Cryptography Research, Inc.

Winthrop Wu

Scott C Best

Mark Evan Marson

Helena Handschuh

Bryan Jason Wang

Craig Edward Hampel

Pankaj Rohatgi

Elke De Mulder

Sami James Saab

Samatha Gummalla

Jeremy Cooper

Michael Alexander Hamburg

Marufa Kaniz

Matthew Evan Orzen

Guilherme Ozari De Almeida

Joel Patrick Wittenauer

Qinglai Xiao

Ashish Raj

Aspects of the present disclosure involve a method and a system to perform the method to obtain a cryptographic output of a plurality of rounds of a cipher, by performing a plurality of modified rounds of the cipher, each of the modified rounds computing an unmasking transform, an operation of a respective round of the cipher, and a masking transform, the unmasking transform being an inverse of the masking transform of a previous round of the cipher.

Protection of cryptographic substitution-permutation networks from fault injection attacks

A request to perform a memory operation addressed to a first address corresponding to a first logical unit of logical units of a memory is received. Address mask data that corresponds to the logical units is identified. Multiple transformed addresses are determined using the first address and the address mask data. The transformed addresses can include a target address corresponding to the first logical unit and additional addresses corresponding to other logical units. The memory operation is performed at the target address corresponding to the first logical unit and dummy memory operations are performed at the additional addresses corresponding to the additional logical units.

Obfuscation of data in a memory

A value corresponding to a physical variation of a device may be received. Furthermore, helper data associated with the physical variation of the device may be received. A result data may be generated based on a combination of the value corresponding to the physical variation of the device and the helper data. An error correction operation may be performed on the result data to identify one or more code words associated with the error correction operation. Subsequently, a target data may be generated based on the one or more code words.

Generating a target data based on a function associated with a physical variation of a device

Described herein are technologies for application authentication and/or data encryption without stored pre-shared keys. In one resource controller, a processing device receives an application identifier (ID) from the application. The processing device provides a current nonce responsive to the application ID and provides the application access to the system resource responsive to determining that a hash of a current key received from the application equals a current tag. The current key is generated by the application based on code of the application and the current nonce. The current tag was previously provided from the application to the resource controller. The current tag can also be hashed by the application using the current key.

Application authentication and data encryption without stored pre-shared keys

Disclosed systems and techniques are directed to efficient integrity monitoring of computational operations using multiple memory arrays collectively representative of known events associated with the computational operations. Disclosed techniques include obtaining event identification value representative of a state of the computing device associated with execution of an operation on the computing device, obtaining memory pointers and selecting, based on the memory pointers, mapping values from multiple memory arrays, computing an event response value, and classifying the operation among a plurality of classes, based on the event response value.

Efficient integrity monitoring of processing operations with multiple memory arrays

A DMA system includes two or more DMA engines that facilitate transfers of data through a shared memory. The DMA engines may operate independently of each other and with different throughputs. A data flow control module controls data flow through the shared memory by tracking status information of data blocks in the shared memory. The data flow control module updates the status information in response to read and write operations to indicate whether each block includes valid data that has not yet been read or if the block has been read and is available for writing. The data flow control module shares the status information with the DMA engines via a side-channel interface to enable the DMA engines to determine which block to write to or read from.

Data flow control module for autonomous flow control of multiple DMA engines

A computing system includes a host device and a root of trust (RoT) device for performing batch encryption and decryption operations facilitated by a direct memory access (DMA) engine. The host device generates a command table for batch processing of a set of address tables that each describe a set of data blocks of a file to be encrypted or decrypted. The DMA engine facilitates a DMA transfer of the command table from the host memory to an RoT memory of the RoT device. The RoT device then performs batch processing of the address tables referenced in the command table. For each address table, the DMA engine copies a set of data blocks from the host memory to the RoT memory, a cryptographic engine encrypts or decrypts the data blocks, and the DMA engine copies the transformed data blocks back to the host memory.

Batch transfer of commands and data in a secure computer system

Embodiments herein facilitate resisting side channel attacks through various implementations and combinations of implementations. In embodiments, this is accomplished by preventing sensitive data from consecutively following other data through potentially vulnerable resources which otherwise may cause data to leak. Where such vulnerabilities to attacks are known, suspected, or as a proactive precaution, a cleaner can be used to inhibit the sensitive data from passing through the vulnerable areas consecutively and thus inhibit the leakage. Embodiments also envision utilizing certain types of circuits to assist in preventing leakage. By using such circuits one can reduce or even potentially eliminate the requirement for cleaners as mentioned previously.

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Pleasanton, CA, United States of America

Winthrop Wu