Tag: verify

how do I verify Green Theorem using mathematic

Verify Green’s Theorem by using Mathematica to evaluate both the line integral and the double integral of the vector field 𝑭(π‘₯, 𝑦) = 𝑦2𝑒π‘₯ π’Š + π‘₯2𝑒𝑦 𝒋 over the curve C consisting of the line segment from (-1,1) to (1,1) followed by the arc of the parabola 𝑦 = 2 βˆ’ π‘₯2 from (1,1) to (-1,1).

Is there a way where we can verify if certain image is 3D or not [closed]

I wanted to understand – Is there a way where we can verify if certain image is 3D or not

So basically I want to automate the process where we can detect if certain given image is of 3D or not

Problem: In my application – I often detect few 3D images are showing as plain black image or sometimes 3D images are broken

So if I can find a way where I can check that certain image should not be completely black and should be 3D model and not 2D image

My Application is in C# – but I am open for any solution irrespective of language!!

Thanks in advance

Shared Verify list on cloud plateform ?

Hello
Feature Request ?

In the same principle that SEO indexing it would be really good if all the verified urls which are currently on all the PCs of all the GSA SER users are accessible via a web platform and downloaded every day. What shares, also receive the list. If we do this, we would eliminate a lot of the problem of proxy, waiting time etc …
But maybe is only a dream… :)

Should I keep running my old projects as Active, Or just Verify

Greetings, friends.
Wondering if I should keep running some of my oldest set of GSA projects as active…and not just set to Verify only…
I mean those oldest projects where I just link to my money site directly with SER.
I don’t think I need to stop running old projects where SER creates links at T2 T3 .. .. just those pointing RIGHT at the  money site.
…and JUST those projects, of course, that I have newer replacements for with my own T1s, either on PBNs, a few legit listings, and various social media and other content platforms, and hopefully some authority links.
Is it ever OK to link directly to a money site with SER?
I have Asia Virtual Solutions active, blog comment, directory, forum, guestbook,Image COntent, Microblog, Pingback, Referrer, RSS, Social Bookmarks, Trackbacks, Web 2.0, Wiki running.
I also have a separate set of older projects that post to anything that will accept an article pointing at the money site. The articles are OK. Spun, hand-written, reviewed spintax for accuracy. On those I have Asia Virtual Solutions (projects to MS that use articles), articles, blog comments, pingbacks,referrers, social bookmarks, social networks, and wikis that use articles when posting.
This is how I chose to set up older projects. Are *either* the first set of projects, or the second that use articles,  appropriate as a T1 pointing at  a money site? And if not, what SHOULD I be using SER-generated backlinks? I’m *SURE* some will suggest SEREngines. I’ve haven’t used SEREngines since the last version, so if someone could explain I would very much appreciate it. Trying to do SEO right, finally. No more continuing poor practices that are just from a time I didn’t know better.
Should I *NOT* have been doing this? Is it considered “spam practices” by Google? At some point, I came to to understand that T1s should be stable and basically be legit. Is it OK?

How to verify PGP signature with signing key using Enigmail in Thunderbird [migrated]

I received an email like this above:

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1  Because anyone can claim to be me. There's no validation of the user name or email address when someone posts a comment. While I do try to remove imposters, some may slip through. By signing my comments using this technique, anyone can independently verify that I was the author of the message by validating the signature. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (MingW32)  iD8DBQFFxqRFCMEe9B/8oqERAqA2AJ91Tx4RziVzY4eR4Ms4MFsKAMqOoQCgg7y6 e5AJIRuLUIUikjNWQIW63QE= =aAhr -----END PGP SIGNATURE-----

And another email with the public key. How can I verify if the signature is valid using the Enigmail in Thunderbird?

C# Isopoh Argon2 Implementation hash does not verify


Summary

  • trying to implement password hashing using Argon2 in C#
  • I have already tried searching, and can’t find this specific issue. Nor does there seem to be a lot of good (easy for me to interpret?) examples for C# Argon2 (please let me know if there is a better way than Isopoh)
  • Using a C# implementation (Isopoh.Cryptography.Argon2) as recommended here
  • I can generate hashes with no issues, passing through various arguments for the Argon2Config
  • I can verify hashes with no issues ONLY IF the hash length is = 32. Anything seems to fail
  • However, I can verify ALL hashes online

This is my first post here so do let me know if I should make any amendments accordingly.

Thanks in advance for any help in resolving this!

Background

I’m testing out different ways of storing encrypted data. I already have a way to encrypt/decrypt data, But I am now looking at ways to implement proper password hashing (and to also use this hashed password as the key for the encryption of the other data – but I will raise this in another thread once I get to that point).

I am developing using VS2019 in a Windows 10 x64 environment. Whilst I’m not new to programming, I am learning C# (from VB.NET), and I’m certainly no expert in Cryptography.

I’m using an implementation of Argon2 that I found recommended in this post to learn how to securely store/hash passwords.

Issue

I can get the hashing process to work (whilst customising the configuration). However, when it comes to verifying the hash, I cannot verify the hash if I use any other hash length apart from 32 – I can play around with the other config settings and it works, but not the hash length.

BUT, where it gets really weird, when I generate a hash that uses a hash length not equal to 32, I verify it using this site, and I get a successful verification

Code

  • I’ve installed the Isopoh.Cryptography packages in the project via NuGet (using v1.1.4)

Namespace:

using System.Security.Cryptography; using Isopoh.Cryptography.Argon2; using Isopoh.Cryptography.SecureArray;

Variable:

private static readonly RandomNumberGenerator Rng = RandomNumberGenerator.Create();

Hashing code:

        string str_ConsoleText;          txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("[START NEW HASH]");         txtConsole.AppendText(Environment.NewLine);         str_ConsoleText = "Starting encryption process";         txtConsole.AppendText(str_ConsoleText);         txtConsole.AppendText(Environment.NewLine);          var stopwatch = Stopwatch.StartNew();          //var password = "password1";         var password = txtPasword.Text;         byte[] passwordBytes = Encoding.UTF8.GetBytes(password);         byte[] salt = new byte[16];                              Rng.GetBytes(salt);          txtSalt.Text = salt.ToString();          var config = new Argon2Config         {             Type = Argon2Type.HybridAddressing,             Version = Argon2Version.Nineteen,             TimeCost = Int32.Parse(txtIterations.Text),             MemoryCost = Int32.Parse(txtMemory.Text) * 1024,             Lanes = Int32.Parse(txtParallelism.Text),             Threads = Int32.Parse(txtThreads.Text),             Password = passwordBytes,             Salt = salt, // >= 8 bytes if not null             //Secret = secret, // from somewhere             //AssociatedData = associatedData, // from somewhere             HashLength = Int32.Parse(txtHashLength.Text) //20 // >= 4         };         var argon2A = new Isopoh.Cryptography.Argon2.Argon2(config);         string hashString;         using (SecureArray<byte> hashA = argon2A.Hash())         {             hashString = config.EncodeString(hashA.Buffer);         }          txtHashResult.Text = hashString;          stopwatch.Stop();          str_ConsoleText = "Encoded hash is: ";         txtConsole.AppendText(str_ConsoleText);         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText(hashString);         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("Details are:");         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("Time cost: " + config.TimeCost.ToString());         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("Memory cost: " + config.MemoryCost.ToString());         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("Lanes: " + config.Lanes.ToString());         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("Threads: " + config.Threads.ToString());         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("Salt: " + config.Salt.ToString());         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("Hash length: " + config.HashLength.ToString());         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText(Environment.NewLine);                  str_ConsoleText = $  "Encryption process took { stopwatch.ElapsedMilliseconds / 1024.0 } s";         txtConsole.AppendText(str_ConsoleText);         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("[END HASH]");

Verifying code:

        var stopwatch = Stopwatch.StartNew();          string str_ConsoleText;          var password = txtPasword.Text;         var passwordHash = txtHashResult.Text;          txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("[START VERIFY HASH]");         txtConsole.AppendText(Environment.NewLine);         str_ConsoleText = "Starting verification process";         txtConsole.AppendText(str_ConsoleText);         txtConsole.AppendText(Environment.NewLine);          txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText(Environment.NewLine);         str_ConsoleText = "[Hash to verify]: ";         txtConsole.AppendText(str_ConsoleText);         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText(passwordHash.ToString());         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText(Environment.NewLine);           if (Isopoh.Cryptography.Argon2.Argon2.Verify(passwordHash, password))         {             // do stuff             str_ConsoleText = "!!!!!!!!!!HASH VERIFICATION SUCCESS!!!!!!!!!!";             txtConsole.AppendText(str_ConsoleText);         }         else         {             str_ConsoleText = "******HASH VERIFICATION FAILED******";             txtConsole.AppendText(str_ConsoleText);         }           stopwatch.Stop();         txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText(Environment.NewLine);         str_ConsoleText = $  "Verification process took { stopwatch.ElapsedMilliseconds / 1024.0 } s";         txtConsole.AppendText(str_ConsoleText);         txtConsole.AppendText(Environment.NewLine);                                 txtConsole.AppendText(Environment.NewLine);         txtConsole.AppendText("[END VERIFY HASH]");

Outputs/Results

Password = Hello World!

Hash length = 32:

[START NEW HASH] Starting encryption process Encoded hash is:  $  argon2id$  v=19$  m=32768,t=4,p=8$  bPsTGKZu/reihfAlLEVlCA$  o79dNC9/toz7CbbFhhkSy4/E2a5pRETd7h+79R7V7iU Details are: Time cost: 4 Memory cost: 32768 Lanes: 8 Threads: 4 Salt: System.Byte[] Hash length: 32  Encryption process took 2.130859375 s [END HASH]  [START VERIFY HASH] Starting verification process      [Hash to verify]:  $  argon2id$  v=19$  m=32768,t=4,p=8$  bPsTGKZu/reihfAlLEVlCA$  o79dNC9/toz7CbbFhhkSy4/E2a5pRETd7h+79R7V7iU  !!!!!!!!!!HASH VERIFICATION SUCCESS!!!!!!!!!!  Verification process took 1.3115234375 s  [END VERIFY HASH]

Argon2.online hash verification:

enter image description here

Hash length = 64:

[START NEW HASH] Starting encryption process Encoded hash is:  $  argon2id$  v=19$  m=32768,t=4,p=8$  h/zEPuZWQsBSAPhZn23gRQ$  6FZzr5DhOMemPTzZ5WY+4MgsxKsxYLNuRbiKo8og+FoYOJFfBsfdCtr1Zs8z6lXVX+E7FUYsGaLA2ZESH6aE0w Details are: Time cost: 4 Memory cost: 32768 Lanes: 8 Threads: 4 Salt: System.Byte[] Hash length: 64  Encryption process took 2.0400390625 s [END HASH]  [START VERIFY HASH] Starting verification process   [Hash to verify]:  $  argon2id$  v=19$  m=32768,t=4,p=8$  h/zEPuZWQsBSAPhZn23gRQ$  6FZzr5DhOMemPTzZ5WY+4MgsxKsxYLNuRbiKo8og+FoYOJFfBsfdCtr1Zs8z6lXVX+E7FUYsGaLA2ZESH6aE0w  ******HASH VERIFICATION FAILED******  Verification process took 1.3076171875 s  [END VERIFY HASH]

Argon2.online hash verification: enter image description here