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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca5388 below:

CA5388: Ensure sufficient iteration count when using weak key derivation function (code analysis) - .NET

Iteration count may be smaller than 100,000 when deriving cryptographic key by System.Security.Cryptography.Rfc2898DeriveBytes.GetBytes.

By default, this rule analyzes the entire codebase, but this is configurable.

This rule checks if a cryptographic key was generated by Rfc2898DeriveBytes with an iteration count that may be less than 100,000. A higher iteration count can help mitigate against dictionary attacks that try to guess the generated cryptographic key.

This rule is similar to CA5387, but analysis can't determine if the iteration count is less than 100,000.

Set the iteration count greater than or equal with 100k before calling GetBytes explicitly.

It's safe to suppress warnings from this rule if:

• You need to use a smaller iteration count for compatibility with existing data.
• You're sure that the iteration count is set above 100,000.

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 CA5388
// The code that's violating the rule is on this line.
#pragma warning restore CA5388

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

[*.{cs,vb}]
dotnet_diagnostic.CA5388.severity = none

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

Use the following options to configure which parts of your codebase to run this rule on.

• Exclude specific symbols
• Exclude specific types and their derived types

You can configure these options for just this rule, for all rules they apply to, or for all rules in this category (Security) that they apply to. For more information, see Code quality rule configuration options.

You can exclude specific symbols, such as types and methods, from analysis by setting the excluded_symbol_names option. For example, to specify that the rule should not run on any code within types named MyType, add the following key-value pair to an .editorconfig file in your project:

dotnet_code_quality.CAXXXX.excluded_symbol_names = MyType

Note

Replace the XXXX part of CAXXXX with the ID of the applicable rule.

Allowed symbol name formats in the option value (separated by |):

• Symbol name only (includes all symbols with the name, regardless of the containing type or namespace).
• Fully qualified names in the symbol's documentation ID format. Each symbol name requires a symbol-kind prefix, such as M: for methods, T: for types, and N: for namespaces.
• .ctor for constructors and .cctor for static constructors.

Examples:

You can exclude specific types and their derived types from analysis by setting the excluded_type_names_with_derived_types option. For example, to specify that the rule should not run on any methods within types named MyType and their derived types, add the following key-value pair to an .editorconfig file in your project:

dotnet_code_quality.CAXXXX.excluded_type_names_with_derived_types = MyType

Note

Replace the XXXX part of CAXXXX with the ID of the applicable rule.

Allowed symbol name formats in the option value (separated by |):

• Type name only (includes all types with the name, regardless of the containing type or namespace).
• Fully qualified names in the symbol's documentation ID format, with an optional T: prefix.

Examples:

using System;
using System.Security.Cryptography;

class ExampleClass
{
    public void ExampleMethod(string password, byte[] salt, int cb)
    {
        var iterations = 100;
        Random r = new Random();

        if (r.Next(6) == 4)
        {
            iterations = 100000;
        }

        var rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt, iterations);
        rfc2898DeriveBytes.GetBytes(cb);
    }
}

using System.Security.Cryptography;

class ExampleClass
{
    public void ExampleMethod(string password, byte[] salt, int cb)
    {
        var rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt);
        rfc2898DeriveBytes.IterationCount = 100000;
        rfc2898DeriveBytes.GetBytes(cb);
    }
}

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