Hawking Technology HWPS1UG - Manual (Page 123)

WEP key will determine the amount of encryption used in your
data transmission. The longer your key is, the more processing
power is used which will affect your data transmission speeds.
Key Format: You may select ASCII Characters (alphanumeric
format) or Hexadecimal Digits (in the "A-F " , " a-f" and "0-9"
range) to be used as your WEP Key.
Key 1 – Key 4: The WEP keys are used to encrypt data
transmitted through your wireless network. Fill in the data key
text box by following the rules below.
64-bit WEP: input 10-digit Hex values (in the "A-F", "a-f" and
"0-9" range) or 5-digit ASCII characters as the encryption keys.
128-bit WEP: input 26-digit Hex values (in the "A-F", "a-f"
and "0-9" range) or 10-digit ASCII characters as the encryption
keys.
Default Key: Select one of four keys to encrypt your data. You
may change the default values of the predefined keys. Only the
key you select as the “Default key” will be used.