Being the Nonce, the Response & the algoritm is known, the only unknown is the secret. So one can start guessing which secret it is. Today a password between 1 and 6 characters can be cracked on a normal PC in about an hour. To make matters worse, over Amazon EC2, it is claimed a password of 10 characters can be cracked for less then $100. There are even online services offering this, e.g. Cloudcracker
Crack Ozeki VoIP SIP SDK 9 2 0 13
2ff7e9595c
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