MagSec/MagSec-Encrypter
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Harden encryption and add key UX improvements

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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
This commit is contained in:
Claude
2026-06-01 10:08:31 +00:00
parent 96becf3607
commit 4744315fdd
2 changed files with 260 additions and 38 deletions
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Form1.Designer.cs
Generated
+45 -4
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@@ -31,6 +31,9 @@ partial class Form1
brandPictureBox = new PictureBox();
keyRailPanel = new GlassPanel();
sideInfoLabel = new Label();
keyStrengthLabel = new Label();
generateKeyButton = new NeonButton();
toggleKeysButton = new NeonButton();
key4TextBox = new TextBox();
key4Label = new Label();
key3TextBox = new TextBox();
@@ -142,6 +145,9 @@ partial class Form1
// keyRailPanel
//
keyRailPanel.Controls.Add(sideInfoLabel);
keyRailPanel.Controls.Add(toggleKeysButton);
keyRailPanel.Controls.Add(generateKeyButton);
keyRailPanel.Controls.Add(keyStrengthLabel);
keyRailPanel.Controls.Add(key4TextBox);
keyRailPanel.Controls.Add(key4Label);
keyRailPanel.Controls.Add(key3TextBox);
@@ -156,15 +162,47 @@ partial class Form1
keyRailPanel.Name = "keyRailPanel";
keyRailPanel.Size = new Size(282, 526);
keyRailPanel.TabIndex = 1;
//
//
// sideInfoLabel
//
//
sideInfoLabel.Font = new Font("Segoe UI", 9F);
sideInfoLabel.Location = new Point(24, 409);
sideInfoLabel.Location = new Point(24, 452);
sideInfoLabel.Name = "sideInfoLabel";
sideInfoLabel.Size = new Size(220, 56);
sideInfoLabel.TabIndex = 10;
sideInfoLabel.TabIndex = 13;
sideInfoLabel.Text = "Use the same key combination for both text and image decryption later.";
//
// keyStrengthLabel
//
keyStrengthLabel.Font = new Font("Segoe UI Semibold", 9F, FontStyle.Bold);
keyStrengthLabel.ForeColor = Color.FromArgb(148, 163, 184);
keyStrengthLabel.Location = new Point(24, 376);
keyStrengthLabel.Name = "keyStrengthLabel";
keyStrengthLabel.Size = new Size(220, 18);
keyStrengthLabel.TabIndex = 10;
keyStrengthLabel.Text = "Strength: —";
//
// generateKeyButton
//
generateKeyButton.ForeColor = Color.FromArgb(245, 248, 255);
generateKeyButton.Location = new Point(24, 402);
generateKeyButton.Name = "generateKeyButton";
generateKeyButton.Size = new Size(104, 38);
generateKeyButton.TabIndex = 11;
generateKeyButton.Text = "Generate";
generateKeyButton.UseVisualStyleBackColor = false;
generateKeyButton.Click += GenerateKeyButton_Click;
//
// toggleKeysButton
//
toggleKeysButton.ForeColor = Color.FromArgb(245, 248, 255);
toggleKeysButton.Location = new Point(140, 402);
toggleKeysButton.Name = "toggleKeysButton";
toggleKeysButton.Size = new Size(104, 38);
toggleKeysButton.TabIndex = 12;
toggleKeysButton.Text = "Show keys";
toggleKeysButton.UseVisualStyleBackColor = false;
toggleKeysButton.Click += ToggleKeysButton_Click;
//
// key4TextBox
//
@@ -564,6 +602,9 @@ partial class Form1
private PictureBox brandPictureBox;
private GlassPanel keyRailPanel;
private Label sideInfoLabel;
private Label keyStrengthLabel;
private NeonButton generateKeyButton;
private NeonButton toggleKeysButton;
private TextBox key4TextBox;
private Label key4Label;
private TextBox key3TextBox;