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Chapter 5 — Network Support

94 CK60 Mobile Computer with Windows CE User’s Manual

• Ad-hoc networks are private networks shared between two or more

clients, even with no access point.

Each wireless network is assigned a name (or Service Set Identifier - SSID)

to allow multiple networks to exist in the same area without infringement.

Intermec recommends using security measures with wireless networks to

prevent unauthorized access to your network and to ensure your privacy of

transmitted data. Authentication (cryptographically protected) by both the

network and the user, transmitted data, and encryption are required

elements for secure networks. Schemes are available to implement the

features.

Encryption

AES

(Advanced

Encryption

Standard)

A block cipher, a type of symmetric key cipher that uses groups of bits of a fixed length - called blocks.

A symmetric key cipher is a cipher using the same key for both encryption and decryption.

As implemented for wireless, this is also known as CCMP, which implements AES as TKIP and WEP

are implementations of RC4.

CKIP (Cisco

Key Integrity

Protocol)

This is Cisco's version of the TKIP protocol, compatible with Cisco Aironet products.

TKIP (Temporal

Key Integrity

Protocol)

This protocol is part of the IEEE 802.11i encryption standard for wireless LANs, which provides per-

packet key mixing, a message integrity check and a re-keying mechanism, thus overcoming most of

the weak points of WEP. This encryption is more difficult to crack than the standard WEP. Weak

points of WEP include: No Initiation Vector (IV) reuse protection, weak keys, no protection against

message replay, no detection of message tampering, and no key updates.

WEP (Wired

Equivalent

Privacy)

encryption

With preconfigured WEP, both the client CK60 and access point are assigned the same key, which

can encrypt all data between the two devices. WEP keys also authenticate the CK60 to the access

point - unless the CK60 can prove it knows the WEP key, it is not allowed onto the network. WEP

keys are only needed if they are expected by your clients. There are two types available: 64-bit (5-

character strings, 12345) (default) and 128-bit (13-character strings, 1234567890123). Enter these as

either ASCII (12345) or Hex (0x3132333435).

Key Management Protocols

WPA (Wi-Fi

Protected Access)

This is an enhanced version of WEP that does not rely on a static, shared key. It encompasses a

number of security enhancements over WEP, including improved data encryption via TKIP and

802.11b/g authentication with EAP. WiFi Alliance security standard is designed to work with existing

802.11 products and to offer forward compatibility with 802.11i.

WPA2 (Wi-Fi

Protected Access)

Second generation of WPA security. Like WPA, WPA2 provides enterprise and home Wi-Fi users

with a high level of assurance that their data remains protected and that only authorized users can

access their wireless networks. WPA2 is based on the final IEEE 802.11i amendment to the 802.11

standard ratified in June 2004. WPA2 uses the Advanced Encryption Standard (AES) for data

encryption and is eligible for FIPS (Federal Information Processing Standards) 140-2 compliance.

Authentication

EAP (Extensible

Authentication

Protocol)

802.11b/g uses this protocol to perform authentication. This is not necessarily an authentication

mechanism, but is a common framework for transporting actual authentication protocols. Intermec

provides a number of EAP protocols for you to choose the best for your network.

EAP-FAST

(Flexible

Authentication

via Secure

Tunneling)

A publicly accessible IEEE 802.1X EAP type developed by Cisco Systems. It is available as an IETF

informational draft. An 802.1X EAP type that does not require digital certificates, supports a variety

of user and password database types, supports password expiration and change, and is flexible, easy to

deploy, and easy to manage.

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