Bedienungsanleitung Intermec CN3 (Seite 197 von 212) (Englisch)

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Chapter 5 — Network Support

CN3 Mobile Computer User’s Manual 183

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 CN3 and access point are assigned the same

key, which can encrypt all data between the two devices. WEP keys also authenticate the

CN3 to the access point - unless the CN3 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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