Hawkynt

SCOP-384 (DarkCrypt)

384-bit table-driven stream cipher as implemented in the DarkCrypt Total Commander plugin kernel, built on an imul-chain key schedule and an RC4-like additive combiner. No public specification of DarkCrypt’s own SCOP-384 variant is known.

Properties

Property Value
Category Stream Ciphers
Sub-category Stream Cipher
Security status 🎓 Educational Only
Complexity Intermediate
Inventor Unknown (DarkCrypt variant)
Year 2013
Origin 🇷🇺 Russia
Source algorithms/stream/darkcrypt-scop.js

Parameters

Parameter Supported values
Key sizes 48 bytes (384 bits)
Block sizes 1 byte (8 bits) to 65536 bytes (524288 bits)
Nonce sizes 0 bytes (0 bits)

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue Description Mitigation
Unanalyzed proprietary construction Custom polynomial key schedule and additive (non-XOR) RC4-like combiner with no public design rationale or third-party cryptanalysis. Use a vetted stream cipher.

Documentation

Test vectors

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

Vector 1 — DarkCrypt Scop — keystream from 128 zero bytes, 48-byte incrementing key

Field Value
key 000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f
input 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected e2ee660b62e416934a31c17c949a93e0 5692a0d5a8d4971a4a9e94929823f1e5 d8ed60d1c201d50ad6af1eec1e29917a 6d1ef7cf829d847504dda2f0e010f85f e98d7676c2e5d801da0288a3ee4217bb b2d747f2f5973b4a84bd36c6f291df04 847310e2203cf7b8744230088c1e978c be79febd6d08b9a8bef1356e44d92f0b

Vector 2 — DarkCrypt Scop — encryption of 64 incrementing bytes, 48-byte incrementing key

Field Value
key 000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f
input 000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
expected e2ef680e66e91c9a523acb87a0a7a1ef 66a3b2e8bce9ad3162b7aeadb4400f05 f80e83f4e626fb31fed848174a56bfa9 9d4f2903b6d2baac3c16dd2b1c4e369f

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