Public camera feeds are increasingly being opened to use by multiple authorities (e.g., police, fire, traffic) as well as to the public. Because of the difficulty and insecurity of sharing cryptographic keys, these data are available in the clear. However, authorities must have a mechanism to assure trust in the video, that is, to authenticate it. While lossless video is straightforward to authenticate by cryptographic means, lossy video as may result from UDP, wireless, or transcoded transmissions, is more difficult to authenticate. We describe a method that combines a concise and efficiently computed video fingerprint with public key cryptography. Essential components of our approach are: the procedure to combine inexact video fingerprint with exact digital signature to enable lossy authentication, and matching for misaligned video via a major incline approach. Experimental results relate video fingerprint length to authentication accuracy and latency (time to authentication).

Achieving the potential performance of highly parallel MIMD processor architectures is critically dependent on both the speed and routing capabilities of the network fabric. The routing network of the AT&T DSP3 processor is described together with an indication of how the 40 megabyte/s links can be configured to meet diverse application requirements. Scaling to very large configurations is aided by compact packaging. Silicon-on-silicon multi-chip modules together with a novel three-dimensional vertical interconnection technology are being used to repackage the DSP3 into the ultra-dense processor.>

Based on information-theoretic principles, fundamental guidelines for signal processing systems design are developed. Conventional systems figures-of-merit do not effectively consider these basic metrics. The issue in the design of real-time signal processing systems is efficiency rather than raw processing speed. The critical parameters to consider in designing a signal processing system are available power and communications resources. With these considerations in mind, a constant-capacity architecture is outlined.>

There are many interacting issues which must be investigated fully before a multiprocessor system for signal processing applications is integrated. Among the most important of these issues are the system architecture, system configuration, and the implementation technology. A methodology for the simulation of systems under which these issues can be examined independantly is presented and shown to be applicable to a variety of architectures. The methodology used is simple and can be a valuable system design tool. The usefulness of the approach is illustrated with an example.