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F9

F9 is the integrity algorithm used in 3GPP/UMTS mobile communications. Uses KASUMI block cipher with dual-key MAC construction for message authentication.

Properties

Property	Value
Category	Message Authentication
Sub-category	Block Cipher MAC
Security status	⚠️ Deprecated
Complexity	Intermediate
Inventor	3GPP
Year	1999
Origin	Not specified
Source	algorithms/mac/f9.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Tag sizes	4 bytes (32 bits) to 8 bytes (64 bits)

Capabilities

Flag	Value
NeedsKey	Yes

Security

Status: ⚠️ Deprecated

No vulnerabilities are recorded for this implementation.

Documentation

• 3GPP TS 35.201
• 3GPP Security Algorithms

References

• LibTomCrypt F9

Test vectors

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

Vector 1 — F9: 20-byte message (LibTomCrypt)

Field	Value
key	2bd6459f82c5b300952c49104881ff48
input	38a6f056b8aefda9333234626339386137347940
expected	46e00d4b

Vector 2 — F9: 105-byte message (LibTomCrypt)

Field	Value
key	83fd23a244a74cf358da3019f1722635
input	36af61444f302ad235c68716633c66fb 750c266865d53c11ea05b1e9fa49c839 8d48e1efa5909d3947902837f5ae96d5 a05bc8d61ca8dbef1b13a4b4abfe4fb1 006045b674bb54729304c382be53a5af 05556176f6eaa2ef1d05e4b083181ee6 74cda5a485f74d7ac0
expected	95ae41ba

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