SC2000 variant from the DarkCrypt Total Commander plugin: always runs 6.5 rounds (56 round-key words) regardless of key size, whereas the published CRYPTREC/NESSIE spec calls for 7.5 rounds with 256-bit keys. 128-bit block, 256-bit key only.
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Block Cipher |
| Security status | 🎓 Educational Only |
| Complexity | Expert |
| Inventor | Takeshi Shimoyama, Hirotaka Yanami, et al. (Fujitsu Labs, base algorithm); DarkCrypt variant by Alexander Myasnikov |
| Year | 2000 |
| Origin | 🇷🇺 Russia |
| Source | algorithms/block/darkcrypt-sc2000.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 32 bytes (256 bits) |
| Block sizes | 16 bytes (128 bits) |
Status: 🎓 Educational Only
| Issue | Description | Mitigation |
|---|---|---|
| Non-standard variant / round-count deviation | Always runs 6.5 rounds with a 256-bit key (spec calls for 7.5); unanalyzed at this round count and not recommended for real use. | 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 Sc2000 — zero key/plaintext
| Field | Value |
|---|---|
key |
0000000000000000000000000000000000000000000000000000000000000000 |
input |
00000000000000000000000000000000 |
expected |
a3bae4fac0c472bba5a4b96032abb2c4 |
Vector 2 — DarkCrypt Sc2000 — incrementing key/plaintext
| Field | Value |
|---|---|
key |
000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f |
input |
000102030405060708090a0b0c0d0e0f |
expected |
8d53448d8ec85ce6eae7e9092035b267 |
Vector 3 — DarkCrypt Sc2000 — shifted incrementing key/plaintext
| Field | Value |
|---|---|
key |
0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20 |
input |
101112131415161718191a1b1c1d1e1f |
expected |
f9bccd4158dfae69184d14098d7bb939 |