Is a md5(sha1($pass)) hash reversible?

No. md5(sha1($pass)) is a one-way hash; you cannot reverse it. You can only guess inputs and compare, which is what hashcat and John do.

What is the hashcat mode for md5(sha1($pass))?

Use `-m 4400` to tell hashcat to treat the input as md5(sha1($pass)).

How long does it take to crack md5(sha1($pass))?

md5(sha1($pass)) is fast to compute, so weak passwords often fall in seconds to minutes on a GPU; strong, long passwords remain infeasible.

Is a md5(sha1($pass)) hash reversible?

No. md5(sha1($pass)) is a one-way hash; you cannot reverse it. You can only guess inputs and compare, which is what hashcat and John do.

What is the hashcat mode for md5(sha1($pass))?

Use `-m 4400` to tell hashcat to treat the input as md5(sha1($pass)).

How long does it take to crack md5(sha1($pass))?

md5(sha1($pass)) is fast to compute, so weak passwords often fall in seconds to minutes on a GPU; strong, long passwords remain infeasible.

How to identify and crack a md5(sha1($pass)) hash

md5(sha1($pass)) is a raw / unsalted 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 md5(sha1($pass)) entirely in your browser — your hash is never uploaded. A typical example looks like this:

288496df99b33f8f75a7ce4837d1b480

Cracking md5(sha1($pass)) with hashcat

Save the hash to a file and run hashcat in mode -m 4400. Start with a wordlist such as rockyou.txt:

echo '288496df99b33f8f75a7ce4837d1b480' > hash.txt && hashcat -m 4400 hash.txt /usr/share/wordlists/rockyou.txt

Add a rule set to mutate dictionary words (capitalisation, leetspeak, appended digits) and dramatically widen coverage:

echo '288496df99b33f8f75a7ce4837d1b480' > hash.txt && hashcat -m 4400 hash.txt /usr/share/wordlists/rockyou.txt -r /usr/share/hashcat/rules/best64.rule