With offline (non-distributed) testing, you can choose how the search is performed and what you're searching for.. You don't talk to the server at all and don't report what you find to anyone.
Key to start at:
Key range size (number of bytes to search through, with each byte being only 128 keys, rather than 256, due to every 8th bit of the key being a parity bit thanks to the NSA and their desire to be able to break DES sooner):
Enter values above, or choose a sample set of values that have quickly-findable keys:
Enable logging if you want extra log data visible (slows down the search and over a long period of time will bog down the browser).