Abstract: Pseudorandom numbers may be generated from input seeds using expander graphs. Expander graphs are a collection of vertices that are interconnected via edges. Generally, a walk around an expander graph is determined responsive to an input seed, and a pseudorandom number is produced based on vertex names. Specifically, a next edge, which is one of multiple edges emanating from a current vertex, is selected responsive to an extracted seed chunk. The next edge is traversed to reach a next vertex. The name of the next vertex is ascertained and used as a portion of the pseudorandom number being produced by the walk around the expander graph.

Abstract: Provided are apparatuses and methods in a mobile communication and content capturing device for controlling ownership and use of captured content. A mobile device capturing content of a user of a target device may automatically request authorization to use and own the captured content from the target device and user. The mobile device may detect the target device by comparing metadata associated with the captured content with device information of a target device. Alternatively, the capture device may communicate with a server to facilitate the authorization request process. The capture device may further establish a piconet with one or more intermediate wireless devices to detect and request authorization from a target device outside of the capture device's wireless range. Tokens may further be implemented to reduce transmission and processing times of various communication information including authorization requests and content files.