3GPP standardized stream cipher for UMTS/3G networks. Used in UEA2 confidentiality and UIA2 integrity algorithms. Features LFSR-based design with FSM and operates on 128-bit keys and IVs.
| Property | Value |
|---|---|
| Category | Stream Ciphers |
| Sub-category | 3GPP Stream Cipher |
| Security status | 🛡️ Secure |
| Complexity | Expert |
| Inventor | P. Ekdahl, T. Johansson |
| Year | 2003 |
| Origin | 🇸🇪 Sweden |
| Source | algorithms/stream/snow3g.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 16 bytes (128 bits) |
| Nonce sizes | 16 bytes (128 bits) |
Status: 🛡️ Secure
| Issue | Description | Mitigation |
|---|---|---|
| Theoretical Attacks | Some theoretical cryptanalytic attacks exist but require impractical amounts of data | Attacks not practical for real-world 3G usage scenarios |
4 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — 3GPP TS 35.217 SNOW 3G Test Set 1
| Field | Value |
|---|---|
key |
2bd6459f82c5b300952c49104881ff48 |
iv |
ea024714ad5c4d84df1f9b251c0bf45f |
input |
0000000000000000 |
expected |
abee97047ac31373 |
Vector 2 — 3GPP TS 35.217 SNOW 3G Test Set 2
| Field | Value |
|---|---|
key |
8ce33e2cc3c0b5fc1f3de8a6dc66b1f3 |
iv |
d3c5d592327fb11cde551988ceb2f9b7 |
input |
0000000000000000 |
expected |
eff8a342f751480f |
Vector 3 — 3GPP TS 35.217 SNOW 3G Test Set 3
| Field | Value |
|---|---|
key |
4035c6680af8c6d1a8ff8667b1714013 |
iv |
62a540981ba6f9b74592b0e78690f71b |
input |
0000000000000000 |
expected |
a8c874a97ae7c4f8 |
Vector 4 — 3GPP TS 35.217 SNOW 3G Test Set 4
| Field | Value |
|---|---|
key |
0ded7263109cf92e3352255a140e0f76 |
iv |
6b68079a41a7c4c91befd79f7fdcc233 |
input |
0000000000000000 |
expected |
d712c05ca937c2a6 |