Patent application number | Description | Published |
20100246822 | SECURELY PROVIDING SECRET DATA FROM A SENDER TO A RECEIVER - The invention provides a system and a method for securely providing a secret data from a sender to one or more receivers. The receiver uses a sequence of functions originating from a hierarchy of functions to migrate the secret data from an input transform space to an output transform space using a mathematical transformation under control of one or more seeds. The seeds are provided to the receiver by the sender. The sender conditionally allows the receiver to obtain the secret data by controlling the seeds. | 09-30-2010 |
20100251285 | CONDITIONAL ENTITLEMENT PROCESSING FOR OBTAINING A CONTROL WORD - Embodiments of the invention provide an improved method and an improved receiver for obtaining a control word. Two or more subkeys are obtained in a receiver. Each subkey was encrypted under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the control word. Typically at least one of the entitlement messages is a positive entitlement message and at least one of the entitlement messages is a negative entitlement message. Embodiments of the invention can be used in a conditional access system such as a Pay-TV system. | 09-30-2010 |
20110067012 | SYSTEM AND METHOD FOR GENERATING WHITE-BOX IMPLEMENTATIONS OF SOFTWARE APPLICATIONS - A development suite for generating files, such as DRM-protected files, using white-box cryptography. The suite consists of a code generation tool, a data transformation engine, and a white-box data generation tool, and a white-box library. In the white-box cryptography context, the data transformation engine is used to protect the boundary between the cryptographic operation and the surrounding code. In particular, the data transformation engine is used to apply data transformations to the inputs to and outputs from the cryptographic operations. If the user specifies that transformations are required via a white-box parameterization file, the code generation tool puts the information specified by the user into a form the data transformation engine understands, namely as qualifiers on data variables and function prototypes. The data transformation engine then applies the specified transformations, and passes information to the data generation tool regarding which transformations were chosen. | 03-17-2011 |
20130024699 | System and Method for Protecting Cryptographic Assets From a White-Box Attack - A digital signature generation (DSG) process which provides resistance against white box attackers is disclosed. This is done by applying specially selected data transformations to the inputs, outputs and internal parameters of the algorithm. In particular, the signatory's private key does not appear in the clear in our protected implementation. Our new white box implementation produces signatures that are compatible with signatures created by conventional implementations; thus our solution facilitates interoperability and can be used as a drop-in replacement for conventional implementations. In particular, we describe transformations to the key (d) and the generator domain parameter (usually denoted G or g) of the digital signature generation processes, such that embodiments of the invention can produce signed messages which appear to a verifier as if the key (d) was used, without actually ever using the key (d). This makes it impossible for an adversary to ever observe the key (d), as it is not actually used. Further embodiments include additional protections to make it even harder for an adversary to deduce the key (d) by observing the process which generates the digital signature. | 01-24-2013 |
20130125090 | System and Method for Efficiently Deploying Massively Diverse Program Instances to Resist Differential Attacks - A system and method for producing a massive number of diverse program instances so as to deter differential attacks, collusion, and similar hostile actions. Code portions are shown to be defined in various manners, instantiated, and aggregated. The system and method establishes a very large number of program instances that may be deployed. Furthermore, testing is accomplished over a minimal set of instances to provide for high test coverage and high confidence over the fully deployed instance set without incurring a high testing penalty. | 05-16-2013 |
20140019771 | Method and System for Protecting Execution of Cryptographic Hash Functions - A method of protecting the execution of a cryptographic hash function, such as SHA-256, in a computing environment where inputs, outputs and intermediate values can be observed. The method consists of encoding input messages so that hash function inputs are placed in a transformed domain, and then applying a transformed cryptographic hash function to produce an encoded output digest; the transformed cryptographic hash function implements the cryptographic hash function in the transformed domain. | 01-16-2014 |
20140362987 | SECURELY PROVIDING SECRET DATA FROM A SENDER TO A RECEIVER - The invention provides a system and a method for securely providing a secret data from a sender to one or more receivers. The receiver uses a sequence of functions originating from a hierarchy of functions to migrate the secret data from an input transform space to an output transform space using a mathematical transformation under control of one or more seeds. The seeds are provided to the receiver by the sender. The sender conditionally allows the receiver to obtain the secret data by controlling the seeds. | 12-11-2014 |
20150124964 | CONDITIONAL ENTITLEMENT PROCESSING FOR OBTAINING A CONTROL WORD - Embodiments of the invention provide an improved method and an improved receiver for obtaining a control word. Two or more subkeys are obtained in a receiver. Each subkey was encrypted under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the control word. Typically at least one of the entitlement messages is a positive entitlement message and at least one of the entitlement messages is a negative entitlement message. Embodiments of the invention can be used in a conditional access system such as a Pay-TV system. | 05-07-2015 |