4-Way Handshake Authorization Using Encrypted Device IDs
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Solution Overview
Problem
WPA2 and WPA3 wireless security protocols face challenges in privacy and scalability due to the use of shared passphrases and cleartext password identifiers, which can compromise network security and user privacy.
Innovation Solution
Decouple authentication from authorization by using encrypted authorization IDs within the 4-way handshake process, allowing device-specific policies without additional complexity or performance overhead, and protect against man-in-the-middle attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If shared passphrase or PPSK is used for authentication, then authentication simplicity is improved, but network security and privacy are worsened due to brute-force attacks and key compromise
Solution Approach 1:
The patent segments the authentication process into two independent phases: authentication (using shared passphrase/SAE) and authorization (using encrypted authorization ID). This separation allows each phase to use optimized security mechanisms, resolving the contradiction between simplicity and security.
Solution Approach 2:
The patent introduces an encrypted authorization ID as an intermediary element that carries device-specific authorization information without exposing the shared passphrase. This intermediary enables secure device identification and policy enforcement without compromising the simplicity of shared passphrase authentication.
2Adaptability or versatility
If password identifiers are sent in cleartext during SAE, then device identification capability is improved, but user privacy is worsened
Solution Approach 1:
The patent uses an encrypted authorization ID as an intermediary that provides device identification capability while protecting user privacy. The encryption ensures that the authorization ID cannot be read or correlated by eavesdroppers, preventing privacy loss while maintaining adaptability for device-specific policies.
Solution Approach 2:
The patent changes the state of the authorization ID from cleartext to encrypted form, transforming it from a privacy-risking parameter to a privacy-protecting parameter. This parameter change maintains the functional capability of device identification while eliminating the privacy vulnerability.
3Reliability
If device-specific authorization is implemented, then network security and policy control are improved, but system complexity is worsened
Solution Approach 1:
The patent merges the authorization ID transmission into the existing 4-way handshake process, combining authorization functionality with the already-complex authentication handshake. This merging approach avoids adding separate complex authorization protocols while still enabling device-specific control.
Solution Approach 2:
The patent implements self-service authorization where the client device independently generates and transmits its own authorization ID, and the network device independently verifies it against stored authorization data. This self-service approach distributes the complexity burden and eliminates the need for complex centralized authorization management infrastructure.
Data Source
AI summary
The present disclosure provides techniques for device authorization using a per-device identifier. A network device authenticates a client device using simultaneous authentication of equals (SAE) with a shared passphrase. After completing association, the network device sends a first message to the client device, comprising an access point (AP)-generated random value to the client device. The network device receives a second message from the client device, comprising a station (STA)-generated random value and an authorization identifier. The network device decrypts the authorization identifier using a session key. In response to determining that the authorization identifier matches an entry in the authorization database, the network device sends a third message confirming authorization of the client device as a trusted entity. The network device receives a fourth message confirming completion of a security key exchange.