1. JAVA RING
Kaushik Banerjee
MCA Final year
(6th SEM)
1303214028

2. Contents :-
 Introduction
 History
 Components in java ring
 Working
 Comparison with smart cards
 Applications
 Conclusion
 reference

3. INTRODUCTION
 A Java Ring is a finger ring that contains a small microprocessor with built-in capabilities for the user.
 It contains an inexpensive microprocessor in a stainless steel ibutton running a JVM and it is preloaded
with applet.
 The Java Ring is an extremely secure Java-powered electronic token .
 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 ring has 134 KB of RAM, 32 KB of ROM, a real-time clock and a Java virtual machine, which is a
piece of software that recognizes the Java language and translates it for the user's computer

4. JAVA RING
Contains a tiny java virtual machine.
Implements the Java Card 2.0 API.
Store information in Lithium Backed NVRAM(6k)
offers high Read/Write speed.
Runs Applets.
Include microprocessor , Memory , Clock and Battery.
It is an extremely secure java-powered electronic token
with a continuously running, unalterable real time clock
and rugged packaging , suitable for many application.
The Ring has 132 KB of RAM,32 KB of ROM.

5. History
 In the summer of 1989, Dallas Semiconductor Corp. produced the first
stainless-steel-encapsulated memory device called iButton.
 IButton is the main component of java ring.
 Java Ring was introduced at their Java One Conference in March 1998.
 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”.

6. Components In Java Ring
JVM
RAM
ROM
Real time clock
Ibutton
Button Dot Receptor
One wire interface

7. Architecture of iButton

8. Blue Dot Receptor
Information is transferred between iButton and a PC
through Blue Dot Receptor.
You simply touch iButton to a Blue Dot receptor.
These receptor uses 1-wire communication protocol for
data transfer.
Has speed up to 142 kbps.
Read/Write operation done by RS232C serial port.
Information is transferred through the momentary
contact.

9. Working
 Java ring is programmed with the applets according to our application.
 For specific class of user specific java applets is preloaded in to the java ring.
 All the information of the user is stored in the java ring.
 User simply presses the signet of the java ring against the “blue dot” receptor and the system
connected to the receptor performs the function that the applet instructs to do.
 Information is transferred between your iButton and a PC with a momentary contact at up to
142kbps.
 You simply touch your iButton to a Blue Dot receptor or other iButton probe, which is
connected to a PC.

10.  iButtons have an advantage over conventional smart cards in term of durability and longevity.
 iButtons are rugged enough to withstand harsh environments.
 iButton uses java as a common programming language.
Comparison with smart card

11. Applications
 E-bank application.
 Providing security in your car.
 Login into your pc.
 Storage vault for user names and
passwords.
 E-cash transactions(like in Istanbul).
 Used by the students at celebration
School ,Orlando for lunch.
 Digital photo-id and fingerprint
biometrics.

12. Conclusion
Highly durable.
Java ring is highly durable because of its rugged and secure stainless packing. It is used in
personal computing.
With its stainless steel armor, it offers the most durable packaging for a class of products
that likely will suffer heavy use and abuse as personal possessions.
The iButton form factor permits attachment to a wide variety of personal accessories that
includes rings, watchbands, key fobs, wallets, bracelets, and necklaces, so the user can select
a variation that suits his or her lifestyle.
In near future , it will be widely used.

13. References
 Digital Jewellery : An approach to protect jewellery
- by Mohit Popat, Prof P.A.Bhalge.
 Dallas semiconductor ibutton website http://www.ibutton .com
 http://people.cs.uchicago.edu