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Today, Internet traffic is encrypted only when deemed necessary. Yet modern CPUs could feasibly encrypt most traffic. Moreover, the cost of doing so will only drop over time. TCP-Crypt is a TCP extension designed to make end-to-end encryption of TCP traffic the default, not the exception. To facilitate adoption TCP-Crypt provides backwards compatibility with legacy TCP stacks and middle boxes. Because it is implemented in the transport layer, it protects legacy applications. However, it also provides a hook for integration with application-layer authentication, largely obviating the need for applications to encrypt their own network traffic and minimizing the need for duplication of functionality.
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