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Revision Date Username Comment
1715 Sep 2015 - 13:43ThomasMisa 
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1022 Jul 2014 - 15:22ThomasMisaAttached file Screen_shot_2014-07-22_at_3.19.50_PM.png 
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S/COMP

 

Secure Communications Processor (SCOMP) was a system, including hardware and a security kernel, developed by Honeywell Information System's Federal Systems Division in order to implement the Multics multilevel security requirements and as a follow-on to the Air Force-Honeywell Multics enhancements known as Project Guardian. SCOMP was a project of Honeywell supported by the Naval Electronics System Command. Parallel efforts in provably secure computer systems were done at UCLA, MITRE, and Ford Aerospace with KSOS.

Honeywell originally intended to develop a security kernel and a software emulator that would run UNIX in a virtual environment. But the impact on system performance and, especially, the concerns about operating-system security were sufficient to warrant developing a new operating system for the SCOMP minicomputer architecture. As a result, the SCOMP security kernel controlled access to system resources, requiring that an application submit a hardware descriptor to the security kernel in order to request access to secured hardware resources. The kernel then permitted or denied that application access to hardware depending upon established permissions for each process. Honeywell advertised that its regular commercial-grade DPS/6 16-bit minicomputer could be transformed into a secure SCOMP machine by swapping out the regular CPU for a secure CPU unit and adding a security-protection module (SPM).(1)(2)

After being in TCSEC evaluation process for two years, SCOMP received TCSEC A1 certification in 1984. It evolved into subsequent secure systems, such as XTS-200, XTS- 400, along with the "Scomp Trusted Operating Program" or STOP series.(3)(4)

Honeywell SCOMP architecture from Fraim, "Scomp: A Solution to the Multilevel Security Problem," Computer (July 1983), 28.
Screen_shot_2014-07-22_at_3.19.50_PM.png

Notes

1 : Lester J. Fraim, "Scomp: A Solution to the Multilevel Security Problem," Computer (July 1983), 26-34.

2 : Trent Jaeger, externalOperating System Security, (Morgan & Claypool, 2008), 77-80.

3 : lock BAE Systems Information Technology, LLC, Common Criteria Evaluation and Validation Report Scheme. XTS-44/STOP 6.1.E. CCEVS-VR-05-0094, Gaithersburg, MD (National Institute of Standards and Technology, March 1, 2005), 5. (Login required)

4 : Lester J. Fraim, "Scomp: A Solution to the Multilevel Security Problem," 26-27, in Computer (July 1983), 26-34. DOI


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Topic revision: r12 - 22 Jul 2014 - 15:31:06 - ThomasMisa
 
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