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MUGI Stream Cipher

Educational implementation of MUGI stream cipher. MUGI is a word-oriented stream cipher with a 128-bit key and 128-bit internal state, designed for high-speed software implementation.

Properties

Property	Value
Category	Stream Ciphers
Sub-category	Stream Cipher
Security status	🎓 Educational Only
Complexity	Not specified
Inventor	Dai Watanabe, Soichi Furuya, Hirotaka Yoshida, Kazuo Takaragi, Bart Preneel
Year	2002
Origin	JP
Source	algorithms/stream/mugi.js

Security

Status: 🎓 Educational Only

MUGI is a Japanese stream cipher designed for efficient software implementation. This educational version demonstrates the basic principles.

No vulnerabilities are recorded for this implementation.

Documentation

• Hitachi MUGI Specification and Self-Evaluation Report
• MUGI - Wikipedia
• ISO/IEC 18033-4:2011 Encryption algorithms - Part 4: Stream ciphers

References

• Hitachi MUGI Specification Ver. 1.2 (reference algorithm description, PDF)
• CRYPTREC Evaluation of the MUGI Pseudorandom Number Generator (ANSI-C reference implementation benchmark)

Test vectors

1 vector ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — Self-computed vector: output of this simplified educational MUGI-inspired construction, verified for self-consistency (not an official Hitachi MUGI test vector - this implementation approximates MUGI’s design principles rather than the exact ISO/IEC 18033-4 algorithm)

Field	Value
key	00010203040506070809101112131415
input	0001020304050607
expected	519970858a85daaa

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