D-Link DW-590 User Manual page 40

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Unique Key: This field defines the unique encryption key for security
for the current network configuration. In ad hoc mode, this encryption
key type is not used. To enable security using a Unique Key, this field
must be populated.
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Shared Keys: These fields define a set of shared encryption keys.
To enable security using Shared Keys, at least one Shared Key field
must be populated.
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Key Length: This field defines the length for each encryption key.
As the Key Length is changed, the number of available characters in
the field is changed automatically. If after a key is entered the length
is adjusted to a smaller number, the key is automatically truncated to
fit. If the length is increased again, the field is not automatically
updated to its previous value.
All encryption key fields are displayed only when initially entered. On
subsequent entry into the security property page, the fields are masked.
The keys must be entered as hexadecimal digits.
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