#3379 Update 0x04g-Testing-Cryptography.md

[sydseter]

This PR closes #3199

Description

Please see discussions under #3199

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[sydseter]

Saw your comment about opening after merging. I’ll keep it closed for now.

[sydseter]

This is currently in draft state awaiting #3199

[cpholguera]

Please pull the latest master and resolve any conflicts. Thanks!

[sydseter]

completly forgot about this one. I'll clean it up now and have a look at the comments on #3379

[Copilot]

Pull Request Overview

This PR updates the cryptography testing documentation to provide more comprehensive guidance on key derivation functions (KDFs) and improper random number generation. The changes expand the existing content with detailed explanations and best practices.

Key Changes:

• Significantly expanded the "Improper Key Derivation Functions" section with detailed explanations of KDF types and use cases
• Added comprehensive guidance on choosing appropriate KDFs for different scenarios (cryptographic vs password storage)
• Enhanced the "Improper Random Number Generation" section with clearer explanations of CSPRNGs

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