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ZUC-256

Enhanced word-oriented stream cipher with 16-stage LFSR over GF(2^31-1). Successor to ZUC-128 for next-generation 5G/6G mobile communications with 256-bit keys and 200-bit IVs.

Properties

Property	Value
Category	Stream Ciphers
Sub-category	3GPP Stream Cipher
Security status	🎓 Educational Only
Complexity	Expert
Inventor	DACAS (Data Assurance and Communication Security Research Center)
Year	2018
Origin	🇨🇳 China
Source	algorithms/stream/zuc256.js

Parameters

Parameter	Supported values
Key sizes	32 bytes (256 bits)
Nonce sizes	25 bytes (200 bits)

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• ZUC-256 Algorithm Specification
• 3GPP Security Algorithms

References

• GmSSL C Reference Implementation (ZUC256)

Test vectors

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

Vector 1 — ZUC-256 Test Vector 1 - All zeros

Field	Value
key	0000000000000000000000000000000000000000000000000000000000000000
iv	00000000000000000000000000000000000000000000000000
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	58d03ad62e032ce2dafc683a39bdcb03 52a2bc67f1b7de74163ce3a101ef5558 9639d75b95fa681b7f090df756391ccc 903b7612744d544c17bc3fad8b163b08

Vector 2 — ZUC-256 Test Vector 2 - All ones pattern

Field	Value
key	ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
iv	ffffffffffffffffffffffffffffffffff3f3f3f3f3f3f3f3f
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	3356cbaed1a1c18b6baa4ffe343f777c 9e15128f251ab65b949f7b26ef7157f2 96dd2fa9df95e3ee7a5be02ec32ba585 505af316c2f9ded27cdbd935e441ce11

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