Hawkynt

Cascade(Serpent,Twofish)

Sequential chaining of Serpent and Twofish block ciphers. Encrypts with Serpent first, then Twofish. Provides increased security margin through cipher diversity.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher Construction
Security status	Not classified
Complexity	Advanced
Inventor	Jack Lloyd (Botan Library)
Year	2010
Origin	Not specified
Source	algorithms/block/cascade.js

Parameters

Parameter	Supported values
Key sizes	64 bytes (512 bits)
Block sizes	16 bytes (128 bits)

Security

Status: not classified — treat as unverified.

No vulnerabilities are recorded for this implementation.

Documentation

• Botan CASCADE Implementation (Header)
• Botan CASCADE Implementation (Source)
• Botan Test Vectors

References

• Cipher Cascading - Wikipedia
• Botan Cryptography Library

Test vectors

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

Vector 1 — Botan cascade.vec - Cascade(Serpent,Twofish) vector 1

Field	Value
key	b50638f695afa16f9378d43374ca8568 600135ecd1e513838722366346bc4b21 01422291558faa30a3196cbeb42e67f4 c075882482897f72a8a30ae9b3ad426d
input	0000000000000000000000000000000000000000000000000000000000000000
expected	e78516d21d23da501939c24c48bcc79de78516d21d23da501939c24c48bcc79d

Vector 2 — Botan cascade.vec - Cascade(Serpent,Twofish) vector 2

Field	Value
key	9e8f6bc09768aed8f533fa4fc35ff6fe b8020ffbc8350ddfd20aca7ecf1889cf bfcd78e261b9a3cd825401afa7adcdfa 88dba8230fb92d4b942c25ee92f27a02
input	47cb8147c5290d6f94fbf3351777087fa731610a3f66e3ccfa6d9b18f980e687
expected	f234e056923b3db26aabc8f604f0ce2c1a7f4c35b0b74958014d791668ff6bf4

Vector 3 — Botan cascade.vec - Cascade(Serpent,Twofish) vector 3

Field	Value
key	1ef34e47005028f2d95120052855c600 1225200a333ca4d7d5a356b5554ee2ae 7ebc9ba57bada0dafc84c2187c51cb3c cb5eee40f27c00537fffca2851dd8bd8
input	b9a28d32734ef678bacd5539ff9ff951 af81f44afe223256e5d8898fb862a767 b90bd2d95e17e4411d02d49481cce419 1ee2c7ae8ebdf6312bdc66317ad42140
expected	065e390c4fd10e9929f30d89a67e0d4c fa3af90bef46b2b435b53cbe0b7dd1b6 12d4c5e2d03028b488000c06517434fc 70f7b62c273ca5debd9ca7034d853087

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