Cisco does not provide a standalone "activation key generator" for public use. Instead,
Keys are only valid for the specific hardware platform they were generated for. Product Authorization Key (PAK): cisco asa activation key generator
To get a valid activation key, follow these steps through the Cisco Software Central or official licensing channels: Obtain Serial Number: show version Cisco does not provide a standalone "activation key
command on your ASA to find the serial number used for licensing (note: this may differ from the chassis serial number). Use the License Portal: Log in to the Cisco License Registration portal and enter your PAK and device serial number. Activate via CLI: Once received via email, apply the key using the command: activation-key Special Licenses: Certain features, such as Strong Encryption (3DES/AES) Use the License Portal: Log in to the
Managing Licenses with Activation Keys > Cisco ASA Licensing 22 Jul 2014 —