Presented by :
Ranjeet Kumar (Madurai kamaraj university)MCA 2nd year
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 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.
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.
A Java Ring is a finger ring that contains
small microprocessor with built-in capabilities for the user.
Java virtual machine
applets (little application programs)
Real Time Clock
The rings were built by Dallas Semiconductor.
A Small Microprocessor
Consist of 32k ROM
6K of RAM and can be extended upto 134k RAM
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
An iButton uses its stainless steel can : It is an electronic communicationsinterface. 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
Layout of iButton
Types of iButtonMemory iButton
Java Powered Cryptographic iButton
Internal detailsCryptographic iButton
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
Blue Dot ReceptorsSerial Port Adapter
Parallel Port Adapter
USB Port Adapter
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
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
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
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
Java ring is wearable
Completely controlled by the user
Can be highly successful in market in future
More durable because of its stainless steel armour
Can be attached to various personal accessories Conclusion