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The widening spectrum of applications and services provided by portable andembedded devices bring a new dimension of concerns in security. Most of thoseembedded systems (pay-TV, PDAs, mobile phones, etc...) make use of externalmemory. As a result, the main problem is that data and instructions areconstantly exchanged between memory (RAM) and CPU in clear form on the bus.This memory may contain confidential data like commercial software or privatecontents, which either the end-user or the content provider is willing toprotect. The goal of this paper is to clearly describe the problem ofprocessor-memory bus communications in this regard and the existing techniquesapplied to secure the communication channel through encryption - Performanceoverheads implied by those solutions will be extensively discussed in thispaper.

Hardware Engines for Bus Encryption: A Survey of Existing Techniques