Netgear FWG114P v2 ユーザーズマニュアル

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Wireless Networking Basics

The IEEE 802.11 standard supports two types of WEP encryption: 40-bit and 128-bit.

The 64-bit WEP data encryption method allows for a five-character (40-bit) input. Additionally, 
24 factory-set bits are added to the forty-bit input to generate a 64-bit encryption key. The 24 
factory-set bits are not user-configurable). This encryption key will be used to encrypt/decrypt all 
data transmitted via the wireless interface. Some vendors refer to the 64-bit WEP data encryption 
as 40-bit WEP data encryption since the user-configurable portion of the encryption key is 40 bits 
wide.

The 128-bit WEP data encryption method consists of 104 user-configurable bits. Similar to the 
forty-bit WEP data encryption method, the remaining 24 bits are factory set and not user 
configurable. Some vendors allow passphrases to be entered instead of the cryptic hexadecimal 
characters to ease encryption key entry.

128-bit encryption is stronger than 40-bit encryption, but 128-bit encryption may not be available 
outside of the United States due to U.S. export regulations. 

When configured for 40-bit encryption, 802.11 products typically support up to four WEP Keys. 
Each 40-bit WEP Key is expressed as 5 sets of two hexadecimal digits (0-9 and A-F). For 
example, “12 34 56 78 90” is a 40-bit WEP Key.

When configured for 128-bit encryption, 802.11 products typically support four WEP Keys but 
some manufacturers support only one 128-bit key. The 128-bit WEP Key is expressed as 13 sets of 
two hexadecimal digits (0-9 and A-F). For example, “12 34 56 78 90 AB CD EF 12 34 56 78 90” 
is a 128-bit WEP Key.

Note: Typically, 802.11 access points can store up to four 128-bit WEP Keys but some 802.11 
client adapters can only store one. Therefore, make sure that your 802.11 access and client 
adapters’ configurations match.

64-bit (24+40)

10

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128-bit (24+104)

26

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