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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteIEEE 802.11i-2004 is a foundational wireless-LAN security amendment, not the current Wi-Fi security standard. It introduced the Robust Security Network (RSN) framework and defined key mechanisms including TKIP, CCMP, the 4-Way Handshake, and the Group Key Handshake. Its security work became part of later IEEE 802.11 releases; WPA2 is closely associated with 802.11i, but the terms are not interchangeable in every technical context.
What is IEEE 802.11i?
IEEE 802.11i-2004, titled “MAC Security Enhancements,” was Amendment 6 to the IEEE 802.11 wireless-LAN standard. The IEEE Standards Association records its board approval on June 24, 2004, and publication on July 24, 2004. It was designed to move Wi-Fi security beyond the weaknesses of WEP-era protection.
The amendment specified two RSN data-protection protocols, TKIP and CCMP; introduced the security-association concept; defined the 4-Way Handshake and Group Key Handshake; and described how IEEE 802.1X could be used for authentication. IEEE now labels 802.11i-2004 a “Superseded Standard.” That means it is useful for understanding how modern Wi-Fi security developed, but it should not be treated as the current standalone specification.
Is 802.11i the same as WPA2?
No. 802.11i is an IEEE standards amendment; WPA2 is a Wi-Fi Alliance security certification program associated with implementation of the RSN security framework that 802.11i established. They overlap substantially in the security mechanisms people commonly mean when discussing WPA2, which is why the names are sometimes used loosely. But one names an IEEE standards document and the other a certification program, so they are not exact synonyms.
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For practical purposes, a router’s WPA2 setting refers to a Wi-Fi security mode, while 802.11i identifies the historical IEEE amendment behind much of that security architecture. Later IEEE 802.11 editions incorporated and developed the mechanisms further.
TKIP vs. CCMP: which should you use?
CCMP is the stronger and more appropriate choice for new deployments when supported by the network’s devices. It uses AES. TKIP is a legacy compatibility mechanism based on RC4 and should not be treated as a modern default. The National Institute of Standards and Technology (NIST) states that among WEP, TKIP, and CCMP, only CCMP uses a FIPS-approved core cryptographic algorithm, AES; NIST required CCMP for federal-agency IEEE 802.11 WLANs in its guidance.
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| Protocol | Security basis | Practical role |
|---|---|---|
| TKIP | Legacy RC4-based mechanism; not the FIPS-approved AES option identified by NIST. | May be relevant when supporting older equipment, but do not choose it as a modern default. Check device and vendor guidance before enabling legacy compatibility. |
| CCMP | Uses AES, the FIPS-approved core algorithm identified by NIST. | Prefer it over TKIP for supported deployments; NIST specified it for federal-agency WLANs in SP 800-97. |
The NIST requirement is stated in SP 800-97, published in February 2007 and withdrawn on December 31, 2025. It is evidence of the document’s historical recommendation, not a current federal configuration mandate. For a current network, use the security modes supported by current IEEE standards, the Wi-Fi Alliance program applicable to the equipment, and the device vendor’s current guidance.
How authentication and key management work
Authentication establishes who or what may join a WLAN; data protection encrypts traffic; and key management establishes and refreshes the keys devices use. 802.11i covers how these pieces fit together, but they are distinct jobs.
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Enterprise: IEEE 802.1X and EAP
In an enterprise WLAN, a client typically authenticates through IEEE 802.1X using an Extensible Authentication Protocol (EAP) method, with an authentication server involved. This is suited to managed networks that need user or device authentication rather than one shared password for everyone. The exact EAP method and server configuration depend on the organization’s deployment.
Personal networks: PSK
In a simpler personal WLAN, a pre-shared key (PSK) is used instead of enterprise 802.1X authentication. Devices use the shared network credential as the basis for establishing the keys needed for protected communication. A PSK network does not provide the same per-user authentication model as an enterprise 802.1X/EAP deployment.
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What does the 4-Way Handshake do?
The 4-Way Handshake is a key-establishment exchange between a client station and the access point. After authentication or PSK-based key establishment, it confirms that both sides possess the necessary key material and derives fresh session keys for protected communication. It is not itself a user-authentication method, and it does not replace the encryption protocol that protects data frames.
- Key material is available: the station and access point have the prerequisite key material from the selected authentication process.
- The access point begins the exchange: it sends handshake information, including a fresh nonce, to the station.
- The station proves possession: it derives key material and returns a response that demonstrates it can use the shared secret.
- Both sides confirm and install keys: the exchange concludes with confirmation, enabling the parties to use derived session keys.
The Group Key Handshake serves a different purpose: it distributes group key material, such as keys used for broadcast or multicast traffic. IEEE 802.11i names and defines both handshakes as security-association management protocols.
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Is NIST SP 800-97 still current?
No. NIST’s Computer Security Resource Center lifecycle page records SP 800-97, Establishing Wireless Robust Security Networks: A Guide to IEEE 802.11i, as withdrawn on December 31, 2025, because it had become technologically outdated. NIST directs readers to IEEE 802.11 for current Wi-Fi security standards.
SP 800-97 remains useful for historical explanation of the transition from WEP-era protection to robust security networks, its authentication approaches, and deployment examples. Do not rely on it as current configuration guidance. For present-day requirements, consult the current IEEE 802.11 standard and current Wi-Fi Alliance material for the relevant security generation and equipment.
Quick Recap
What to take away when configuring a WLAN
- Choose a current security mode supported by all devices and recommended by their vendors; do not assume that a 2004 amendment label describes the latest security options.
- Prefer CCMP over TKIP where both are offered and supported. Retain TKIP only when a specific legacy-compatibility need justifies it.
- Use enterprise 802.1X/EAP where individual or managed authentication is required; use PSK for simpler personal networks.
- Distinguish authentication, the 4-Way Handshake, and data encryption: they contribute different parts of WLAN security.
- Treat IEEE 802.11i and NIST SP 800-97 as foundational historical references, not as substitutes for current standards and vendor instructions.
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