Cryptography Research, Inc.

Rovi Solutions Corporation

Rambus Inc.

Irdeto Usa, Inc.

Irdeto B.v.

Joshua M Jaffe

Paul Carl Kocher

Benjamin C Jun

Pankaj Rohatgi

Peter K Pearson

Nathaniel James Lawson

Carter C Laren

Benjamin Che-Ming Jun

Matthew Thomas Carter

Nathaniel J Lawson

Paul C c/o Cryptography Research Inc Kocher

Paul C Kocher

Paul C Cryptography Research Inc Kocher

Paul c/o Cryptography Research Inc Kocher

Paul C c/o Crytography Research Inc Kocher

A method for performing a security chip protocol comprises receiving, by processing hardware of a security chip, a message from a first device as part of performing the security chip protocol. The processing hardware retrieves a secret value from secure storage hardware operatively coupled to the processing hardware. The processing hardware determines a path through a key tree based at least in part on the message. The processing hardware derives a validator at least in part from the secret value using a sequence of entropy redistribution operations associated with the path through the key tree. The processing hardware exchanges the validator between the security chip and the first device as part of the security chip protocol in order to authenticate at least one of the security chip or the first device.

Security chip with resistance to external monitoring attacks

A method for device authentication comprises receiving, by processing hardware of a first device, a message from a second device to authenticate the first device. The processing hardware retrieves a secret value from secure storage hardware operatively coupled to the processing hardware. The processing hardware derives a validator from the secret value using a path through a key tree. The first device then sends the validator to the second device.

Apparatus with anticounterfeiting measures

Methods and systems for masking certain cryptographic operations in a manner designed to defeat side-channel attacks are disclosed herein. Squaring operations can be masked to make squaring operations indistinguishable or less distinguishable from multiplication operations. In general, squaring operations are converted into multiplication operations by masking them asymmetrically. Additional methods and systems are disclosed for defeating DPA, cross-correlation, and high-order DPA attacks against modular exponentiation.

Asymmetrically masked multiplication

A computing device includes a secure storage hardware to store a secret value and processing hardware comprising at least one of a cache or a memory. During a secure boot process the processing hardware loads untrusted data into at least one of the cache or the memory of the processing hardware, the untrusted data comprising an encrypted data segment and a validator, retrieves the secret value from the secure storage hardware, derives an initial key based at least in part on an identifier associated with the encrypted data segment and the secret value, verifies, using the validator, whether the encrypted data segment has been modified, and decrypts the encrypted data segment using a first decryption key derived from the initial key to produce a decrypted data segment responsive to verifying that the encrypted data segment has not been modified.

Secure processor with resistance to external monitoring attacks

A method for device authentication comprises receiving, by processing hardware of a first device, a message from a second device to authenticate the first device. The processing hardware retrieves a secret value from secure storage hardware operatively coupled to the processing hardware. The processing hardware derives a validator from the secret value using a path through a key tree, wherein the path is based on the message, wherein deriving the validator using the path through the key tree comprises computing a plurality of successive intermediate keys starting with a value based on the secret value and leading to the validator, wherein each successive intermediate key is derived based on at least a portion of the message and a prior key. The first device then sends the validator to the second device.

System and method for secure authentication

A device includes storage hardware to store a secret value and processing hardware coupled to the storage hardware. The processing hardware is to receive an encrypted data segment with a validator and derive a decryption key using the secret value and a plurality of entropy distribution operations. The processing hardware is further to verify, using the received validator, that the encrypted data segment has not been modified. The processing hardware is further to decrypt the encrypted data segment using the decryption key to produce a decrypted data segment responsive to verifying that the encrypted data segment has not been modified.

Detection of data tampering of encrypted data

Methods and devices disclosed herein use techniques to resist glitch attacks when computing discrete-log based signatures. The methods and systems described herein replace the random nonce in conventional signature systems with a pseudorandom nonce derived in a deterministic way from some internal state information, such as a secret key or a counter, such that the nonce is not repeated. The methods and systems described herein may also use tests to verify that a glitch has not occurred or been introduced.

Methods and systems for glitch-resistant cryptographic signing

Secure boot with resistance to differential power analysis and other external monitoring attacks

To prevent piracy, audiovisual content is encrypted prior to transmission to consumers. A low-cost, high-security cryptographic rights module (such as a smartcard) enables devices such as players/displays to decode such content. Security-critical functions may be performed by the cryptographic module in a manner that allows security compromises to be addressed by upgrading or replacing cryptographic modules, thereby avoiding the need to replace or modify other (typically much higher-cost) components. The security module contains cryptographic keys, which it uses to process rights enablement messages (REMs) and key derivation messages (KDMs). From a REM and KDM, the security module derives key data corresponding to content, uses public key and/or symmetric cryptography to re-encrypt the derived key data for another device, and provides the re-encrypted key data to the decoding device. The decoding device then uses cryptographic values derived from the re-encrypted key data to decrypt the content.

Specialized circuitry for cryptographic authentication and other purposes

Information leaked from smart cards and other tamper resistant cryptographic devices can be statistically analyzed to determine keys or other secret data. A data collection and analysis system is configured with an analog-to-digital converter connected to measure the device's consumption of electrical power, or some other property of the target device, that varies during the device's processing. As the target device performs cryptographic operations, data from the A/D converter are recorded for each cryptographic operation. The stored data are then processed using statistical analysis, yielding the entire key, or partial information about the key that can be used to accelerate a brute force search or other attack.

Differential power analysis&#x2014;resistant cryptographic processing

A bitstream for configuration of a programmable logic device is received, the bitstream comprising a data segment and authentication data associated with the data segment. The programmable logic device computes a hash of the data segment. The programmable logic device compares the computed hash of the data segment with the authentication data. Configuration of the programmable logic device halts responsive to a determination that the computed hash of the data segment does not match the authentication data. Configuration of the programmable logic device using the data segment continues responsive to a determination that the computed hash of the data segment matches the authentication data.

Bitstream confirmation for configuration of a programmable logic device

Techniques usable by devices to encrypt and decrypt sensitive data to in a manner that provides security from external monitoring attacks. The encrypting device has access to a base secret cryptographic value (key) that is also known to the decrypting device. The sensitive data are decomposed into segments, and each segment is encrypted with a separate encryption key derived from the base key and a message identifier to create a set of encrypted segments. The encrypting device uses the base secret cryptographic value to create validators that prove that the encrypted segments for this message identifier were created by a device with access to the base key. The decrypting device, upon receiving an encrypted segments and validator(s), uses the validator to verify the message identifier and that the encrypted segment are unmodified, then uses a cryptographic key derived from the base key and message identifier to decrypt the segments.

Programmable logic device with resistance to external monitoring attacks

Technologies are disclosed to transfer responsibility and control over security from player makers to content authors by enabling integration of security logic and content. An exemplary optical disc carries an encrypted digital video title combined with data processing operations that implement the title's security policies and decryption processes. Player devices include a processing environment (e.g., a real-time virtual machine), which plays content by interpreting its processing operations. Players also provide procedure calls to enable content code to load data from media, perform network communications, determine playback environment configurations, access secure nonvolatile storage, submit data to CODECs for output, and/or perform cryptographic operations. Content can insert forensic watermarks in decoded output for tracing pirate copies. If pirates compromise a player or title, future content can be mastered with security features that, for example, block the attack, revoke pirated media, or use native code to correct player vulnerabilities.

Growing community of inventors

San Francisco, CA, United States of America

Joshua M Jaffe