| name | structure | Block sizes | date First publication | Key sizes | Rounds |
|---|---|---|---|---|---|
| Information Concealment Engine | Feistel Network | 64 bits | 1997 | 64 bits (ICE), 64×n bits (ICE-n) | 16 |
| Triple des | Feistel Network | 64 bits | 1998 | 168, 112 or 56 bits (keying option 1, 2, 3 respectively) | 48 |
| Twofish | Feistel Network | 128 bits | 1998 | 128, 192 or 256 bits | 16 |
| Xenon | Feistel Network | 128 bits | 2000 | 128, 192, or 256 bits | 16 |
| BTEA | Feistel Network | 64 bits | 1997 | 128 bits | 64 |