Hawkynt

Phelix

Educational implementation inspired by Phelix stream cipher. eSTREAM candidate designed for high-speed authenticated encryption using XOR, addition mod 2^32, and rotation operations.

Properties

Property	Value
Category	Stream Ciphers
Sub-category	Stream Cipher
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	Doug Whiting, Bruce Schneier, Stefan Lucks, Frédéric Muller
Year	2004
Origin	🇺🇸 United States
Source	algorithms/stream/phelix-simple.js

Parameters

Parameter	Supported values
Key sizes	32 bytes (256 bits)
Block sizes	1 byte (8 bits) to 65536 bytes (524288 bits)

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue	Description	Mitigation
Key Recovery Attack	Wu and Preneel showed key recovery with 2^37 operations when nonces are reused	—
Educational Implementation	Simplified educational implementation - use only for learning	—

Documentation

• Phelix Wikipedia
• eSTREAM Project
• Schneier on Security

References

• Phelix Reference Source Code (Designers)
• Phelix x86-64 Assembler Implementation

Test vectors

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

Vector 1 — Phelix Educational Test Vector 1 (Empty)

Source: Educational test case

Field	Value
key	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
nonce	000102030405060708090a0b0c0d0e0f
input	(empty)
expected	(empty)

Vector 2 — Phelix Educational Test Vector 2 (Single Byte)

Source: Educational test case

Field	Value
key	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
nonce	000102030405060708090a0b0c0d0e0f
input	00
expected	a2

Vector 3 — Phelix Educational Test Vector 3 (Two Bytes)

Source: Educational test case

Field	Value
key	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
nonce	000102030405060708090a0b0c0d0e0f
input	0001
expected	a2ba

Vector 4 — Phelix Educational Test Vector 4 (Block)

Source: Educational test case

Field	Value
key	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
nonce	000102030405060708090a0b0c0d0e0f
input	000102030405060708090a0b0c0d0e0f
expected	a2ba9b5e4109cea6b815e83e3d807d61

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