Abstract
Abstract Due to costs and performance PC architectures running MSDOS systems (IBM, 1986) are widespread. With the software platform available market is still growing. However from the point of view of security and operating systems concepts this architecture is all but outstanding. Most efforts to improve security have side effects on the compatibility. Starting with a secure state influence on security and integrity can only come from outside. Thus, keeping a computer system safe means control of external data and I/O operations. The presented approach for keeping the system safe in a MSDOS environment is performed by introducing an alternate special file system with security and integrity features. It is based upon a reliable boot procedure as a crucial point in system. As experience with alternate file systems for other purposes exist the approach can be qualified as feasible. As a further side effect of the method presented, unattended periods can be controlled to a remarkable extent.
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