摘要:
The present invention provides a method and apparatus for buffering in multi-node data distribution architectures. One embodiment of the present invention groups data items into frames and stores the frames in a buffer. One embodiment allocates storage space for the buffer such that enough storage is available to accommodate one frame for every client wishing access to the data in addition to a fixed number of frames. One embodiment stores the buffer as a linked list of frames. In one embodiment, the head of the linked list is the oldest frame in the buffer and the tail of the linked list is the newest frame. When a new frame of data is added to a full buffer, the oldest frame not in use is removed and the new frame is added. One embodiment, allows multiple clients to access a single frame in the buffer simultaneously. The clients indicate when they are using a frame in the buffer so that the frame is not overwritten. In one embodiment, a client locks a frame only when the frame is being dispatched to the client. In one embodiment, a client initially operates on the newest frame. When a client finishes with one frame, it selects the next frame in the buffer's linked list. One embodiment is used in a video conferencing application. Frames consist of video or audio data packets. One embodiment is used in a thin client topology. Clients lock frames to set destination specific parameters as the frame is dispatched.
摘要:
Physical Unclonable Functions (PUFs) for authentication can be implemented in a variety of electronic devices including FPGAs, RFIDs, and ASICs. In some implementations, challenge-response pairs corresponding to individual PUFs can be enrolled and used to determine authentication data, which may be managed in a database. Later when a target object with a PUF is intended to be authenticated a set (or subset) of challenges are applied to each PUF device to authenticate it and thus distinguish it from others. In some examples, authentication is achieved without requiring complex cryptography circuitry implemented on the device. Furthermore, an authentication station does not necessarily have to be in communication with an authority holding the authentication data when a particular device is to be authenticated.
摘要:
A message is signed using a PUF without having to exactly regenerate a cryptographic key. Another party that shares information about the PUF is able to verify the signature to a high degree of accuracy (i.e., high probability of rejection of a forged signature and a low probably of false rejection of a true signature). In some examples, the information shared by a recipient of a message signature includes a parametric model of operational characteristics of the PUF used to form the signature.
摘要:
Physical Unclonable Functions (PUFs) for authentication can be implemented in a variety of electronic devices including FPGAs, RFIDs, and ASICs. In some implementations, challenge-response pairs corresponding to individual PUFs can be enrolled and used to determine authentication data, which may be managed in a database. Later when a target object with a PUF is intended to be authenticated a set (or subset) of challenges are applied to each PUF device to authenticate it and thus distinguish it from others. In some examples, authentication is achieved without requiring complex cryptography circuitry implemented on the device. Furthermore, an authentication station does not necessarily have to be in communication with an authority holding the authentication data when a particular device is to be authenticated.
摘要:
A message is signed using a PUF without having to exactly regenerate a cryptographic key. Another party that shares information about the PUF is able to verify the signature to a high degree of accuracy (i.e., high probability of rejection of a forged signature and a low probably of false rejection of a true signature). In some examples, the information shared by a recipient of a message signature includes a parametric model of operational characteristics of the PUF used to form the signature.