Variable Encryption Standard stream cipher with configurable key sizes and word-based operations. Submitted to eSTREAM but not selected for final portfolio due to cryptanalytic concerns.
| Property | Value |
|---|---|
| Category | Stream Ciphers |
| Sub-category | Stream Cipher |
| Security status | 🎓 Educational Only |
| Complexity | Advanced |
| Inventor | Sean O’Neil |
| Year | 2005 |
| Origin | 🇺🇸 United States |
| Source | algorithms/stream/vest.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 8 bytes (64 bits); 10 bytes (80 bits); 12 bytes (96 bits); 14 bytes (112 bits); 16 bytes (128 bits) |
| Nonce sizes | 8 bytes (64 bits) to 16 bytes (128 bits) in steps of 2 bytes |
Status: 🎓 Educational Only
| Issue | Description | Mitigation |
|---|---|---|
| Cryptanalytic Concerns | Not selected for eSTREAM final portfolio due to security concerns | — |
2 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — VEST basic test vector with 128-bit key and IV
Source: Educational implementation test
| Field | Value |
|---|---|
key |
564553542074657374206b6579203136 |
iv |
5645535420746573742049562031362e |
input |
48656c6c6f205645535421 |
expected |
b789d192d0dea9dbadefdf |
Vector 2 — VEST with 64-bit key (minimum size)
Source: Educational implementation test
| Field | Value |
|---|---|
key |
564553546b657938 |
iv |
5645535469763634 |
input |
4d696e696d756d |
expected |
b38591979b8992 |