REDOC III variant from the DarkCrypt Total Commander plugin: an 80-bit block (only the first 8 bytes are transformed, the last 2 pass through unchanged), 256-bit key. Key-dependent 2560-byte pseudorandom table (classic LCG) folded into a 16-byte subkey; two masking passes select table rows that get XORed into the other working bytes.
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Block Cipher |
| Security status | 🎓 Educational Only |
| Complexity | Advanced |
| Inventor | IBM Research (Michael Wood); DarkCrypt variant by Alexander Myasnikov |
| Year | 1985 |
| Origin | 🇷🇺 Russia |
| Source | algorithms/block/darkcrypt-redoc3.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 32 bytes (256 bits) |
| Block sizes | 10 bytes (80 bits) |
Status: 🎓 Educational Only
| Issue | Description | Mitigation |
|---|---|---|
| Non-standard, unanalyzed variant | Only the last 2 of 10 block bytes are unprotected pass-through. Not analyzed for cryptographic strength. | 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 Redoc3 — zero key/plaintext
| Field | Value |
|---|---|
key |
0000000000000000000000000000000000000000000000000000000000000000 |
input |
00000000000000000000 |
expected |
59384d4a4be0617b0000 |
Vector 2 — DarkCrypt Redoc3 — incrementing key/plaintext
| Field | Value |
|---|---|
key |
000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f |
input |
00010203040506070809 |
expected |
84c182949e2875270809 |
Vector 3 — DarkCrypt Redoc3 — shifted incrementing key/plaintext
| Field | Value |
|---|---|
key |
0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20 |
input |
10111213141516171819 |
expected |
dba910c8db2fb2ae1819 |