+- hashcat Forum (https://hashcat.net/forum)
+-- Forum: Support (https://hashcat.net/forum/forum-3.html)
+--- Forum: hashcat (https://hashcat.net/forum/forum-45.html)
+--- Thread: 20 characters long password (/thread-13414.html)
20 characters long password - RX6800 - 10-28-2025
Hello
i've got simple question, how can i crack hash that i know the password is 20 characters long and it is only with numbers. I'm asking for every possible way with Hashcat for exact command for terminal or with any other tool if someone knows?
RE: 20 characters long password - DanielG - 10-29-2025
hashcat.exe -a 3 -m [the mode of your hash] filewithyourhash.txt ?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d
RE: 20 characters long password - RX6800 - 10-29-2025
Code:
sudo hashcat -a 3 -m 22000 464.hc22000 ?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?dand i've got the following output
Code:
hashcat (v7.1.2-319-g710f178cd) starting
First_file_in_directory() failed.
First_file_in_directory() failed.
HIP API (HIP 7.0.51831)
=======================
* Device #01: AMD Radeon RX 6800, 16318/16368 MB, 30MCU
OpenCL API (OpenCL 3.0 ) - Platform #1 [Intel(R) Corporation]
=============================================================
* Device #02: Intel(R) UHD Graphics 770, 22308/44617 MB (2047 MB allocatable), 16MCU
OpenCL API (OpenCL 2.1 AMD-APP (3662.0)) - Platform #2 [Advanced Micro Devices, Inc.]
=====================================================================================
* Device #03: AMD Radeon RX 6800, skipped
Minimum password length supported by kernel: 8
Maximum password length supported by kernel: 63
Minimum salt length supported by kernel: 0
Maximum salt length supported by kernel: 256
Hashes: 1 digests; 1 unique digests, 1 unique salts
Bitmaps: 16 bits, 65536 entries, 0x0000ffff mask, 262144 bytes, 5/13 rotates
Optimizers applied:
* Zero-Byte
* Single-Hash
* Single-Salt
* Brute-Force
* Slow-Hash-SIMD-LOOP
Watchdog: Temperature abort trigger set to 90c
Host memory allocated for this attack: 4857 MB (42670 MB free)
Integer overflow detected in keyspace of mask: ?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d?d
Started: Wed Oct 29 09:48:33 2025
Stopped: Wed Oct 29 09:48:36 2025RE: 20 characters long password - DanielG - 10-29-2025
Yeah 20 digits is in no way practically attackable, you want to check 100000000000000000000 passwords. Your AMD Radeon RX 6800 can do around 1062 kH/s. Which means you need around 2984 millennia to check them all.
RE: 20 characters long password - monyanus - 10-30-2025
Perhaps you should consider if there is any pattern in those 20 digits. For example, if someone would have typed them "randomly", I can assure it is not really random and you could significantly reduce the search space.
For example, many digits would be next to each-other, or they would be based on the user using left right typing, e.g. 1728394 (look random but is only interlaced left right consecutive typing).
If this would be the case, even a 20 digits password can be cracked.