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The only widely-used computers with 60-bit words were produced by Control Data Corporation (CDC), [2] including the CDC 6000 series, [3] the CDC 7600, and the CDC Cyber 70 and 170 series. [4] Though the addressable unit was the 60-bit word, instructions were either 15 or 30 bits.
Intel Software Guard Extensions (SGX) is a set of instruction codes implementing trusted execution environment that are built into some Intel central processing units (CPUs). They allow user-level and operating system code to define protected private regions of memory, called enclaves .
Updates the software that the CPU runs on which requires patches to be released for each affected CPU and integrated into every BIOS or operating system OS/VMM Partial: Partial to full: Small to large Applied at the operating system or virtual machine level and (depending on workload) Software recompilation Poor: Partial to full: Medium to large
Today, this high degree of interoperation between the OS and the hardware is not often cost-effective, despite the potential advantages for security and stability. Ultimately, the purpose of distinct operating modes for the CPU is to provide hardware protection against accidental or deliberate corruption of the system environment (and ...
Malicious software can retrieve the data from the (supposedly) secure hardware – a large class of method used is the timing attack. [18] This is far more problematic to solve than a software bug, even within the operating system. Microsoft regularly deals with security issues through Windows Update.
The Open Mobile Terminal Platform (OMTP) first defined TEE in their "Advanced Trusted Environment:OMTP TR1" standard, defining it as a "set of hardware and software components providing facilities necessary to support applications," which had to meet the requirements of one of two defined security levels. The first security level, Profile 1 ...
In computer security, executable-space protection marks memory regions as non-executable, such that an attempt to execute machine code in these regions will cause an exception. It makes use of hardware features such as the NX bit (no-execute bit), or in some cases software emulation of those features. However, technologies that emulate or ...
According to an AMD developer's guide, the subsystem is "responsible for creating, monitoring and maintaining the security environment" and "its functions include managing the boot process, initializing various security related mechanisms, and monitoring the system for any suspicious activity or events and implementing an appropriate response". [2]