Security and usability issues with passwords suggest a need for a new authentication scheme. Several alternatives involve a physical device or token. We investigate one such alternative, Pico: an authentication scheme that utilizes multiple wearable devices. We present the grounded theory results of a series of semi-structured interviews for exploring perceptions of this scheme. We found that t...

Frank Stajano: My title should give you a hint about my position towards this problem. What’s a password? A password is a way to drive users crazy! Passwords were not so bad when you had only one or two of them, and when a password of eight or nine characters was considered a safe password. Nowadays computers have grown so powerful that ten character passwords can be bruteforced with the kind o...

A small vector magnetometer has been constructed for DTUsat – a Danish CubeSat student project at the Technical University of Denmark. The presented magnetometer is used for attitude determination in conjunction with sun sensors, and supply local field measurements for the magnetotorquer controller. Present launch date is June 30th, 2003 from Plesetsk, Russia. Constraints on mechanical size, ma...

The aim of this paper is to show that the computation of the discrete logarithm in the m-torsion part of the divisor class group of a curve X over a finite field ko (with char(/co) prime to m), or over a local field k with residue field /co , can be reduced to the computation of the discrete logarithm in /co(Cm)* • For this purpose we use a variant of the (tame) Täte pairing for Abelian varieti...

—This paper presents the design of a highly linear broadband power amplifier (PA) operating from 200MHz to 3GHz for Long Term Evolution (LTE) pico-cell base station. The monolithic microwave integrated circuit (MMIC) PA is realized with 0.25-μm Enhancement Mode Pseudomorphic High Electron Mobility Transistor (E-pHEMT) process. The broadband PA employs a novel dual feedback technique to achieve...