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- #SECURITY THROUGH OBSCURITY PROS AND CONS HOW TO#
- #SECURITY THROUGH OBSCURITY PROS AND CONS DRIVERS#
- #SECURITY THROUGH OBSCURITY PROS AND CONS DRIVER#
- #SECURITY THROUGH OBSCURITY PROS AND CONS SOFTWARE#
- #SECURITY THROUGH OBSCURITY PROS AND CONS PASSWORD#
Problem: Can you trust encryption algorithm?Įxample: one algorithm thought safe had back door When you type in your password, system compares encrypted version System stores only encrypted version, so OK even if someone reads the file! Passwdone way transform(hash)encrypted passwd Mechanism: utilize a transformation that is difficult to reverse without the right key (e.g. What if malicious user gains access to list of passwords? System must keep copy of secret to check against passwords Use of one or more intrinsic physical or behavioral traits to identify someoneĮxamples: fingerprint reader, palm reader, retinal scanġ4.14 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Edition Or can be plugged in directly several credit cards now in this category
#SECURITY THROUGH OBSCURITY PROS AND CONS PASSWORD#
May have display to allow reading of password Since only user knows password, someone types correct password must be user typing itĮlectronics embedded in card capable of providing long passwords or satisfying challenge response queries
#SECURITY THROUGH OBSCURITY PROS AND CONS SOFTWARE#
Instance: run program that erases all of your files Can you trust software to correctly enforce Authentication andġ4.13 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Edition Log in as superuser and youve circumvented authentication Log in as self and can do anything with your resources for Supposed to do Loopholes in any carefully constructed system: If I delete shell, cant log in to fix it! Could make it more difficult by asking: do you really want toĭoesnt help to ask if they want to do it (of course!) Three Pieces to SecurityĪuthentication: who the user actually is Authorization: who is allowed to do what Enforcement: make sure people do only what they are Some examples, to illustrate why providing security is reallyġ4.11 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Editionġ4.12 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Edition
#SECURITY THROUGH OBSCURITY PROS AND CONS HOW TO#
Most well-constructed system cannot protect information ifĬonceptual understanding of how to make systems secure
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Requires consideration of the external environment within Security: use of protection mechanisms to prevent misuse ofĮ.g.: prevent exposure of certain sensitive informationĮ.g.: prevent unauthorized modification/deletion of data Programs, processes, or users to resources Protection: one or more mechanisms for controlling the access of Very large files must read many indirect blocks (four I/Os per blockġ4.8 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Editionġ4.9 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Editionĭiscuss the goals and principles of authentication in a modernĭiscuss the goals and principles of protection in a modernĮxplain how protection domains combined with an access matrixĪre used to specify the resources a process may accessġ4.10 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Edition
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The logical file system is also responsible for protectionġ4.4 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th EditionĬons: External Fragmentation/Hard to grow files Free holes getĬould compact space, but that would be reallyexpensiveġ4.5 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Editionġ4.6 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Editionġ4.7 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Edition Ownership, permissions, and location of the file contents. A file-controlīlock (FCB) contains information about the file, including The actual data (or contents of the files). Metadata includes all of the file-system structure except Logical file system manages metadata information. Logical block addresses to physical block addresses for Logical blocks, as well as physical blocks. Numeric disk address (for example, drive 1, cylinder 73,įile-organization module knows about files and their
#SECURITY THROUGH OBSCURITY PROS AND CONS DRIVER#
Can be thought of as a translator.īasic file system - issue generic commands to theĪppropriate device driver to read and write physical blocks Transfer information between the main memory and theĭisk system.
#SECURITY THROUGH OBSCURITY PROS AND CONS DRIVERS#
I/O control - device drivers and interrupt handlers to 14.2 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Editionġ4.3 Silberschatz, Galvin and Gagne 2008Operating System Concepts 8th Edition