Hawkynt

SPIX

Lightweight AEAD cipher using MonkeyDuplex construction with sLiSCP-light-256 permutation. Features 128-bit key/nonce/tag with 8-byte rate for efficient authenticated encryption.

Properties

Property	Value
Category	Authenticated Encryption
Sub-category	Lightweight Cryptography
Security status	🧪 Experimental
Complexity	Advanced
Inventor	Tao Huang, Junjie Bi, Zhenzhen Bao, Jiale Guo
Year	2019
Origin	🌐 International
Source	algorithms/aead/spix.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Nonce sizes	16 bytes (128 bits)
Tag sizes	16 bytes (128 bits)

Capabilities

Flag	Value
SupportsDetached	No

Security

Status: 🧪 Experimental

No vulnerabilities are recorded for this implementation.

Documentation

• SPIX Specification
• NIST LWC Project

References

• rweather/lightweight-crypto C Reference Implementation

Test vectors

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

Vector 1 — SPIX: Empty message, empty AAD (Count 1)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
aad	(empty)
input	(empty)
expected	74d5a923739b1f893c7c005df8349b62

Vector 2 — SPIX: Empty message, 1-byte AAD (Count 2)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
aad	00
input	(empty)
expected	8206dfcb92d667f617328ebcc6a38ac9

Vector 3 — SPIX: Empty message, 2-byte AAD (Count 3)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
aad	0001
input	(empty)
expected	a012ddf1716623239f7813d122c7c42c

Vector 4 — SPIX: 1-byte plaintext, empty AAD (Count 34)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
aad	(empty)
input	00
expected	2a071d7de31a45dddad7d2b3086e41950f

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