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WPA mandates the use of the RC 4 stream cipher with a 128 – bit key and a 48 – bit initialization vector (IV), compared with the 40 – bit key and the 24 – bit IV in WEP. The WPA protocol works in a similar way to WEP. This mechanism is called the Pre-Shared Key (PSK) mode. Personal deployment of WPA adopts a simpler mechanism, which allows all stations to use the same key. Enterprise deployment of WPA is required to be used with IEEE 802.1x authentication, which is responsible for distributing different keys to each user. WPA has been designed to target both enterprise and consumers. Hongbing Cheng, in Network and System Security (Second Edition), 2014 WPA We'll discuss more details and provide a comparative study in Chapter 6.Ĭhunming Rong. There is a push for an SDIO interface because of its lower power features, but many Wi-Fi chips still continue to use PCI. And, as usual, USB is the preferred interface, if and when the Wi-Fi module has to be connected externally. Currently PCI and SDIO are two of the prevalent interfaces when the Wi-Fi module is connected as an integral part of the system. Since by definition mobile infotainment SoCs are mobile in nature and they need to connect to the Internet for information/entertainment content, it's imperative that Wi-Fi has good throughput and consumes as little power as possible. Wi-Fi is a trademarked term owned by Wi-Fi alliance it refers to implementation of IEEE 802.11 standard for WLAN. It uses 2.4-GHz UHF or 5-GHz SHF radio waves. Wi-Fi is a technology to enable electronic devices to communicate and/or connect to the Internet without wire. Vijayakrishnan Rousseau, in System on Chip Interfaces for Low Power Design, 2016 Wi-Fi/wireless LAN