Dynamic Pre-Shared Key (PSK) is a patented technology developed to provide robust and secure wireless access while eliminating the arduous task of manual configuration of end devices and the tedious management of encryption keys.

Dynamic PSK creates a unique 63-byte encryption key for each user upon accessing the wireless LAN for the first time and then automatically configures end devices with the requisite wireless settings (i.e., SSID and unique pass phrase) without any manual intervention.

Wireless Security Choice for Enterprises

Wireless security remains a primary concern for enterprises when deploying a WLAN. But securing a WLAN is complex and time consuming. This is a major problem for enterprises with limited IT staff that don’t have the time or expertise to implement robust wireless security. Authentication (i.e., who is the user and what is the device) and encryption (the scrambling of data) are the two primary security issues to be addressed.

Three popular security options available tradeoff security and ease of deployment (see Table 1). But none of these options provides an optimal solution.

While simple to implement, an open wireless network is clearly not a secure solution as it leaves user transmissions in the clear inviting would-be snoopers to easily grab data out of the air or penetrate the internal network.

A more commonly used wireless security option is the common pre-shared encryption key. A key or pass phrase is configured on the APs and on every laptop.

While this option is perceived to be more secure, it’s not. Using the same PSK for all employees means that key can be easily compromised. The common PSK also tends to be a relatively short string that can be easily compromised. And for every new employee, IT staff must confi gure the laptop with the SSID and the key. If there’s a need to replace the key (e.g., employee leaves), every laptop must be reconfigured.

The third option uses an enterprise-class solution such as 802.1X. Through a highly secure solution, 802.1X is very complex to set up. It requires having the right infrastructure starting with the RADIUS server all the way to 802.1X supplicants on each and every client. Configuring and maintaining 802.1X is time consuming for enterprises that do not have the resources to manage such an endeavor.

A new approach, Dynamic PSK solves these problems.

How does Dynamic PSK work?

Instead of manually configuring each individual laptop with an encryption key and the requisite wireless SSID, Dynamic PSK automates and centralizes this process. Once enabled for the entire system, a new user simply connects to the Ethernet LAN and authenticates via a captive portal hosted on the Ruckus ZoneDirector. Mobile devices like the Apple® iPhone® can also be authenticated through a captive portal over wireless. This information is checked against any standard back-end authentication (AAA) server
such as Active Directory, RADIUS, LDAP or an internal user database on the ZoneDirector.

Upon successful authentication, the ZoneDirector generates a unique encryption key for each user. The lifetime of the key can be confi gured to align with company policies. A temporary applet with the unique user key and other wireless confi guration information is then pushed to the client. This applet automatically confi gures the user’s device without any human intervention.

The user then detaches from the LAN and connects to the wireless network. Once associated, the Dynamic PSK is bound to the specifi c user and the end device being used.


  • Automatic provisioning of unique encryption key to each user/device
  • No manual client configuration
  • Unique 63-byte key per user per device
  • Easily deactivated when employee leaves
  • New key can be generated periodically
  • Configurable per WLAN


  • Robust security simplified
  • Highly secure
  • “IT Lite” — simple to deploy and maintain
  • No expensive AAA or RADIUS servers needed
  • Secures handheld devices

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