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Questions tagged [security]

Questions about matters of computer, software and communication security, that is how to protect systems against attacks.

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Matrix to Multi-level security

How to convert access control matrix to Bell-LaPadula. Can teach me step by step What best way to control converting Bell-LaPadula Model lattice using Access Control Matrix Matrix GIVEN $\quad\quad\...
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213 views

How is Chinese Remainder Theorem used in the proof of correctness for RSA

Question At the very end of (most) proofs of RSA's correctness we have something like $$m^{ed}\equiv m\pmod p$$ $$m^{ed}\equiv m\pmod q$$ Therefore by the Chinese Remainder Theorem (CRT) $$m^{ed}\...
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Agreeing on a Time in a Trustless Network

Imagine a chord-like network $N$. each machine $m \in N$ is directly connected to $N_m \subset N$. Without relying on official timeservers, I want all machines to synchronize to some time with ...
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0answers
41 views

How does a vpn connection work?

I have been looking into vpn (virtual private network). And I wanted to know more about the theory, how does it work really: what does it do with the packages? why is it secure? (or why can it be ...
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0answers
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Could an OS relinquish control back to the bootloader?

I'm wondering if it is feasible for an OS to return control back to the bootloader, and boot a second OS after itself. Reason being -- I've been musing on bootkits, and wondering if it would be ...
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64 views

Importance of Needham–Schroeder Protocol

I'm working on a paper about model checking on cryptographic protocols and many of the papers I have read, base their approaches in the Needham-Schroeder protocol. I undestand this was one of the ...
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0answers
90 views

What is an access control graph?

A question I came across describes a scenario of an information system in a clerical office and states- "Identify the sets of S={subjects}, O={objects} and P={privileges} for the above systems of the ...
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204 views

How Can a Network Server Identify a Specific Computer, Is There a Computer Fingerprint?

Most of websites put some restrictions on how to use their services; the following paragraphs are taken from “Terms of Service” of such website: Only one account per computer is allowed to view ads. ...
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How does one guarantee that the commutative, associative and distributive properties hold for a type?

While most main stream programming languages allow for user defined types that can have the following properties: associative commutative distributive the only way I know of that this can be ...
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32 views

How can a usage message or non-trappable key sequence defeat a Trojan horse attack?

I've been reading Chapter 15 of Operating System Concepts 9th Edition. I am stuck understanding this part. A variation of the Trojan horse is a program that emulates a login program. An ...
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16 views

What's the difference between data security and data protection?

The both terminologies seem same but what's the key difference between these two terms. How can you see the difference visually? And one more thing what is security violation ? Are these the steps ...
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22 views

Secrecy rate of eavesdropper channel?

I want to find secrecy rate of a main channel in case of Gaussian broadcast channel. e.g. I have a single transmitter and a receiver where eavesdropper wants to eavesdrop the communication over ...