NAGRASTAR LLC Patent applications |
Patent application number | Title | Published |
20140282685 | SYSTEMS AND METHODS FOR PERFORMING TRANSPORT I/O - Systems and methods for implementing a Transport I/O system are described. Network encrypted content may be received by a device. The device may provide the network encrypted content to a secure processor, such as, for example, a smart card. The secure processor obtains a network control word that may be used to decrypt the network encrypted content. The secure processor may decrypt the network encrypted content to produce clear content. In embodiments, the secure processor may then use a local control word to generate locally encrypted content specific to the device. The device may then receive the locally encrypted content from the secure processor and proceed to decrypt the locally encrypted content using a shared local encryption key. The Transport I/O system ensures the protection of the network control word by maintaining the network control word on the secure processor. | 09-18-2014 |
20140033297 | APPARATUS FOR CONTROLLING PROCESSOR EXECUTION IN A SECURE ENVIRONMENT - Various embodiments described herein relate to apparatus for executing software in a secure computing environment. A secure processor can be used and configured to request a context swap from a first context to a second context when switching execution from a first portion of software to a second portion of software. A context manager, which can be in communication with the secure processor, can be configured to receive and initiate a requested context swap. A trust vector verifier, which can be in communication with the secure processor and the context manager, can be configured to load a trust vector descriptor upon command from a context manager. | 01-30-2014 |
20120328099 | ANTI-SPLITTER VIOLATION CONDITIONAL KEY CHANGE - Systems and methods are disclosed for performing anti-piracy countermeasures in order to prevent unauthorized access of protected content. A conditional access system may be modified to include a counter. The counter is incremented every time the conditional access system receives a request that is a potential indication of pirate activity. The counter may also be decremented every time the conditional access system receives a request indicative of legitimate activity. If the conditional access system receives a management message containing a key required to access content keys, the conditional access system cheeks the counter. If the counter is below a threshold value, the conditional access system obtains the key. However, if the counter is above the threshold value, the conditional access system disregards the key contained in the management message, thereby losing access to protected content. | 12-27-2012 |
20120189121 | CASCADING DYNAMIC CRYPTO PERIODS - Systems and methods for performing cascading dynamic crypto periods are disclosed. In embodiments, a control word and a set of functions is transmitted between a head-end and recipient devices at the beginning of a crypto period. The crypto period is divided into a discrete number of sub-crypto periods. The control word used to encrypt and decrypt the broadcast content is changed during each sub-crypto period. At the end of the first sub-crypto period, a derived control word is generated by passing the original control word to a function in the set of functions in order to generate a derived control word at the first transition between sub-crypto periods. The derived control word is used for encryption and decryption of the broadcasted content during the second sub-crypto period. Upon transitioning to the third sub-control-period, the derived control word is input into another function to produce a second derived control word. | 07-26-2012 |