We have proposed Smart Sensor Networks (S-Nets) as an architecture and set of distributed algorithms to extract, interpret and exploit networked sensor devices. Heretofore, the development of this approach has been done in simulation. In this paper, we describe two complementary implementations of S-Nets: (1) on a set of Berkeley motes comprised of low-power 8-bit, 128Kb memory processors, comm...

-Digital watermarking is a technique of embedding pieces of information into digital data such as text, audio, video, and still images that can be detected or extracted later to show authentication about the data. Watermark is hidden information in the image(s) and is so designed that it does not degrade/distort the quality of the image and still keeps the information. Digital watermarking is b...

We design a systolic coprocessor for the addition of signed normalized rational numbers. This is the most complicated rational operation: it involves GCD, exact division, multiplication and addi-tion/subtraction. In particular, the implementation of GCD and exact division improve signiicantly (2 to 4 times) previously known solutions. In contrast to the traditional approach, all operations are ...

This paper describes some techniques for optimizing software implementations of E2 on various platforms. It is relatively easy to implement a byte-oriented cipher such as E2 on an 8-bit processor, but it is difficult to implement it efficiently on a 32-bit processor or a 64-bit processor. In particular, this paper shows some optimization techniques for SPN (Substitution-Permutation Network) on ...

Reversible logic has attracted substantial interest due to its low power consumption which is the main concern of low power VLSI circuit design. In this paper, a novel 4x4 reversible gate called inventive gate has been introduced and using this gate 1-bit, 2-bit, 8-bit, 32-bit and n-bit group-based reversible comparator have been constructed with low value of reversible parameters. The MOS tran...

US defense sponsored the DES program in 1971 and released it on 1977. It remained as a well-known and well-accepted defacto standard of block ciphers until 1998. Thirty-two 4-bit DES S-Boxes are grouped in eight each having four and are put in public domain without any mention of their design methodology. Due to this discovery of substitution Boxes, SBoxes, 4-bit, 8-bit or 32-bit, find a perman...