Encoding Netscaler Persistent Cookies From Being Decoded
From release 10.5 build 55.8, you can encrypt the cookie in addition to any SSL encryption.
To encrypt the cookie by using the command line interface, at the command prompt, type:
set lb parameter -useSecuredPersistenceCookie ENABLED -cookiePassphrase test
To encrypt the cookie by using the configuration utility, navigate to Traffic Management > Change Load Balancing Parameters, and select Use Secured Persistence Cookie and Cookie Passphrase and enter a passphrase