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Presented by :
Ranjeet Kumar
(Madurai kamaraj university)
MCA 2nd year

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JAVA RINGS..

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HISTORICAL
BACKGROUND
JAVA RING—WHAT IS IT??
INSIDE JAVA RING
JAVA CONNECTION
USE OF JAVA RING
ADVANTAGES
CONCLUSION

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 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."

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 One of the first impressive devices powered by the Java Card
technology came in the form of now famous Java Rings at the Sun's
JavaOne conference, in March 1998.
 The JavaRing is a tiny wearable computer with 6 kilobytes of RAM.
 Six K 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.

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 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 his/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.

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A Java Ring is a finger ring that contains 
 small microprocessor with built-in capabilities for the user.
 stainless-steel iButton
 Java virtual machine
 applets (little application programs)
 Real Time Clock
The rings were built by Dallas Semiconductor.

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A Small Microprocessor
 Consist of 32k ROM
 6K of RAM and can be extended upto 134k RAM

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The jewel of the Java Ring is the Java iButton –
 The iButton is a computer chip enclosed in a 16mm thick stainless
steel can. Because of this unique and durable container, up-to-date
information can travel with a person or object anywhere they go.
 Designed to be fully compatible with the Java Card 2.0 standard.
 It is small and portable enough to attach to a key fob, ring, watch,
or other personal items
JAVA Powered iButton

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An iButton uses its stainless steel
 can :
It is an electronic communications
interface. Each can has a data contact,
called the 'lid', and a ground contact,
called the 'base'. Each of these contacts
is connected to the silicon chip inside.
 Grommet :
The two contacts are separated by a polypropylene
grommet.
iButton Components

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Layout of iButton

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Types of iButton
 Memory iButton
 Java Powered Cryptographic iButton
 Thermochron iButton

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Internal details
Cryptographic iButton

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 Information is transferred between iButton and a PC
through Blue Dot Receptor
You simply touch iButton to a Blue Dot Receptor
These receptors uses 1-wire communication protocol
for data transfer
Blue Dot Receptor

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Blue Dot Receptors
 Serial Port Adapter
 Parallel Port Adapter
 USB Port Adapter

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1-Wire Communication Protocol
 Reset synchronizes the entire bus
 ‘Select’ a slave device is selected for communication
 Once a specific device is selected all other devices are ignored

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JVM
 It supports Java card 2.0 specification
 It allows the Java Ring to navigate through Java
Operating environment
 Provides Automatic garbage Collection for efficient
reuse of memory space

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 With experience designing the E-Commerce operating
system and VM for the Crypto iButton hardware platform.
 With a Java iButton, a vast number of existing Java
programmers could easily learn to write applets that could
be compiled with the standard tools available from Sun
Microsystems, loaded into the Java iButton, and run on
demand to support a wide variety of financial
applications.
 The Java Card 2.0 specification provided the opportunity
to implement a useful version of the JVM and runtime
environment with the limited resources available to a
small processor.
Java Connection

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 Access control to buildings and equipment
 Secure network login using challenge/response
authentication
 Storage vault for user names and passwords
 User profile for rapid Internet form-filling
 Digital signatures for e-commerce
 United States Postal Service Postal Security Device for
PC Postage downloadable over the Internet
 Digital photo ID and fingerprint biometrics
 Thermochron applications
Uses / Applications of Java Ring

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 Java ring is wearable
 Completely controlled by the user
 Rapid Zeroization
 Personalization
Advantages

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 Latest Technology
 Can be highly successful in market in future
 More durable because of its stainless steel armour
 Can be attached to various personal accessories
Conclusion