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PHP Codes to removing duplicate url from one list compared to other list

First i was trying to removing same urls from 2 different urls list and can’t found it so I’m deciding to make it using php to removing urls from List 1 if found on List 2 on the same filename.
With this codes you can make sure that there is no duplicated urls on the other urls list if you need to run multiple urls list on your GSA SER

To make this codes work, you need to identifying first the raw urls using GSA Platform Identified or GSA SER and then putting them to 2 different folder then setup the path

Feel free to modifying or improving this codes

<?php
$ files = glob('D:\GSA\List\GlobalList\*.txt');
$ comparepath = "D:\GSA\List\IndonesiaList";
//$ comparefile = "D:\htdocs\serpresults\betresultsEN.txt";
foreach ($ files as $ key => $ value)
{
    clearstatcache();
    $ i = 0;
    $ file_path = pathinfo($ value);
    $ comparefile = $ comparepath."/".$ file_path['basename'];
    if (file_exists($ comparefile))
    {
        echo "Removing duplicate from ".$ value." and ".$ comparefile." ";
        $ contenta = file($ value);
        $ contentb = file($ comparefile);
        if (!empty($ contenta) && !empty($ contentb))
        {
            foreach ($ contenta as $ keyc => $ cvalue)
            {
                $ grhost = parse_url($ cvalue, PHP_URL_HOST);
                if (!empty($ grhost))
                {
                    if (empty(preg_grep("/\b$ grhost\b/i", $ contentb)))
                    {
                        //$ result = $ grscheme."://".$ grhost;
                        $ cleanurl[] = $ cvalue.PHP_EOL;
                    }
                    else
                    {
                        $ i++;
                    }
                }
            }
            //$ diff = array_diff($ contentb, $ contenta);
            $ cleanfile = fopen($ value, 'r+');
            $ cleanarr = implode($ cleanurl);
            ftruncate($ cleanfile, 0);
            rewind($ cleanfile);
            fwrite($ cleanfile, $ cleanarr);
            fclose($ cleanfile);
            unset($ contenta);
            unset($ contentb);
            unset($ cleanarr);
        }
    }
    echo "Found ".$ i." duplicate on ".$ value."\n";
    unset($ i);
}
?>

Permutation Combinations Mobile Pattern Codes [closed]

Please help write codes to determine 4 to 6 dot patterns. I am stuck after permutations input. It would really help if one could write direct so I could copy paste code to determine list of 4 to 6 dot patterns. Pl refer article.

https://www.guokr.com/article/49408/ I have uploaded jpeg of the error I am facing Code error at =Flatten[{#, Reverse@#} & /@ Partition[{1, 3, 4, 6, 7, 9, 1, 7, 2, 8, 3, 9, 1, 9, 3, 7}, 2], 1]

Which practices should i use while generating SMS codes for auth on my project?

Let’s imagine that we have an SMS verification auth, and using random 4-digit codes, i.e. 1234, 5925, 1342 and etc.

I’m using this random inclusive algorithm on my node.js server:

function getRandomIntInclusive(min, max) {     min = Math.ceil(min);     max = Math.floor(max);     return Math.floor(Math.random() * (max - min + 1) + min); //The maximum is inclusive and the minimum is inclusive  }  const another_one_code = getRandomIntInclusive(1000, 9999); 

taken from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random

Seems i have range from 1000 to 9999 and have some questions about security:

  1. I’m using good algo? Maybe i need to use something better?
  2. Will it increase security if i will check previous sent code for {$ n} last minutes from db and regenerate another one if it will be same (brute same code twice case), so user always gets random 5941-2862-1873-3855-2987 without 1023-1023-2525-2525-3733-3733 case? I understand that chance is low, but anyway…

Thank you for answers!

Dark color on codes problem

I’m reading How to Design Programs using DrRacket.

When I wrote the following codes as

(define (sign x)  (cond  [( > x 0) 1] [( = x 0) 0] [( > x 0) -1])) 

then I get dark color on codes as following

enter image description here

Why did I get it? Can you explain it? Thanks

Note: I’m new here if the tag is false, then can you edit? And can you help with tags?

Is using traditional 2FA codes a pre-requisite for using U2F FIDO key in Dashlane/1Password?

Over the past few weeks, I have spent a lot of time thinking about how to structure my security plan based on a password manager, just two/three strong master passwords and the use of physical U2F keys such as YubiKey. Without going into too much detail, a part of my plan would necessarily include the following:

I have a password manager that stores passwords to all my online accounts (apart from the main email used for registering such accounts). For reasons connected to other parts of my plan:

  • these individual accounts if possible will be secured by the traditional 2FA only, where a 30-second code is generated using a phone app.
  • the manager itself will be secured with a physical U2F key only.

The reasoning behind this was as follows. Consider these two unlikely scenarios:

  1. My master password to the manager and my phone with the 2FA app get stolen. Because the manager can be accessed with the U2F key only, I’m safe.
  2. My master password and the U2F key get stolen. The attacker is able to log into the manager, but because the accounts whose passwords it stores require the 2FA code, I’m safe since the attacker doesn’t have my phone. (They’ll only be able to access the websites that don’t have the 2FA option, but we disregard these as unimportant here).

However, reading Dashlane and 1Password technical support pages, the way I understand them is that to add a key to my manager, I also need to first enable to code-based 2FA (perhaps that’s not the case, but the information was not clearly conveyed). Keeper seems to support U2F without enforcing such 2FA. LastPass does not seem to support U2F in the first place, only OTP.

The reason why I’m worried about this is:

  1. My master password and phone with the 2FA app get stolen. If both 2FA codes and U2F are enabled for the manager, the attacker is now able to get into it (contrary to case 1). Moreover, since the accounts inside it use 2FA, they can also access these accounts (contrary to case 2). Security compromised!

It is therefore crucial to me to use only one type of second-step authentication for my manager. As a related example, despite Google allowing many methods, if you enroll in their Advanced Protection Programme, all other methods apart from the U2F keys are invalidated. I would like the same from my manager. Is this possible in Dashlane or 1Password?

P.S. I am aware of the risks of using only the U2F keys for my manager. However, some managers, e.g. Dashlane, offer one-time recovery codes than could be stored securely somewhere else. One could also take a note of the (usually 32-digit) code associated with the QR picture for enabling the usual 2FA, without actually enabling it at that point.

Linear codes and syndrome

Assume a linear code with (4,2) where we want to encode 2-bit data to 4-bit data. The generator (G) matrix is

1 0 0 0 0 1 1 0 

Now, if we want to encode 00, we get

[0 0] * [1 0 0 0] = [0 0 0 0]         [0 1 1 0] 

Also the parity check matrix (H) matrix is

0 1 1 0 0 0 0 1 

and assume the received data is 0100 where a single bit error occurs on the second bit (from left to right).

Multiplying H.C_received, we get

            [0] [0 1 1 0] * [1]  = [10] [0 0 0 1]   [0]             [0] 

So the syndrome is not zero means there is an error in the received data. BUT, the value of syndrome 10 matches second and third column of the H matrix.

So, how do we find out exactly that the second bit is faulty?

Please explain how backup codes work in TOTP, like google Authenticator

My understanding is that in TOTPs are like HMAC where code is derived from time.

However, I am struggling to understand the concept of Backup Codes in google Authenticator , and how are they calculated as they are not time sensitive and can be used in any sequence . So how google has implemented that? Thanks