I tried to get all the products from this website but somehow I don't think I chose the best method because some of them are missing and I can't figure out why. It's not the first time when I get stuck when it comes to this.
Now, the question might be too generic but I wonder if there's a rule of thumb to follow when someone wants to get all the data (products, in this case) from a website. Could someone please walk me through the whole process of discovering what's the best way to approach a scenario like this?
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If your ultimate goal is to scrape the entire product listing for each category, it may make sense to target the full product listings for each category on the index page. This program uses BeautifulSoup to find each category on the index page and then iterates over each product page under each category. The final output is a list of namedtuples stories each category name with the current page link and the full product titles for each link:
I believe the benefit of using BeautifulSoup is this instance is that it provides a higher level of control over the scraping and is easily modified. For instance, should the OP change his mind regarding what facets of the product/index he would like to scrape, simple changes in the find_all parameters should only be needed, as the general structure of the code above centers around each product category from the index page.
First of all, there is no definite answer to your generic question of how would one know if the data one has already scraped is all the available data. This is at least web-site specific and is rarely actually revealed. Plus, the data itself might be highly dynamic. On this web-site though you may more or less use the product counters to verify the amount of results found:
This randomization decreases the chance of the crawler being detected (and subsequently blocked) by sites which analyze requests looking for statistically significant similarities in the time between their requests.
So about a month ago, while I was browsing Google chrome, this sketchy website called aisaver.io randomly opened while I was looking at a pdf. I had never visited this website ever in my life, but was concerned as to why it opened. I did some scans from eset but failed to find anything. About 5 days later, this website opens again and I do some research on the website. On its blogs section, I found some inappropriate content so I was now genuinely scared that there was a malicious application in my computer that was very hidden. After some research. I downloaded malwarebytes and did a scan, and found a like 10 PUPs and 2 trojans. I cleared them and hoped it fixed the issue. A little while later this website opened again, so I did some more research and downloaded the malwarebytes adwcleaner, and deleted like 4 more applications. Unfortunately this didn't seem to fix the issue and the website seems to keep opening again. I looked at when exactly it was opening and its about every 5 days (Last it opened on April 21 so if it opens again on April 26 my guess it correct). My pc has gotten a bit laggier these few days but task manager wasn't any help either. Hopefully I can get some useful info on this and remove this from my pc.
The fix may possibly take up to 60 minutes to complete
If the tool needs a restart please make sure you let the system restart normally and let the tool complete its run after restart.
The tool will make a log named Fixlog.txt in the same folder you ran the Farbar program from. Please attach that log on your next reply.
Important: items are permanently deleted. They are not moved to quarantine. If you have any questions or concerns please ask before running this fix.
Sorry I didn't reply to this earlier, but I got Microsoft office items from an online setup because I wanted the 2021 version of PowerPoint. Will the repair process remove it? I need the 2021 version of PowerPoint for some important presentations.
Hey @AdvancedSetup, thanks for the list of issues, I updated or uninstalled most of the items, but Adobe Creative Cloud seems to be broken, and I can't seem to uninstall or repair it without deleting my other adobe software, that's okay because I don't use Creative Cloud that often and the adobe software that I have will require about 10GB to redownload, but they work fine without Creative Cloud. I also skipped the Java part because I have some projects that I worked on Java which only work with the older versions. I also removed the wondershare applications, but I uninstalled wondershare over 6 months ago so that might have been the issue. But I have searched my computer for some time but I couldn't find the two hidden files, so how do I uninstall them?
Please save the attached FIXLIST.TXT file as before to the Farbar location and then run Farbar and click the FIX and it will remove the hidden flag so that the entries should show in the Control Panel for Remove now.
Random.org provides true random numbers through an unsecured web service. Since these numbers would be transmitted in plaintext could they still be considered useful as true random numbers while maintaining security in a cryptographic solution?
At first I was thinking if a large pool of them was obtained then a small subset of them could be used randomly to make the fact they are known of less use. Then I realized that no matter how many random numbers were obtained this way, it would still be a smaller number set to explore in attempting to crack the cryptography.
That said, these reasons don't necessarily answer the question. They only give insight as to why I personally wouldn't use Random.org for cryptography. Would it be secure to use Random.org in cryptographic solution? Possibly. There really isn't enough information to really know.
It is so easy to create cryptographically-strong random numbers in ways that are known to be strong that adding new methods that add new risks is not advisable. However, if you have an existing method that is known to be secure and has the ability to take in additional sources of randomness in way that cannot do harm even if they are known to an attacker, than go ahead and add them. You have nothing to lose.
In cryptography, randomness is mostly about being unknown to any attacker. Any attacker could observe your download of these random numbers, and now they are not really random since the attacker knows them too.
There is an article from Crypto'97 which describes something which looks like that: it is a secure key exchange system which defeats memory-bounded adversaries. This assume a shared source of randomness which broadcasts random numbers; anybody can listen to it, including any attacker. Two parties who wish to get a shared key record just a few chunks out of the random bits, noting the position of each chunk in the stream (say, the exact emission time). At the end of the day, they send to each other the list of positions; if they recorded enough, there is high probability that there are a few chunks they they both recorded, and they can use these as a shared key. On the other hand, an attacker willing to learn that key would have to record quite a lot of the stream in order to have a fair chance of having all the chunks that the two parties have in common.
This key exchange mechanism is safe as long as the random source broadcasts data at a very high rate, so that recording all of a day's broadcast is not doable. So it should be in gigabytes per second or so.
In a way, using the numbers from random.org is like using this model: you record insecure random numbers, and at the end of the day you assume that you could get some that the attacker failed to record himself. To get a key out of your pool, you could for instance hash the whole of it with a secure hash function such as SHA-256 (don't pick numbers out of the pool; instead, use a hash function, which will not "forget" any entropy). Still, in practice, this fails on several accounts:
The Web in general, and your Internet access in particular, is nowhere near fast enough for this. An attacker can easily record terabytes of data, so you should download much more than that. Your ISP will not be pleased (unless your contract includes a quota, and gigabytes beyond the quota are billed, in which case the ISP will be thrilled).
random.org itself could be an attacker, and feed you what are claimed to be "true random numbers", but are actually the output of a pseudo-random number generator. You would not be able to see the difference. But this would allow the attacker to rebuild the random numbers you got (all of them) at will.
Since you cannot be assured that random.org is not retaining a copy of the number, nor is its transport to you necessarily confidential, you should think of numbers from random.org as public randomness. That is perhaps pessimistic but it will lead you to use such numbers in the correct manner.
A source of public randomness is sometimes called a "beacon." It is an important enough service that NIST is in the progress of creating one. Their whitepaper explains some of its uses and mentions random.org. Another option is to use financial data, which we showed to have sufficient entropy.
We should probably note that while fetching the numbers via secure HTTP would protect them from being observed while in transit, anyone genuinely concerned with security should not trust anyone else (including RANDOM.ORG) to generate their cryptographic keys. 152ee80cbc
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