Trellisware Technologies, Inc.

Northrop Grumman Systems Corporation

Peter Ly

Mark Johnson

Daniel Haas

Methods and systems for improving authenticated encryption in counter-based cipher systems are presented. Embodiments of the present invention provide secure and efficient means to achieve both the authenticity and privacy goals of authenticated encryption, and are compatible with most block cipher modes of operation, e.g. CBC, CFB and CTR, and most symmetric-key cryptographic functions, e.g. AES, DES and RC5. In particular, using block cipher encryption with data-dependent initialization vectors achieve the privacy goal and enable over-the-air transmissions to remain uncompromised, especially in scenarios that may result in the counter being reset in counter-based cipher systems.

Methods and systems for improved authenticated encryption in counter-based cipher systems

Methods and systems for improving communication in a multi-hop, time-slotted wireless network are presented. Embodiments of the present invention are able re-use timeslots to locally transmit information to one-hop nodes, thereby utilizing the bandwidth more efficiently. Other embodiments are able to evaluate the trade-off between power consumption and communication reliability, and are consequently able to provide increasing degrees of robustness for broadcasts in the wireless network. That is, these latter embodiments are able to incrementally use re-transmissions, therein trading-off battery life for an increased message completion rate or a lower packet error rate, for example, in order to reliably broadcast critical or high-priority message network-wide.

Methods and systems for improved communication in multi-hop networks

A system and method for pre-distorting a digital signal in a digital communications system. The method includes converting digital bits to be transmitted to a series of symbols defining the bits and providing the symbols to a pulse shaping filter (PSF) that provides samples of the symbols at a predetermined sample rate. The method also includes providing the filtered samples to a pre-distorter that pre-distorts the samples, wherein pre-distorting the samples includes providing a non-linear transformation of the samples that is defined by pre-distorter taps, and providing the pre-distorted samples to a power amplifier to be transmitted, where pre-distorting the samples includes modeling the power amplifier and associated transmitter components using a degree three memory polynomial.

Growing community of inventors

Escondido, CA, United States of America

Peter Ly