SEAL-3.0-BE
Software-optimized stream cipher designed by Rogaway and Coppersmith using SHA-1-based table generation. Generates 1024 bytes of keystream per iteration. Big-endian variant. Broken - theoretical attacks exist.
Properties
| Property |
Value |
| Category |
Stream Ciphers |
| Sub-category |
Stream Cipher |
| Security status |
❌ Broken |
| Complexity |
Advanced |
| Inventor |
Phil Rogaway, Don Coppersmith |
| Year |
1994 |
| Origin |
🇺🇸 United States |
| Source |
algorithms/stream/seal.js |
Parameters
| Parameter |
Supported values |
| Key sizes |
20 bytes (160 bits) |
| IV sizes |
4 bytes (32 bits) |
Capabilities
| Flag |
Value |
isBigEndian |
Yes |
Security
Status: ❌ Broken
Known vulnerabilities
| Issue |
Description |
Mitigation |
| SEAL has known theoretical weaknesses and is considered broken for modern cryptographic applications. |
— |
Use modern stream ciphers like ChaCha20 or XSalsa20 for new systems. |
Documentation
References
Test vectors
2 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — Crypto++ SEAL-3.0-BE Test Vector
| Field |
Value |
key |
67452301efcdab8998badcfe10325476c3d2e1f0 |
iv |
013577af |
input |
00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 … (1024 bytes; the full value is in the source) |
expected |
37a005959b84c49ca4be1e050673530f 5fb097fdf6a13fbd6c2cdecd81fdee7c 2abdc3e764209aff00a12283ef675085 c1634b53289059e6a7ab5ed9480c01eb … (1024 bytes; the full value is in the source) |
Vector 2 — DarkCrypt Seal3lib KERNEL vector (SEAL 3.0, key=00..13, iv=00000000)
| Field |
Value |
key |
000102030405060708090a0b0c0d0e0f10111213 |
iv |
00000000 |
input |
00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 |
expected |
ea180e1c72b8bc5d0bb53bc0e6f2eba6 e19436e7cbcaca18fe01dbcc4407fe61 5748a47ad2f6aec393a0efa009bd4ce1 a45a669a584ab53bb54069740c7dc485 654817d3974ed3f5ee3cd373916d0f3b d1dd0544166cbc5fc30a4a0078aead7b e56fd8bc11e81e8498c6354ee2fbe434 31a1223527e11a3ef739954d9732edfc |
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