Visa International Service Association

Assa Abloy Ab

Eric Le Saint

Marc B Kekicheff

Dominique Fedronic

Subramanian Kumaraswamy

Christian Aabye

Upendra S Mardikar

Payman Mohassel

Pratyay Mukherjee

Shashank Agrawal

Philippe Martin

Soumendra Bhattacharya

Jing Jin

James Gordon

Roopesh Joshi

John Boyer

Fahimeh Rezaei

Robert S Dulude

Yue Chen

Systems and methods are disclosed for performing a secure exchange of encryption keys (e.g., public keys) between two devices. One or more initialization keys are stored at both devices. In some embodiments, at least one device (e.g., a reader device) stores the initialization key(s) (e.g., a symmetric key, an asymmetric key pair) in local memory as part of performance of a manufacturing process for the device. The second device (e.g., a thin client device) may receive the initialization key(s) from an acceptance cloud (e.g., a server computer configured to perform terminal processing). The initialization key(s) are utilized to perform a secure exchange of the devices' respective public keys. Once these public keys are exchanged, the devices may proceed to establishing a secure connection with which subsequent operations may be performed.

Techniques for secure data exchanges

Embodiments of the invention relate to systems and methods for confidential mutual authentication. A first computer may blind its public key using a blinding factor. The first computer may generate a shared secret using its private key, the blinding factor, and a public key of a second computer. The first computer may encrypt the blinding factor and a certificate including its public key using the shared secret. The first computer may send its blinded public key, the encrypted blinding factor, and the encrypted certificate to the second computer. The second computer may generate the same shared secret using its private key and the blinded public key of the first computer. The second computer may authenticate the first computer by verifying its blinded public key using the blinding factor and the certificate of the first computer. The first computer authenticates the second computer similarly.

Mutual authentication of confidential communication

Systems and methods are for confidentially and securely provisioning data to an authenticated user device. A user device may register an authentication public key with an authentication server. The authentication public key may be signed by an attestation private key maintained by the user device. Once the user device is registered, a provisioning server may send an authentication request message including a challenge to the user device. The user device may sign the challenge using an authentication private key corresponding to the registered authentication public key, and may return the signed challenge to the provisioning server. In response, the provisioning server may provide provisioning data to the user device. The registration, authentication, and provisioning process may use public key cryptography while maintaining confidentiality of the user device, the provisioning server, and then authentication server.

Confidential authentication and provisioning

Systems and methods for secure peer-to-peer communications are described. Devices registered into trusted network may be capable of establishing a shared data encryption key (DEK). In embodiments, each device may be configured to obtain a share of a data encryption key (DEKi) that can be stored locally. The shares may be shares in an M of N Secret Sharing Scheme. This may involve a network that includes an integer, N, devices, and in which M devices may share a secret (i.e. the DEK) during communications, M being an integer less than or equal to N. To obtain the entire DEK during encryption/decryption, a requesting device may send requests to M of N devices for their shares of the DEK. Once M shares are obtained, they may be used generate the DEK for encrypting/decrypting data between the devices.

Secure shared key establishment for peer to peer communications

Methods and systems for consensus-based online authentication are provided. An encryption device may be authenticated based on an authentication cryptogram generated by the encryption device. The encryption device may transmit a request for security assessment to one or more support devices. The support devices may individually assess the encryption device, other security devices, and contextual information. The support devices may choose to participate in a multi-party computation with the encryption device based on the security assessments. Support devices that choose to participate may transmit one or more secret shares or partial computations to the encryption device. The encryption device may use the secret shares or partial computations to generate an authentication cryptogram. The authentication cryptogram may be transmitted to a decryption device, which may decrypt the authentication cryptogram, evaluate its contents, and authenticate the encryption device based on its contents.

Consensus-based online authentication

Embodiments extend protocols for secure communication between two parties to allow a party to securely communicate with multiple parties using a single message. For example, the sending party can determine a unique shared secret for each recipient and encrypt data for a recipient using a session key generated from the corresponding shared secret. The encrypted data can be combined into a single message, and each recipient can decrypt only the subset of the message that it is authorized to.

Systems and methods for secure multi-party communications using a proxy

Systems and methods for threshold authenticated encryption are provided. A collection of cryptographic devices may encrypt or decrypt a message, provided that a threshold number of those devices participate in the encryption process. One cryptographic device may generate a commitment message and transmit it to the other selected devices. Those devices may each perform a partial computation using the commitment message, and transmit the partial computations back to the encrypting or decrypting device. The encrypting or decrypting device may use those partial computations to produce a cryptographic key, which may then be used to encrypt or decrypt the message.

Multi-party threshold authenticated encryption

Embodiments of the invention relate to efficient methods for authenticated communication. In one embodiment, a first computing device can generate a key pair comprising a public key and a private key. The first computing device can generate a first shared secret using the private key and a static second device public key. The first computing device can encrypt request data using the first shared secret to obtain encrypted request data. The first computing device can send a request message including the encrypted request data and the public key to a server computer. Upon receiving a response message from the server computer, the first computing device can determine a second shared secret using the private key and the blinded static second device public key. The first computing device can then decrypt the encrypted response data from the response message to obtain response data.

Efficient methods for authenticated communication

A computer-implemented method performed by a user device is provided. The computer-implemented method includes receiving a message including an encrypted credential from a server computer; determining a response shared secret using a private key and a server public key; decrypting the encrypted credential using the response shared secret to determine a credential; obtaining a key derivation parameter from the credential; determining a first cryptogram key using the key derivation parameter; generating a first cryptogram using the first cryptogram key; and sending the first cryptogram to a second computer.

Methods for secure cryptogram generation

Techniques are provided to generate a secure communication for use in a transaction. In some embodiments, a user device is provided a first set of encryption keys associated with one or more authorizing entities. The user device may, prior to or during a transaction, receive one or more second encryption keys related to a second party to the transaction. In some embodiments, the one or more second encryption keys may be provided to the user device via a local communication means. Once the user device has been provided with transaction details, it may generate a transaction request using the multiple encryption keys that it has been provided, such that portions of the message are encrypted using different encryption keys.

Growing community of inventors

Los Altos, CA, United States of America

Eric Le Saint