The Java Ring is a smart ring containing a small Java-powered microprocessor. It functions similarly to a smart card, storing user information on its NVRAM chip and running applets. By touching the ring to a reader, users can access personalized services. Originally introduced in 1998, the Java Ring uses an iButton component for communication and identification, enabling contactless data transfer between the ring and computer. It provides convenient authentication but also has limitations around cost, compatibility, and storage.

1. JAVA RING
DONE BY
ARUN PRABHA K C
B.TECH(IT)

2. What is a Java Ring ?
• Is a finger ring that contains a small microprocessor
with built in capabilities for the user.
• Is a sort of a smartcard that is wearable on a finger.
• Is in fact a java smart card based on Java Virtual
Machine that was proposed as the Java card 2.0.

3. The Java Ring
• Contains a tiny Java Virtual Machine
• Implements the Java Card 2.0 API
• Stores information in NVRAM (6K)
• Runs applets
• Includes microprocessor, memory, clock and battery

4. Java Ring in its natural environment..

5. EVOLUTION
• The java ring, which is powered by Java card was
introduced at Sun Microsystems's JavaOne
Conference, in March 1998.
• It was developed by Dallas Semiconductor.
• Workstations at the conference had "ring readers"
installed on them that downloaded information about
the user from the conference registration system.
• This information was then used to enable a number of
personalized services.

6. Components
• Java Virtual Machine (JVM)
• RAM
• ROM
• real-time clock
• iButton
• Blue dot reciptor

7. iButton
• The iButton is a mechanical packaging
standard that places a 1-Wire component inside
a small stainless steel "button" similar to a
disk-shaped battery.
• Each iButton has a unique and unalterable
address laser etched onto its chip inside the
can.
• The address can be used as a key or identifier
for each iButton.

8. iButton Structure

9. Blue Dot Receptor…
• The Blue Dot Receptors are iButton reader/probes
that provide a convenient pipeline into the PC for
iButton-to-PC communication.
• The receptor's cable connects to a USB, serial, or
parallel-port 1-Wire adapter, whichever type of port
you wish to use.
• The receptor itself easily affixes to any accessible
spot on the front of the PC.

10. Working
• Whenever the user pushes his ring on a ring
reader(Blue Dot Receptor), the corresponding
application will take place.
• The jewel of the java ring is the iButton.
• iButton is a computer chip enclosed in a thick
stainless steel can.
• It uses 1-wire protocol for communication with the
host and the iButton.

11. Cont…
• 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.
• The Blue Dot receptor is cabled to a 1-Wire adapter
that is attached to a spare PC port. 1-Wire adapters
exist for USB, serial, and parallel ports. The Blue Dot
receptor and 1-Wire Adapter are inexpensive

12. Advantages…
• A very easy and convenient way for users.
• More secure than using passwords.
• Portable.
• Ruggedness.
• Wearable.

13. disAdvantages…
• Cost of implementation is high
• All machines should have appropriate iButton
• iButton has limited process power and memory

14. Conclusion…
• The java powered cryptographic iButton named
java ring that lie in its capacity to interact with
Internet applications to support strong remote
authentication and remotely authorized
financial transactions.
• The use of Java promotes compatibility with
these applications by providing a common
language for all application programming.

15. Applications
• Access Control
• Time and attendance
• eCash
• Thermochron Applications
• Gaming Systems