Hawkynt

SN3 (DarkCrypt)

Table-driven stream cipher with a 192-word key-dependent S-box, conventionally split into three 64-word tables that rotate roles every 64 steps. Each step mixes one word from each table with rotate/xor updates and a data-dependent second index. From the DarkCrypt Total Commander plugin build.

Properties

Property	Value
Category	Stream Ciphers
Sub-category	Stream Cipher
Security status	🎓 Educational Only
Complexity	Advanced
Inventor	Simeon Maltchev
Year	2002
Origin	Not specified
Source	algorithms/stream/darkcrypt-sn3.js

Parameters

Parameter	Supported values
Key sizes	768 bytes (6144 bits)
Block sizes	1 byte (8 bits) to 65536 bytes (524288 bits)

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue	Description	Mitigation
Unanalyzed construction	Custom stream cipher with no formal public cryptanalysis beyond the designer’s own statistical testing; not recommended for real use.	Use a vetted stream cipher.

Documentation

• DarkCrypt plugin (Total Commander PlugRing)
• The SN3 Stream Cipher (original posting, sci.crypt.research)

Test vectors

2 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — DarkCrypt SN3 - 768-byte key keystream

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f … (768 bytes; the full value is in the source)
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	e535f50705d738004bd02561d095ccc7 9f6561a39435f3324b05369828bc88f8 793b9bc88818357515a03a5f8bd1a364 be26fe53af37c95956085779487fb868 134e4fbcaaa66d45e18cf0ea40b9f561 743b6eafec942283b545a7f8cdfcf711 2d718c4219361fea128316f1b0893421 1c1098eb611081e13ef67dfe3514115d

Vector 2 — DarkCrypt SN3 - incrementing plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f … (768 bytes; the full value is in the source)
input	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
expected	e534f70401d23e0743d92f6adc98c2c8 8f7473b08020e525531c2c8334a196e7 591ab9ebac3d13523d891074a7fc8d4b 8e17cc609b02ff6e6e316d4274428657

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