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The use of Secure Sockets Layer (SSL) and/or Transport Layer Security (TLS) is a critical aspect of online security SSL/TLS is used often by web applications to keep sensitive information private over the Internet, bringing confidentiality and integrity to HTTP (via HTTPS) The need for transport security, via SSL/TLS, between a user s mobile device and its destination is equally important, as a growing number of sensitive online activities take place on the mobile device and not the PC This section will review the use of encryption in both WAP 10 and WAP 20
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In the early days of the mobile WAP world (WAP 10), TLS was used, but not end to end WAP 10 used a three-tiered architecture, including the WAP mobile device, which in turn used a WAP browser, a WAP gateway (also known as a WAP proxy server), and the web/application server on the Internet WAP 10 mobile devices mostly spoke Wireless Markup Language (WML), which is similar to HTML The WAP gateway would translate HTML from the web/application server on the Internet to WML for the WAP browser on the mobile device The use of the WAP gateway was fairly important in the early days because it would encode/decode all the data to/from application servers to fit the data, size, and bandwidth restraints of the mobile devices In terms of security, the WAP gateway also played an important role Due to the limited horsepower on mobile devices (including bandwidth, memory, battery, and CPU), full TLS connectivity between the mobile device and the web/application server was not used Instead, Wireless Transport Layer Security (WTLS) was used between the mobile device and the WAP gateway, and SSL/TLS was used between the WAP gateway and the web/application server (see Figure 9-4) Before we go further, we should pause and talk a bit about WTLS WTLS is similar to TLS and provides transport security between mobile clients and WAP gateways It is based on TLS, but is used for low-bandwidth data channels that would normally not be able to support a full-blown TLS implementation Similar to TLS, WTLS provides confidentiality and integrity using standard block ciphers and MACs The WAP 10/WTLS architecture brought up several concerns for mobile users and security professionals, due to the absence of full end-to-end security The process of converting communication between WTLS and TLS would occur at the WAP gateway (encrypting/decrypting), making it an entity that performs a man-in-the-middle
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Figure 9-4
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9: WAP and Mobile HTML Security
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attack, although legitimately This meant that sensitive information was left in a plain-text format, either in memory or in cache, or even written to disk, on the WAP gateway itself Because the WAP gateway is an entity that is owned and managed by an ISP, not by a bank or e-commerce institution, the ISP would have access to plain-text data from any user using their gateway Although trusting every ISP in the world and their WAP gateways may have looked great on paper, the idea did not float too well with many sending and receiving entities This scenario known in some circles as the WAP gap was not an acceptable option to many organizations because the ISP s WAP gateway could see all the decrypted information to/from the mobile device Whether it is a hostile ISP or simply bad practice, the idea of sensitive information being decrypted and then reencrypted between two trusted entities did not sit well with many banking institutions and e-commerce vendors
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Due to the security concerns of the WAP gateway (WAP gap) and its legitimate use of a man-in-the-middle attack, full end-to-end security was supported in WAP 20 In the WAP 20 world, the WAP gateway was no longer required and became an optional device Full TLS end-to-end encryption is supported between the mobile device and the web/application server, due to HTTP 1/1 support A WAP gateway could still be used, but for optional supporting purposes such as optimization Its role became more similar to a standard proxy-type device rather than a required translation device With the full end-to-end support of TLS between the mobile device and web/application server, WTLS is no longer needed Figure 9-5 shows an example of TLS connections in the WAP 20 architecture
Figure 9-5
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