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What techniques can be applied to detect Polymorphic and Metamorphic viruses?
How difficult is to implement these techniques?
Are these techniques being applied in modern day anti-virus softwares?
I thought most of the virus scanners nowadays use sandbox techniques to check for "bad" behavior. Therefore the polymorphic virusses will also be detected.
of course these detection techniques are also known to virus creators, and can easily be bypassed using a bunch of random, unharmfull, code executions before the actual payload.
It's impossiable to detect all known poly/metamorphic bad-code. White lists verification is the only provable technique. It's not always possiable, especially if your infrastructure/computer has not been maintainedd very well. Which is a good reason why signature, heuristic, emulation based detection is still valuable.
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I want to go with Xamarin.Forms project. Now, I am bit confuse for consuming Rest API for this project. Performance matters.
There are many available but can any body please suggest me which should be best for Xamarin.Forms(.Net Standard)?
Microsoft Http Libraries or third party libraries like Refit, RESTSharp, PortableRest, etc.
Please suggest
All of these options are viable. I think the performance differences between these libraries will be marginal. So, it mostly comes down to what you feel comfortable with.
I like to use Refit because it will take a lot of redundant code out of your hands and you just have to focus on the contract. All the code for the actual calls is generated at compile-time (and thus won't impact your performance at runtime).
Also have a look at how well the library is maintained and if it's active. If you choose one that is already inactive for a while, chances are that you will start relying on older software versions which might not be what you want.
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I faced a task when I need to process a bunch of conditions and perform an action in the result. Are there any libraries or approaches that can help me building a structure like this? With replaceable/amendable conditions and results?
There are several patterns here, you can use Chain Of Responsibility to extract out the logic into separate classes.
If you want to fully extract it, there are rules engines that can help with that, making the if/else more data-driven. This has it's own concerns, namely around testing, promotion, etc...
Feel free to peruse my rant against rules engines: Method or pattern to implement a Business Rules Engine in a solution?
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I know this as been asked but couldn't find an answer that I understand...
Some people told me about the main thing are sagas, but it doesn't look such a big advantage to make me spend my bucks on NServiceBus when I already have MSMQ....
That's a little bit like asking "why do I need ASP.NET MVC when I already have HTTP?"... a little tongue-in-cheek, but still with a lot of truth in it.
NServiceBus gives you message serialization, a sensible threading model, routing, and several ready-to-use messaging patterns out of the box.
MSMQ gives you... message queues! And a fairly complicated API with many low level options that give you no real pit of succes...
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I have tried manual detection using LS polynomial fitting here. But that cannot be used in my project as mine has to be a fully automated system.
Take a look at the Scale-Invariant Feature Transform, or SIFT. This video explains it well. You "train" a detector with one or more images of eyelids, and the detector locates similar regions in the input images. It's the de facto general purpose feature detector - although more specialized tools like face detectors are faster.
The "Scale-Invariant" part means that it can detect the same object at different sizes and rotations.
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What is the difference between terms: "obsolete code" and "waste code"?
If there is the difference, what approaches are eligible for its reduction?
Obsolete code:
Code that may have been useful in the past, but is no longer used, e.g. code to use a deprecated protocol.
Waste code:
Never heard of the term, but I'd imagine - code that may or may not be executed that can be removed without changing workings of the application. I'd imagine this would include obsolete code.
Either of the above can range from single statements to entire libraries.
Personally I would say that obsolete code are methods that are there, but aren't used any more. Like for example deprecated methods/functions. Waste code would I define as code that has as only function to slow the application down.