Protocol: Hash Lookup

SHA-1 hash
reverse lookup.

Paste a SHA-1 hex digest (40 characters). We compare against rockyou and return the matching plaintext for known hashes.

check_circle Example: SHA-1 of password is 5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8

SHA-1 Password Hash Search

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About SHA-1

The Secure Hash Algorithm 1 produces a 160-bit (40 hex character) digest. Published by NIST in 1995, SHA-1 was used widely in TLS, SSH, Git, and password storage. It has been deprecated for security-sensitive use since the late 2000s and effectively broken since Google and CWI Amsterdam demonstrated a practical SHAttered collision in 2017.

Generating SHA-1 hashes 

echo -n password | sha1sum -
5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8  -
>>> import hashlib
>>> hashlib.sha1(b'password').hexdigest()
'5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8'

Where SHA-1 still appears

SHA-1 persists in legacy password databases, Git object IDs (moving to SHA-256), and some older PKI chains. Never use it for new password storage — prefer SHA-256, SHA-3, or a password-specific KDF like bcrypt or Argon2.