08-08-2012, 03:22 PM
JAVA RING
java_ring.ppt (Size: 2 MB / Downloads: 46)
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."
WHAT IS JAVA RING ?
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.
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 JAVA RING
A Java Ring is a finger ring that contains
small microprocessor with built-in capabilities for the user.
a sort of smart card that is wearable on a finger.
stainless-steel iButton running a Java virtual machine and
preloaded with applets (little application programs).
The rings were built by Dallas Semiconductor.
Inside java ring…
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 the processor features a high-speed , large RAM and ROM memory capacity, and an unalterable real-time clock.
It is small and portable enough to attach to a key fob, ring, watch, or other personal items
iButton components
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.
Layout of iButton
Information is transferred between iButton and a PC with a momentary contact, at up to 142K bits per second.
To do that one presses iButton to the Blue Dot receptor, a $15 pipeline into PC. The Blue Dot sticks to any convenient spot on the front of a PC and is cabled to the serial or parallel port in the back.
Contd…
By simply touching the iButton to the two contacts described
above, you can communicate with it through our 1-Wire®
protocol.
The 1-Wire interface has two communication speeds: standard
mode at 16kbps, and overdrive mode at 142kbps
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.
JAVA CONNECTION
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.
Use of java ring:
Authentication is crucial to most applications, since billing
and privacy is based on it.
A very easy and convenient way for users.
It is more secure than using passwords, since passwords
are short or can be guessed.
It is easier for administrators to maintain the security
infrastructure, since only password can be forgotten.
A ring is a personal thing that the user and only the user
carries along anytime and anywhere, so that she can
authenticate herself in every situation.
It is also possible to use a tag on the key ring or a watch
instead of a ring.
ADVANTAGES
Java ring is wearable :
A wearable computer is a computer that is subsumed into the personal space of the user, controlled by the user, and has both operational and interactional constancy, i.e. is always on and always accessible.
CONCLUSION
. The Java iButton, therefore, is simply the latest and most complex descendant of a long line of products that have proven themselves to be highly successful in the marketplace. 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, keyfobs, wallets, bracelets, and necklaces, so the user can select a variation that suits his or her lifestyle.