Asus RT-N15U - Manual (Page 37)

7 Chapter 5: Installing the utilities RT-N15U
4. Key in desired network name or SSID (service set identifier). When done, click
Next.
5. Create and key in a passphrase consisting of 8-6 characters or use the
automatically generated passphrase then click Next.
A passphrase is a sentence, phrase, or sequence of alpha-numeric characters
used to generate a security key.