Claude 4744315fdd Harden encryption and add key UX improvements ...

Security:
- Versioned, self-describing payload format (v2) that stores KDF
  parameters, enabling future crypto agility
- Upgrade key derivation to PBKDF2-HMAC-SHA512 at 600k iterations
  (was SHA256 at 200k)
- Bind the full header (prefix, version, KDF params, salt, nonce)
  into the AES-GCM tag as associated data so header tampering is detected
- Zero derived keys and secret bytes from memory after use
- Enforce a minimum combined key length
- Keep backwards-compatible decryption for legacy v1 payloads

UX:
- Add a Generate button that creates a strong random key with a
  transcription-friendly alphabet
- Add a Show/Hide keys toggle
- Add a live key-strength indicator
- Replace leftover Dutch file-dialog strings with English

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bin

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obj

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.gitattributes

Initial commit

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Form1.cs

Harden encryption and add key UX improvements

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Form1.Designer.cs

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magsec_logo_transparent.png

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magsec_logo.ico

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magsec_logo.jpg

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NuGet.Config

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Program.cs

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TextEncryptorApp.csproj

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TextEncryptorApp.csproj.user

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