A Java Ring is a finger ring that contains a small microprocessor with built-in
capabilities for the user, a sort of smart card that is wearable on a finger.
Sun Microsystem's Java Ring was introduced at their JavaOne Conference in 1998
and, instead of a gemstone, contained an inexpensive microprocessor in a stainless-steel
iButton running a Java virtual machine and preloaded with applets (little application
programs). The rings were built 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. For
example, a robotic machine made coffee according to user preferences, which it
downloaded when they snapped the ring into another "ring reader."
Although Java Rings aren't widely used yet, such rings or similar devices could
have a number of real-world applications, such as starting your car and having
all your vehicle's components (such as the seat, mirrors, and radio selections)
automatically adjust to your preferences.
The Java Ring is an extremely secure Java-powered electronic token with a continuously
running, unalterable real-time clock and rugged packaging, suitable for many applications.
The jewel of the Java Ring is the Java iButton -- a one-million transistor, single
chip trusted microcomputer with a powerful Java Virtual Machine (JVM) housed in
a rugged and secure stainless-steel case. 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 system.
The Ring, first introduced at JavaOne Conference, has been tested at Celebration
School, an innovative K-12 school just outside Orlando, FL. The rings given to
students are programmed with Java applets that communicate with host applications
on networked systems. Applets are small applications that are designed to be run
within another application. The Java Ring is snapped into a reader, called a Blue
Dot receptor, to allow communication between a host system and the Java Ring.
Designed to be fully compatible with the
Java Card 2.0 standard the processor features a high-speed 1024-bit modular exponentiator
fro RSA encryption, large RAM and ROM memory capacity, and an unalterable real
time clock. The packaged module has only a single electric contact and a ground
return, conforming to the specifications of the Dallas Semiconductor 1-Wire bus.
Lithium-backed non-volatile SRAM offers high read/write speed and unparallel tamper
resistance through near-instantaneous clearing of all memory when tampering is
detected, a feature known as rapid zeroization. Data integrity and clock function
are maintained for more than 10 years. The 16-millimeter diameter stainless steel
enclosure accomodates the larger chip sizes needed for up to 128 kilobytes of
high-speed nonvolatile static RAM. The small and extremely rugged packaging of
the module allows it to attach to the accessory of your choice to match individual
lifestyles, such as key fob, wallet, watch, necklace, bracelet, or finger ring!!!!!
A Java Ring--and any related device that
houses an iButton with a Java Virtual Machine--goes beyond a traditional smart
card by providing real memory, more power, and a capacity for dynamic programming.
On top of these features, the ring provides a rugged environment, wear-tested
for 10-year durability.
You can drop it on the floor, step on it, forget to take
it off while swimming and the data remains safe inside. Today iButtons are primarily
used for authentication and auditing types of applications. Since they can store
data, have a clock for time-stamping, and support for encryption and authentication,
they are ideal for audit trails.
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