Experimental Rijndael variant with key-dependent S-boxes and operations. 128-bit blocks, 10 rounds, designed for enhanced security through key-dependent transformations.
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Block Cipher |
| Security status | 🧪 Experimental |
| Complexity | Advanced |
| Inventor | Johan Borst |
| Year | 2000 |
| Origin | 🇳🇱 Netherlands |
| Source | algorithms/block/grand-cru.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 16 bytes (128 bits) |
| Block sizes | 16 bytes (128 bits) |
Status: 🧪 Experimental
| Issue | Description | Mitigation |
|---|---|---|
| Limited cryptanalysis | Grand Cru was not selected by NESSIE and has received minimal public cryptanalysis. | Use well-established algorithms like AES for production systems. |
| Weak key-dependent operations | Key-dependent S-box generation may not provide expected security benefits and could introduce weaknesses. | Avoid using Grand Cru in security-critical applications. |
4 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — Grand Cru synthetic test vector #1
Source: Generated from implementation for consistency verification
| Field | Value |
|---|---|
key |
000102030405060708090a0b0c0d0e0f |
input |
00112233445566778899aabbccddeeff |
expected |
71de5e5bf5e1983cbc13f15601efe59a |
Vector 2 — Grand Cru synthetic test vector #2 (all zeros)
Source: Generated from implementation for consistency verification
| Field | Value |
|---|---|
key |
00000000000000000000000000000000 |
input |
00000000000000000000000000000000 |
expected |
6b4791315ffd4d34b9e85ae6d88829ab |
Vector 3 — Grand Cru synthetic test vector #3 (all ones)
Source: Generated from implementation for consistency verification
| Field | Value |
|---|---|
key |
ffffffffffffffffffffffffffffffff |
input |
ffffffffffffffffffffffffffffffff |
expected |
c10a7527a61765e2606bec10a86ad75e |
Vector 4 — Grand Cru synthetic test vector #4 (mixed pattern)
Source: Generated from implementation for consistency verification
| Field | Value |
|---|---|
key |
fedcba98765432100123456789abcdef |
input |
0123456789abcdeffedcba9876543210 |
expected |
09cc7353d442f37f3d74a663fe74338e |