Network authentication
How to identify and crack an SIP digest authentication hash
Identify an SIP digest authentication hash and crack it with ready-to-run hashcat and John the Ripper commands. Fast on a GPU.
SIP digest authentication is an network authentication hash type. It is fast and typically unsalted, which makes weak passwords recoverable quickly on consumer GPU hardware. This page shows how to recognise it and the exact commands to attack it.
All identification runs locally in WebAssembly. The commands below write the hash to a local file on your machine — nothing is sent to this site.
Identifying the hash
The hash identifier on the home page detects SIP digest authentication entirely in your browser — your hash is never uploaded. A typical example looks like this:
$sip$*72087*1215344588*...
Cracking SIP digest authentication with hashcat
Save the hash to a file and run hashcat in mode -m 11400. Start with a wordlist such as rockyou.txt:
echo '$sip$*72087*1215344588*...' > hash.txt && hashcat -m 11400 hash.txt /usr/share/wordlists/rockyou.txt
Add a rule set to mutate dictionary words (capitalisation, leetspeak, appended digits) and dramatically widen coverage:
echo '$sip$*72087*1215344588*...' > hash.txt && hashcat -m 11400 hash.txt /usr/share/wordlists/rockyou.txt -r /usr/share/hashcat/rules/best64.rule
Cracking SIP digest authentication with John the Ripper
John the Ripper can attack the same hash with the SIP format:
echo '$sip$*72087*1215344588*...' > hash.txt && john --format=SIP --wordlist=/usr/share/wordlists/rockyou.txt hash.txt