The Cisco ASA 5505 adaptive security appliance comes with a DES license that provides encryption. You can obtain a 3DES-AES license that provides encryption technology to enable specific features, such as secure remote management (SSH, ASDM, and so on), site-to-site VPN, and remote access VPN. You need an encryption license key to enable this license.
If you are a registered user of Cisco.com and would like to obtain a 3DES/AES encryption license, go to the following website:
Updates the encryption activation key by replacing the activation-4-tuple-key variable with the activation key obtained with your new license. The activation-5-tuple-key variable is a five-element hexadecimal string with one space between each element. An example is 0xe02888da 0x4ba7bed6 0xf1c123ae 0xffd8624e. The "0x" is optional; all values are assumed to be hexadecimal.
Step 4
hostname(config)# exit
Exits global configuration mode.
Step 5
hostname# copy
running-config
startup-config
Saves the configuration.
Step 6
hostname# reload
Reboots the adaptive security appliance and reloads the configuration.