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The wireless/radio symbol on the RFID model is slightly larger than
 on the NEO, and has two radiating lines (instead of three).

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# Wikipedia:

In 2010, Yubico began offering the YubiKey OATH and YubiKey RFID models. The
YubiKey OATH added the ability to generate 6- and 8-character one-time
passwords using protocols from the Initiative for Open Authentication (OATH),
in addition to the 32-character passwords used by Yubico's own OTP
authentication scheme. The YubiKey RFID model included the OATH capability plus
also included a MIFARE Classic 1k radio-frequency identification chip,[22]
though that was a separate device within the package that could not be
configured with the normal Yubico software over a USB connection.

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# 2011 Wayback machine: 

# https://web.archive.org/web/20110829223639/https://store.yubico.com//store/catalog/product_info.php?products_id=17

RFID YubiKey    $35.00

Works with third party access control systems, using the MIFARE Classic 1k RFID chipset.

Firmware version 2.2+. Includes support for Yubico One Time Passcode (OTP), static passwords, OATH-HOTP and challenge-response.

Has the capability for 2 identities ("Slots") when programmed with the Personalisation tool.
This YubiKey comes with a lifetime subscription for the YubiCloud validation service, pre-configured in identity slot 1 and slot 2 blank. The free personalisation tool (for Windows, Mac OS X and GNU/Linux) allows re-configuration for other schemes.

Warranty 2 years.

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# iDivine Tech product page
# http://www.idivinetech.com/yubikeyproducttwo.php
# As of 2021-11-04

The key to the digital and physical world

The RFID YubiKey works like a normal YubiKey with added contactless
identification (RFID) functionality. This makes it ideal for organizations who
want a single identification key for the range of applications, including
access control and public transportation ticket systems. The RFID YubiKey
currently supports the commonly used MIFARE Classic (1k) standard.

Physical access control

Works directly with existing access control systems as a complement to existing
RFID cards and tokens. The RFID YubiKey is programmed just like any other RFID
card or token using standard RFID readers.

NFC

The RFID YubiKey can be used together with Near Field Communication (NFC)
phones and products. Application support is typically needed in the NFC device
and the RFID YubiKey needs to be configured to work with this particular
application setting.

RFID readers

Yubico does not provide RFID readers or software to configure MIFARE chips. A
wide range of RFID readers and systems, both for USB connection and for fixed
installation in access control settings are available. Just make sure the
reader supports the MIFARE Classic (1k) chip.

Reading range

Given the smaller tag size of the YubiKey compared with a standard ISO card,
the reading range is typically shorter. The reading range depends on the reader
antenna geometry but is typically 2-5 cm.

Security

The RFID chip is completely separate from the YubiKey authentication device and
cannot be accessed via the YubiKey USB interface and vice versa.

MIFARE Classic security

It can be argued that the MIFARE Classic crypto is weak. However, given the
widespread deployment of MIFARE Classic infrastructure and that the security is
more than good enough for most access control applications. Yubico has decided
to support this standard.

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# Wayback Machine 2009-11-30
# https://web.archive.org/web/20100102010958/http://yubico.com/news/091130/

Yubico today launches a YubiKey including contactless identification for access
to both the physical and digital world

The first beta series based on the most commonly used RFID standard MIFARE
Classic has been manufactured and is successfully verified by customers. The
Yubikey RFID looks exactly like an ordinary Yubikey 2.0 and offers a reading
distance of about 3 centimeters. During the first quarter 2010, the RFID
YubiKey will be available for order in any volume and will eventually support
MIFARE Plus and other more secure RFID standards.

The RFID YubiKey is ideal for organizations who want a single identification
key for the range of applications:

Networks and services

One touch secure login, works on all computers and platforms with no clients
software needed. Server software available as open source or from Yubico
solution partners.

Physical access control

Fits directly with existing access control systems as a complement to existing
RFID cards and tokens.

NFC mobile phones

Can be used with the range of NFC phones and applications, including remote
administration of keys.

Public transportation

A strong alternative to the RFID cards used for access to subways and trains as
the user can use the same device to securely purchase tickets online.

For more information, please describe your organization and project in an email
to Yubico access control expert jakob@yubico.com.

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