SRI International

About: SRI International is a nonprofit organization based out in Menlo Park, California, United States. It is known for research contribution in the topics: Ionosphere & Laser. The organization has 7222 authors who have published 13102 publications receiving 660724 citations. The organization is also known as: Stanford Research Institute & SRI.

Strongly unforgeable signatures based on computational diffie-hellman

Abstract: A signature system is said to be strongly unforgeable if the signature is existentially unforgeable and, given signatures on some message m, the adversary cannot produce a new signature on m. Strongly unforgeable signatures are used for constructing chosen-ciphertext secure systems and group signatures. Current efficient constructions in the standard model (i.e. without random oracles) depend on relatively strong assumptions such as Strong-RSA or Strong-Diffie-Hellman. We construct an efficient strongly unforgeable signature system based on the standard Computational Diffie-Hellman problem in bilinear groups.

Handhelds go to school: lessons learned

Abstract: Working in conjunction with teachers, researchers have developed a series of projects exploring the potential for using wireless handheld devices to enhance K-12 classroom instruction

Electrostrictive polymer artificial muscle actuators

Abstract: Many new robotic and teleoperated applications require a high degree of mobility or dexterity that is difficult to achieve with current actuator technology. Natural muscle is an actuator that has many features, including high energy density, fast speed of response, and large stroke, that are desirable for such applications. The electrostriction of polymer dielectrics with compliant electrodes can be used in electrically controllable, muscle-like actuators. These electrostrictive polymer artificial muscle (EPAM) actuators can produce strains of up to 30% and pressures of up to 1.9 MPa. The measured specific energy achieved with polyurethane and silicone polymers exceeds that of electromagnetic, electrostatic, piezoelectric, and magnetostrictive actuators. A simple model using linear elastic theory can predict EPAM actuator performance from mechanical and electrical material properties and load conditions. A spherical joint for a highly articulated (snake-like) manipulator using EPAM actuator elements has been demonstrated. A rotary motor using EPAM actuator elements has been shown to produce a specific torque of 19 mNm/g and a specific power of 0.1 W/g. An improved EPAM motor could produce greater specific power and specific torque than could electric motors.