TP-Link TL-WR841HP User Manual page 146

It's the WPA/WPA2 authentication type based on pre-shared passphrase.

Version - you can choose the version of the WPA-PSK security on the drop-down list. The
default setting is Automatic, which can select WPA-PSK (Pre-shared key of WPA) or
WPA2-PSK (Pre-shared key of WPA) automatically based on the wireless station's
capability and request.

Encryption - When WPA-PSK or WPA is set as the Authentication Type, you can select
either Automatic, or TKIP or AES as Encryption.

Note:
If you check the WPA/WPA2-Personal
find a notice in red as shown below.

Wireless Password - You can enter ASCII or Hexadecimal characters. For Hexadecimal,
the length should be between 8 and 64 characters; for ASCII, the length should be between
8 and 63 characters.

Group Key Update Period - Specify the group key update interval in seconds. The value
can be either 0 or at least 30. Enter 0 to disable the update.
Click the Save button to save your settings on this page.

WEP
WEP is based on the IEEE 802.11 standard.
TL-WR841HP 300Mbps High Power Wireless N Router
radio button and choose TKIP encryption, you will
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