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and mask attacks because results are nearly instantaneous on modern hardware. For any modern security application, CRC32 should be replaced with stronger algorithms like
One common use case for CRC32 cracking is recovering the names of files inside a password-protected ZIP archive where the filenames are obfuscated but the CRC32 checksums are visible. Extract the CRC32: Use a tool like 7z l -slt archive.zip to see the checksums. Run Hashcat:
To crack CRC32 hashes with Hashcat, you must use . The Specific Hash Format hashcat crc32
On a modern CPU (Intel i9-13900K, single core):
Note: CRC32 is faster than NTLM, but NTLM is also broken. Neither should be used for passwords.
If you need to verify that data has not been maliciously tampered with, replace CRC32 with BLAKE3 , SHA-256 , or SHA-3 . This public link is valid for 7 days
: Hashcat requires a "salt" field for this mode. If the hash is unsalted, you must append :00000000 to the hex value to avoid a "Line-length exception". Example Input : c762de4a:00000000 2. Common Attack Modes
Because a CRC32 checksum is exactly 32 bits long, there are only 2322 to the 32nd power ) possible unique checksum values.
You can also verify Hashcat can see your hardware accelerators with: hashcat -I . Can’t copy the link right now
(Functional, but often the wrong tool for the job).
Keep in mind that cracking CRC32 hashes is relatively easy due to the algorithm's design. If you're trying to crack a password, consider using more secure password storage mechanisms, such as bcrypt, scrypt, or Argon2.
Unlike cryptographic hashes (like SHA-256), CRC32 is designed only to detect accidental changes to raw data. This makes it "weak" for security purposes in two major ways: With only 2322 to the 32nd power