MD4 Hash Generator
Compute an MD4 digest. Completely broken, but still needed to read NTLM password hashes and some legacy formats.
Input
MD4
Enter something above to see the result.
Kept for reading old data, not for new work
These predate MD5 and are broken far beyond it — MD4 collisions can be produced by hand. They are here because data hashed with them still exists: NTLM password hashes are MD4, and MD2 turns up in X.509 certificates issued decades ago.
Never use either for anything new. If you are looking at an MD4 hash because you are auditing NTLM, the finding is that NTLM itself needs replacing.
Frequently asked questions
Can these be reversed?
Not by inverting the function, but both are so weak and so well-tabulated that any short input is found instantly in a lookup table.
Why is MD2 so slow?
It was designed for 8-bit machines and processes the input through a byte-wise permutation table 18 times per block. Everything since is faster.