms use homomorphic and/or order preserving encryption for enabling search capability from a user other than an owner of the contents of the data collection. The confidentiality preserving method includes using term frequency for rank-ordering selective contents of the data collection, and retrieving the selective contents based on the rank-order.

The invention discloses a multi-center block chain transaction privacy protection system and method. The system comprises an alliance control module, an amount verification module, a range verification module, an encryption module, a decryption module and a block chain system transaction module, wherein the alliance control module is used for generating alliance parameters by multiple participants; the amount verification module is used for verifying that input and output of an encrypted ciphertext amount in a transaction are equal; the range verification module is used for verifying that theencrypted ciphertext amount in the transaction is in a specific interval and is constantly positive; the encryption module and the decryption module are used for carrying out homomorphic encryption and decryption on the amount in transmission and reception processes; and the block chain system transaction module is used for complete bitcoin-like digital currency transaction systems, and has a complete transaction process which comprises transmission, reception, broadcasting and block confirmation. The system is capable of enhancing general structures through block chain transaction privacies under a multi-center supervision mode, so as to realize privacy protection for trapdoor parameters under joint control of multiple parties and transaction metadata in transaction process, and effectively strengthen the safety of plaintext amounts in multi-center block chain system transaction process.

The invention discloses a federated learning training data privacy enhancement method and system, and the method comprises the steps that a first server generates a public parameter and a main secretkey, and transmits the public parameter to a second server; a plurality of clients participating in federated learning generate respective public key and private key pairs based on the public parameters; the federated learning process is as follows: each client encrypts a model parameter obtained by local training by using a respective public key, and sends the encrypted model parameter and the corresponding public key to a first server through a second server; the first server carries out decryption based on the master key, obtains global model parameters through weighted average, carries outencryption by using a public key of each client, and sends the global model parameters to each client through the second server; and the clients carry out decrypting based on the respective private keys to obtain global model parameters, and the local models are improved, and the process is repeated until the local models of the clients converge. According to the method, a dual-server mode is combined with multi-key homomorphic encryption, so that the security of data and model parameters is ensured.

A system allows the identification and protection of sensitive data in a multiple ways, which can be combined for different workflows, data situations or use cases. The system scans datasets to identify sensitive data or identifying datasets, and to enable the anonymisation of sensitive or identifying datasets by processing that data to produce a safe copy. Furthermore, the system prevents access to a raw dataset. The system enables privacy preserving aggregate queries and computations. The system uses differentially private algorithms to reduce or prevent the risk of identification or disclosure of sensitive information. The system scales to big data and is implemented in a way that supports parallel execution on a distributed compute cluster.

A private stream aggregation (PSA) system contributes a user's data to a data aggregator without compromising the user's privacy. The system can begin by determining a private key for a local user in a set of users, wherein the sum of the private keys associated with the set of users and the data aggregator is equal to zero. The system also selects a set of data values associated with the local user. Then, the system encrypts individual data values in the set based in part on the private key to produce a set of encrypted data values, thereby allowing the data aggregator to decrypt an aggregate value across the set of users without decrypting individual data values associated with the set of users, and without interacting with the set of users while decrypting the aggregate value. The system also sends the set of encrypted data values to the data aggregator.

The invention discloses a model parameter training method and device based on federal learning, equipment and a medium. The method comprises the following steps: when a first terminal receives encrypted second data sent by a second terminal, obtaining a corresponding loss encryption value and a first gradient encryption value; randomly generating a random vector with the same dimension as the first gradient encryption value, performing fuzzy on the first gradient encryption value based on the random vector, and sending the fuzzy first gradient encryption value and the loss encryption value toa second terminal; when the decrypted first gradient value and the loss value returned by the second terminal are received, detecting whether the model to be trained is in a convergence state or not according to the decrypted loss value; and if yes, obtaining a second gradient value according to the random vector and the decrypted first gradient value, and determining the sample parameter corresponding to the second gradient value as the model parameter. According to the method, model training can be carried out only by using data of two federated parties without a trusted third party, so thatapplication limitation is avoided.

In one exemplary embodiment of the invention, a method for homomorphic decryption, including: providing a ciphertext with element c, there exists a big set B having N elements z_i so B={z₁,z₂, . . . , z_N}, there exists a small set S having n elements s_j so S={s₁, s₂, . . . , s_n}, the small set is a subset of the big set, summing up the elements of the small set yields the private key, there exists a bit vector {right arrow over (σ)} having N bits σ_i so {right arrow over (σ)}=σ₁, σ₂, . . . , σ_N, σ_i=1 if z_i ∈ S else σ_i=0, there exists an encrypted vector {right arrow over (d)} having N ciphertexts d_i so d=d₁, d₂, . . . , d_N, d_i is an encryption of σ_i; post-processing c by multiplying it by all z_i to obtain an intermediate vector {right arrow over (y)}=y₁, y₂, . . . , y_N with y_i computed y_i=c×z_i; homomorphically multiplying y_i by d_i obtaining a ciphertext vector {right arrow over (x)} having N ciphertexts x_i so z=x₁, x₂, . . . , x_N, where x_i is an encryption of the product y_i·σ_i; and homomorphically summing all x_i to obtain a resulting ciphertext that is an encryption of the at least one bit, where the big set is partitioned into n parts with each part having a plurality of different elements from the big set, where the elements of the small set are one element from each part.

A method of authorizing an operation to be performed on a targeted computing device is provided. The method includes generating a request to perform an operation on the targeted computing device, signing the request with a private key of a first private, public key pair, transmitting the request to an authentication server, receiving an authorization response from the authentication server that includes the request and an authorization token, and transmitting the authorization response to the targeted computing device.

A multi-party secure computing method is applied to any computing node deployed in a distributed network. A plurality of computing nodes are deployed in the distributed network, and the plurality of computing nodes participate in the multi-party secure computing together based on the privacy data held by the plurality of computing nodes respectively; Wherein the computing node is corresponding toa trusted key source; The method includes obtaining a trusted key from the trusted key source; Encrypting the held privacy data based on the obtained trusted key to obtain ciphertext data; sending atleast the ciphertext data as computational parameters to other computational nodes participating in the multi-party security computation to perform the multi-party security computation by the other computational nodes based on the collected computational parameters sent by each computational node participating in the multi-party security computation.

A method and apparatus are disclosed herein for classification. In one embodiment, the method comprises performing tree-based classification of a user input by a classifier with a classification tree at a first location, including exchanging data with a second location, different from the first location, to obtain the user input and provide results of classification to a user using singly homomorphic encryption so that the user input is not revealed to the classifier, the classification tree is not revealed to the user and the classifier's output is not revealed to the classifier.

In one exemplary embodiment of the invention, a method for evaluating at point r one or more polynomials p₁(x), . . . , p_l(x) of maximum degree up to n−1, where the polynomial p_i(x) has a degree of t_i−1, the method including: partitioning each polynomial p_i(x) into a bottom half p_i^bot(x) with bottom terms of lowest s_i coefficients and a top half p_i^top(x) with top terms of remaining t_i−s_i coefficients; recursively partitioning the bottom half p_i^bot(x) and the top half p_i^top(x) of each polynomial p_i(x) obtaining further terms having a lower degree than previous terms, performed until at least one condition is met yielding a plurality of partitioned terms; evaluating the bottom half p_i^bot(x) and the top half p_i^top(x) at the point r for each polynomial p_i(x) by evaluating the partitioned terms at the point r and iteratively combining the evaluated partitioned terms; and evaluating each polynomial p_i(x) at the point r by setting p_i(r)=r^{s<sub2>i</sub2>}p_i^top(r)+p_i^bot(r).

A system for performing distributed computing. The system comprises a plurality of compute node resources for performing computations for the distributed computing, a management resource for managing each of the compute node resources in the plurality, and a virtual cloud network. The management resource and the plurality of compute node resources are interconnected via the virtual cloud network.