MMB2 (revision of Daemen’s MMB) as implemented in the DarkCrypt Total Commander plugin: 128-bit block/key, 6 rounds of key mixing plus theta diffusion, plus a final whitening stage. This implementation carries a quirk where the intended modular multiplication step is computed but discarded (a no-op in practice).
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Block Cipher |
| Security status | 🎓 Educational Only |
| Complexity | Intermediate |
| Inventor | Joan Daemen (base MMB/MMB2 lineage); DarkCrypt variant by Alexander Myasnikov |
| Year | 1997 |
| Origin | 🇷🇺 Russia |
| Source | algorithms/block/darkcrypt-mmb2.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 16 bytes (128 bits) |
| Block sizes | 16 bytes (128 bits) |
Status: 🎓 Educational Only
| Issue | Description | Mitigation |
|---|---|---|
| Multiplication step is a no-op in this implementation | The DarkCrypt implementation computes the intended modular multiplication but discards the result before returning, so this variant provides only key-XOR and linear (theta) diffusion — materially weaker than the intended MMB2 design. | Use AES or another vetted cipher. |
3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — DarkCrypt Mmb2 — zero key/plaintext
| Field | Value |
|---|---|
key |
00000000000000000000000000000000 |
input |
00000000000000000000000000000000 |
expected |
9a490200ecc3010000000000ecc30100 |
Vector 2 — DarkCrypt Mmb2 — incrementing key/plaintext
| Field | Value |
|---|---|
key |
000102030405060708090a0b0c0d0e0f |
input |
000102030405060708090a0b0c0d0e0f |
expected |
9e4d0604e0cf0d0c04040404e0cf0d0c |
Vector 3 — DarkCrypt Mmb2 — shifted incrementing key/plaintext
| Field | Value |
|---|---|
key |
0102030405060708090a0b0c0d0e0f10 |
input |
101112131415161718191a1b1c1d1e1f |
expected |
25f4bd21f1dc1c0b1517151bf1dc1c0b |