Abstract
The first work on email security began in 1984, which resulted in the Privacy Enhanced Mail (PEM) specifications. Two years later, work was done as part of the Secure Data Network System (SDNS) sponsored by the U.S. Government, resulting in the Message Security Protocol (MSP). PEM and MSP both influenced the development of the most popular Internet email security protocol, which is Secure MIME (S/MIME). This article provides insight into the early history of email security, describes ongoing work to improve email security, and then makes some predictions about the future.
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