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Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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A flashbulb memory is a highly vivid and detailed memory, often linked to events of significant emotional impact. These memories stand out in contrast to everyday memories due to their clarity and the precision with which they are recalled. The strong emotions associated with the event act as a catalyst, ensuring that specific details, such as one's location, actions, and even peripheral elements, are etched into memory with remarkable accuracy. For example, many people can vividly recall...
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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CoMeT: Configurable Tagged Memory Extension.

Jinjae Lee1, Derry Pratama1, Minjae Kim1

  • 1Information Security and AIoT Laboratory, School of Computer Science & Engineering, Pusan National University, Busan 46241, Korea.

Sensors (Basel, Switzerland)
|November 27, 2021
PubMed
Summary
This summary is machine-generated.

CoMeT, a new tagged memory extension, addresses performance and security issues found in existing solutions like ARM MTE. It enhances memory protection by verifying tag values and access permissions, improving security without compromising performance.

Keywords:
memory isolationtagged memory

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Area of Science:

  • Computer Architecture
  • Cybersecurity
  • Systems Security

Background:

  • Processor architectures increasingly offer instruction set extensions for memory vulnerability mitigation.
  • Tagged Memory Extension (TME), including ARM MTE and SPARC ADI, aims to prevent unauthorized memory access using tagged memory.
  • Existing TME solutions exhibit practical performance and security limitations.

Purpose of the Study:

  • To propose CoMeT, a novel instruction set extension for tagged memory.
  • To address the identified performance and security shortcomings of current TME implementations.
  • To enhance memory security by incorporating access permission checks alongside tag matching.

Main Methods:

  • Designed CoMeT as a new instruction set extension for tagged memory.
  • Implemented a prototype of CoMeT on the RISC-V platform.
  • Evaluated CoMeT's effectiveness in implementing security solutions.

Main Results:

  • CoMeT verifies both tag value matching and access permissions for enhanced memory security.
  • The CoMeT prototype was successfully implemented on a RISC-V platform.
  • CoMeT efficiently supports security solutions like shadow stacks and in-process isolation.

Conclusions:

  • CoMeT offers an improved approach to tagged memory security.
  • The proposed extension effectively mitigates performance and security issues in TME.
  • CoMeT enables efficient and secure implementation of critical security solutions.