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Chapter 18: Wireless Local-Area Networking
Encryption for Data Transmission
189
Psion Mobile Devices Developers Guide
Devicescape Agent
Certificates are specified in one of the following:
ROOT of the device.
USER store on the device.
The certificate hash code has to be specified by character when configuring it: For coding details see the
WLANEx_Connect demo on Ingenuity Working at:
community.psion.com/downloads/developer_sdkhdk/m/sample__demo_code/1176.aspx
18.6 Encryption for Data Transmission
18.6.1 Wired Equivalent Privacy (WEP) Keys
Wired equivalent privacy (WEP) is an encryption algorithm and part of the 802.11 standard. It is a security
measure to protect wireless LANs from casual eavesdropping. WEP uses a shared secret key to encrypt
packets before transmission between wireless LAN devices, and it monitors packets in transit to detect
attempts at modification.
WEP key length
The length of the WEP key determines the size of the encryption key:
A 5-character text string, or a 10-character hexadecimal string, gives a 40-bit encryption key.
A 10-character text string, or a 26-character hexadecimal string, gives a 128-bit encryption key.
WEP key index
The Mobile Devices SDK can store up to four WEP keys. The index is used to identify each key (1 to 4) when
determining which key to use.
18.6.2 Encryption Modes
Encryption modes are available through the Mobile Devices SDK as follows:
EAP Mode Can take...
TLAS User certificate or CA certificate.
LEAP Username and password only.
Fast Username and password with a special pacfilename and pacpassword.
PEAP-GTC Username and password, and a CA certificate.
PEAP_MSCHAP Username and password, and a CA certificate.
Mode DSA Summit WZC
WEP Yes Yes Yes
WEP auto Yes
TKIP Yes Yes Yes
TKIP-CCMP Yes
AES Ye s Yes
CKIP Yes
CCMP Yes
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