The Case for Ubiquitous Transport-Level Encryption

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Executive Summary

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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