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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca5373 below:

CA5373: Do not use obsolete key derivation function (code analysis) - .NET

Cryptographically weak key derivation methods System.Security.Cryptography.PasswordDeriveBytes and/or Rfc2898DeriveBytes.CryptDeriveKey are used to generate a key.

This rule detects the invocation of weak key derivation methods System.Security.Cryptography.PasswordDeriveBytes and Rfc2898DeriveBytes.CryptDeriveKey. System.Security.Cryptography.PasswordDeriveBytes used a weak algorithm PBKDF1. Rfc2898DeriveBytes.CryptDeriveKey does not use iteration count and salt from the Rfc2898DeriveBytes object, which makes it weak.

Password-based key derivation should use the PBKDF2 algorithm with SHA-2 hashing. Rfc2898DeriveBytes.GetBytes can be used to achieve that.

Suppress the warning if the risk associated with using PBKDF1 is carefully reviewed and accepted.

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA5373
// The code that's violating the rule is on this line.
#pragma warning restore CA5373

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.CA5373.severity = none

For more information, see How to suppress code analysis warnings.

As of the time of this writing, the following pseudo-code sample illustrates the pattern detected by this rule.

using System;
using System.Security.Cryptography;
class TestClass
{
    public void TestMethod(Rfc2898DeriveBytes rfc2898DeriveBytes, string algname, string alghashname, int keySize, byte[] rgbIV)
    {
        rfc2898DeriveBytes.CryptDeriveKey(algname, alghashname, keySize, rgbIV);
    }
}

using System;
using System.Security.Cryptography;
class TestClass
{
    public void TestMethod(Rfc2898DeriveBytes rfc2898DeriveBytes)
    {
        rfc2898DeriveBytes.GetBytes(1);
    }
}

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