Seminar on java ring

Answer 1

JAVA RING

JAVA RINGS..

OUTLINE

HISTORICAL BACKGROUND

In the summer of 1989, Dallas Semiconductor Corp.

produced the first stainless-steel-encapsulated memory

devices utilizing the Dallas Semiconductor 1-Wire

communication protocol.

By 1990, this protocol had been refined and employed

in a variety of self-contained memory devices.

Originally called "touch memory" devices, they were

later renamed iButtons

One of the first impressive devices powered by the Java Card

technology came in the formÃ'Â of now famous Java Rings at the

Ã'Â Sun's JavaOne conference, in March 1998.

WHAT IS JAVA RING ??

The Java Ring is a stainless-steel ring, 16-millimeters (0.6 inches) in diameter that houses a 1-million-transistor processor, called an iButton

The Java Ring is a tiny wearable computer with 134kilobytes of RAM.

RAM has 6KB of data memory and to 32KB 0f program memory

6KB may not sound like much, but it is 20 percent more memory

than the first computer ever used .

Even 6 K is enough to hold your secret codes, your credit cards

numbers, your driver license, other wallet contents, and even some electronic cash. The ring can also store a few important URLs.

CONTD..

The Java Ring is a wearable computer that can be used to

authenticate users to services on the internet. A user only has to

push the ring on her finger on a Java Ring reader for about a

second.

The key issue about a wearable computer is not whether it is a ring

or another form factor: the deciding point is that we will always

have it with us. Many aspects of computing change once there

is no need to go to a special room to get at the computer.

INSIDE JAVARING

JAVA VIRTUAL MACHINE

134KB RAM

32KB ROM

REAL TIME CLOCK

IBUTTON

BLUE DOT RECEPTOR

CONTD..

JAVA VIRTUAL MACHINE

JVM is the piece of software that recognises java language and translate the byte code, which is used by system connected to java ring via reader.

134KB of RAM

* It is used to store program and data.

* The NVRAM offers high R/W speed and also provides temper resistance through instantaneous clearing of all memory when tempering is detected. This process called as Rapid Zeroization.

* Energy provided by lithium backup preserves complete state of machine when java ring is disconnected from user.

CONTD..

* Performs garbage collection to deal with the objects which are out of scope and recycle memory.

* Applets can be loaded or unloaded from java iButton

32KB of ROM

* Special kind of operating system called E-commerce based on java and JVM is stored in the ROM. This is because it is not supposed to be altered by the user.

* Operating system handles all operations happening in iButton.

REAL TIME CLOCK

* It gives exact time of the day. It can run upto 10 years by energy provided by lithium backup.

* Processor clock frequency is not constant and cannot be determined by external means.