diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..5012f36
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# Shell scripts must stay LF or bash on the CI runner chokes on \r.
+*.sh text eol=lf
diff --git a/.github/scripts/configure-simplysign.ps1 b/.github/scripts/configure-simplysign.ps1
new file mode 100644
index 0000000..7abc4ea
--- /dev/null
+++ b/.github/scripts/configure-simplysign.ps1
@@ -0,0 +1,28 @@
+# Pre-configure SimplySign Desktop for unattended use:
+#  - auto-show the login dialog on launch (so the TOTP keystrokes have a target)
+#  - cache the smart-card PIN in the CSP, so signtool signs without a per-call
+#    PIN prompt, and forget it again when the session disconnects.
+# Mirrors the settings used by the blinkdisk / docuscope CI signing setups.
+
+$ErrorActionPreference = "Stop"
+
+$RegistryPath = "HKCU:\Software\Certum\SimplySign"
+
+$settings = [ordered]@{
+    ShowLoginDialogOnStart             = 1
+    ShowLoginDialogOnAppRequest        = 1
+    RememberLastUserName               = 0
+    Autostart                          = 0
+    UnregisterCertificatesOnDisconnect = 0
+    RememberPINinCSP                   = 1
+    ForgetPINinCSPonDisconnect         = 1
+    LangID                             = 9
+}
+
+Write-Host "=== Configuring SimplySign Desktop registry ==="
+New-Item -Path $RegistryPath -Force | Out-Null
+foreach ($name in $settings.Keys) {
+    Set-ItemProperty -Path $RegistryPath -Name $name -Value $settings[$name] -Type DWord
+    Write-Host "  $name = $($settings[$name])"
+}
+Write-Host "Done."
diff --git a/.github/scripts/connect-simplysign.ps1 b/.github/scripts/connect-simplysign.ps1
new file mode 100644
index 0000000..2d312ed
--- /dev/null
+++ b/.github/scripts/connect-simplysign.ps1
@@ -0,0 +1,245 @@
+# Authenticate SimplySign Desktop non-interactively.
+#
+# Certum's SimplySign cloud has no headless login: the certificate only reaches
+# the Windows store after the GUI client authenticates. So we generate the
+# current TOTP from the otpauth:// secret (CERTUM_OTP_URI) and paste the
+# credentials into the login dialog. This needs an interactive desktop session,
+# which GitHub-hosted Windows runners provide.
+#
+# Based on https://www.devas.life/how-to-automate-signing-your-windows-app-with-certum/
+# and the refinements in blinkdisk's connect-simplysign.ps1.
+
+param(
+    [string]$OtpUri  = $env:CERTUM_OTP_URI,
+    [string]$UserId  = $env:CERTUM_USERID,
+    [string]$ExePath = $env:CERTUM_EXE_PATH
+)
+
+if (-not $OtpUri) { Write-Host "ERROR: CERTUM_OTP_URI not provided"; exit 1 }
+if (-not $UserId) { Write-Host "ERROR: CERTUM_USERID not provided"; exit 1 }
+if (-not $ExePath) {
+    $ExePath = "C:\Program Files\Certum\SimplySign Desktop\SimplySignDesktop.exe"
+}
+
+Write-Host "=== SimplySign Desktop TOTP authentication ==="
+if (-not (Test-Path $ExePath)) {
+    Write-Host "ERROR: SimplySign Desktop not found at $ExePath"
+    exit 1
+}
+
+# --- Parse the otpauth:// URI (works on PowerShell 5.1 and 7+) ---------------
+$uri = [Uri]$OtpUri
+try {
+    $q = [System.Web.HttpUtility]::ParseQueryString($uri.Query)
+} catch {
+    $q = @{}
+    foreach ($part in $uri.Query.TrimStart('?') -split '&') {
+        $kv = $part -split '=', 2
+        if ($kv.Count -eq 2) { $q[$kv[0]] = [Uri]::UnescapeDataString($kv[1]) }
+    }
+}
+
+$Base32    = $q['secret']
+$Digits    = if ($q['digits'])    { [int]$q['digits'] }    else { 6 }
+$Period    = if ($q['period'])    { [int]$q['period'] }    else { 30 }
+$Algorithm = if ($q['algorithm']) { $q['algorithm'].ToUpper() } else { 'SHA256' }
+
+if (-not $Base32) { Write-Host "ERROR: otpauth URI has no 'secret'"; exit 1 }
+if ($Algorithm -notin @('SHA1', 'SHA256', 'SHA512')) {
+    Write-Host "ERROR: unsupported TOTP algorithm: $Algorithm"
+    exit 1
+}
+
+# --- TOTP generator (RFC 6238), inline C# so there are no dependencies --------
+Add-Type -Language CSharp @"
+using System;
+using System.Security.Cryptography;
+
+public static class Totp
+{
+    private const string B32 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+
+    private static byte[] Base32Decode(string s)
+    {
+        s = s.TrimEnd('=').ToUpperInvariant();
+        byte[] bytes = new byte[s.Length * 5 / 8];
+        int bitBuffer = 0, bitsLeft = 0, idx = 0;
+        foreach (char c in s)
+        {
+            int val = B32.IndexOf(c);
+            if (val < 0) throw new ArgumentException("Invalid Base32 char: " + c);
+            bitBuffer = (bitBuffer << 5) | val;
+            bitsLeft += 5;
+            if (bitsLeft >= 8) { bytes[idx++] = (byte)(bitBuffer >> (bitsLeft - 8)); bitsLeft -= 8; }
+        }
+        return bytes;
+    }
+
+    private static HMAC Hmac(string algorithm, byte[] key)
+    {
+        switch (algorithm.ToUpper())
+        {
+            case "SHA1":   return new HMACSHA1(key);
+            case "SHA256": return new HMACSHA256(key);
+            case "SHA512": return new HMACSHA512(key);
+            default: throw new ArgumentException("Unsupported algorithm: " + algorithm);
+        }
+    }
+
+    public static string Now(string secret, int digits, int period, string algorithm)
+    {
+        byte[] key = Base32Decode(secret);
+        long counter = DateTimeOffset.UtcNow.ToUnixTimeSeconds() / period;
+        byte[] cnt = BitConverter.GetBytes(counter);
+        if (BitConverter.IsLittleEndian) Array.Reverse(cnt);
+
+        byte[] hash;
+        using (var h = Hmac(algorithm, key)) { hash = h.ComputeHash(cnt); }
+
+        int offset = hash[hash.Length - 1] & 0x0F;
+        int binary =
+            ((hash[offset]     & 0x7F) << 24) |
+            ((hash[offset + 1] & 0xFF) << 16) |
+            ((hash[offset + 2] & 0xFF) << 8)  |
+             (hash[offset + 3] & 0xFF);
+        int otp = binary % (int)Math.Pow(10, digits);
+        return otp.ToString(new string('0', digits));
+    }
+}
+"@
+
+function Find-UiByName($el, $walker, $name) {
+    $c = $walker.GetFirstChild($el)
+    while ($c) {
+        if ($c.Current.Name -eq $name) { return $c }
+        $r = Find-UiByName $c $walker $name
+        if ($r) { return $r }
+        $c = $walker.GetNextSibling($c)
+    }
+    return $null
+}
+
+# An outdated SimplySign build pops a modal "New version found - download?" box
+# over the login form, which swallows the credential keystrokes. Decline it by
+# clicking "No" (Invoke / legacy default action / click the element's point).
+function Dismiss-UpdatePrompt {
+    try { Add-Type -AssemblyName UIAutomationClient, UIAutomationTypes -ErrorAction Stop } catch { return $false }
+    if (-not ('Win32Mouse' -as [type])) {
+        Add-Type @"
+using System;
+using System.Runtime.InteropServices;
+public static class Win32Mouse {
+    [DllImport("user32.dll")] static extern bool SetCursorPos(int x, int y);
+    [DllImport("user32.dll")] static extern void mouse_event(uint f, uint x, uint y, uint d, int e);
+    public static void Click(int x, int y){ SetCursorPos(x,y); mouse_event(0x02,0,0,0,0); mouse_event(0x04,0,0,0,0); }
+}
+"@
+    }
+    $procIds = @((Get-Process -Name '*SimplySign*' -ErrorAction SilentlyContinue).Id)
+    $walker = [System.Windows.Automation.TreeWalker]::ControlViewWalker
+    $top = $walker.GetFirstChild([System.Windows.Automation.AutomationElement]::RootElement)
+    while ($top) {
+        if ($procIds -contains $top.Current.ProcessId) {
+            $no = Find-UiByName $top $walker "No"
+            if ($no) {
+                Write-Host "Update prompt detected; declining (clicking 'No')."
+                try { ($no.GetCurrentPattern([System.Windows.Automation.InvokePattern]::Pattern)).Invoke(); return $true } catch {}
+                try { ($no.GetCurrentPattern([System.Windows.Automation.LegacyIAccessiblePattern]::Pattern)).DoDefaultAction(); return $true } catch {}
+                try { $pt = $no.GetClickablePoint(); [Win32Mouse]::Click([int]$pt.X, [int]$pt.Y); return $true } catch { Write-Host "Click 'No' failed: $($_.Exception.Message)" }
+            }
+        }
+        $top = $walker.GetNextSibling($top)
+    }
+    return $false
+}
+
+# Start from a clean slate so a stale window/session can't swallow the keystrokes.
+if ($existing = Get-Process -Name "SimplySignDesktop" -ErrorAction Ignore) {
+    Write-Host "Killing existing SimplySignDesktop process..."
+    $existing | Stop-Process -Force
+    Start-Sleep -Seconds 1
+}
+
+Write-Host "Launching SimplySign Desktop..."
+$proc = Start-Process -FilePath $ExePath -PassThru
+Start-Sleep -Seconds 3
+
+$wshell = New-Object -ComObject WScript.Shell
+
+Write-Host "Focusing the login window..."
+$focused = $wshell.AppActivate($proc.Id)
+if (-not $focused) { $focused = $wshell.AppActivate('SimplySign Desktop') }
+for ($i = 0; (-not $focused) -and ($i -lt 10); $i++) {
+    Start-Sleep -Milliseconds 500
+    $focused = $wshell.AppActivate($proc.Id) -or $wshell.AppActivate('SimplySign Desktop')
+}
+if (-not $focused) {
+    Write-Host "ERROR: could not bring SimplySign Desktop to the foreground"
+    exit 1
+}
+
+# Decline the "new version available" modal if it's covering the login form.
+if (Dismiss-UpdatePrompt) { Start-Sleep -Milliseconds 800 }
+
+# Re-assert focus: dismissing the dialog can move the foreground window, and
+# keystrokes sent to the wrong window are silently dropped.
+$wshell.AppActivate($proc.Id) | Out-Null
+$wshell.AppActivate('SimplySign Desktop') | Out-Null
+Start-Sleep -Milliseconds 400
+
+# Paste rather than type: SendKeys mangles characters like + ^ % ( ) and can
+# drop characters; pasting delivers the exact string. Falls back to typing if
+# the clipboard is unavailable.
+function Set-Field([string]$text) {
+    try {
+        Set-Clipboard -Value $text -ErrorAction Stop
+        Start-Sleep -Milliseconds 150
+        $wshell.SendKeys("^v")
+    } catch {
+        Write-Host "Clipboard unavailable ($($_.Exception.Message)); typing instead."
+        $wshell.SendKeys($text)
+    }
+    Start-Sleep -Milliseconds 250
+}
+
+Write-Host "Injecting credentials..."
+Set-Field $UserId
+$wshell.SendKeys("{TAB}")
+Start-Sleep -Milliseconds 200
+
+# Generate the code right before sending it so it can't expire while we focus.
+$otp = [Totp]::Now($Base32, $Digits, $Period, $Algorithm)
+Set-Field $otp
+Start-Sleep -Milliseconds 200
+$wshell.SendKeys("{ENTER}")
+
+# Don't leave the OTP / username sitting on the clipboard afterwards.
+try { Set-Clipboard -Value " " -ErrorAction Stop } catch {}
+
+Write-Host "Waiting for authentication to settle..."
+Start-Sleep -Seconds 5
+
+if (-not (Get-Process -Id $proc.Id -ErrorAction SilentlyContinue)) {
+    Write-Host "ERROR: SimplySign Desktop exited - authentication failed."
+    exit 1
+}
+
+# Confirm the login actually mounted the signing certificate into the store.
+$thumb = if ($env:CERTUM_CERT_SHA1) { ($env:CERTUM_CERT_SHA1 -replace '\s', '').ToUpperInvariant() } else { $null }
+Write-Host "Verifying the signing certificate reached the store..."
+$deadline = (Get-Date).AddSeconds(60)
+$found = $false
+do {
+    $certs = Get-ChildItem Cert:\CurrentUser\My, Cert:\LocalMachine\My -ErrorAction SilentlyContinue
+    if ($thumb) { $found = [bool]($certs | Where-Object { $_.Thumbprint -eq $thumb }) }
+    else        { $found = [bool]($certs | Where-Object { $_.Subject -like '*Certum*' -or $_.Issuer -like '*Certum*' }) }
+    if ($found) { break }
+    Start-Sleep -Seconds 3
+} while ((Get-Date) -lt $deadline)
+
+if ($found) {
+    Write-Host "=== Authentication complete: signing certificate is available. ==="
+} else {
+    Write-Host "ERROR: signing certificate did not appear after authentication."
+    exit 1
+}
diff --git a/.github/scripts/install-simplysign.sh b/.github/scripts/install-simplysign.sh
new file mode 100644
index 0000000..6e4f30a
--- /dev/null
+++ b/.github/scripts/install-simplysign.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+# Install Certum SimplySign Desktop on the (ephemeral) Windows runner.
+# SimplySign Desktop is what mounts the cloud signing certificate as a virtual
+# smart card into the Windows certificate store; signtool then selects it by
+# thumbprint. The version + checksum are pinned for reproducibility.
+
+set -euo pipefail
+
+VERSION="9.3.4.72"
+URL="https://files.certum.eu/software/SimplySignDesktop/Windows/${VERSION}/SimplySignDesktop-${VERSION}-64-bit-en.msi"
+EXPECTED_SHA256="bd51ebbaaac20fc7d59ab7103b5ed532b7800586df4e31f6999d03a394f9c515"
+INSTALLER="SimplySignDesktop.msi"
+INSTALL_DIR="/c/Program Files/Certum/SimplySign Desktop"
+
+echo "=== Installing Certum SimplySign Desktop ${VERSION} ==="
+
+# Idempotent: a cached/pre-provisioned image may already have it.
+if [ -d "$INSTALL_DIR" ]; then
+  echo "Already installed at: $INSTALL_DIR"
+  exit 0
+fi
+
+echo "Downloading installer..."
+curl -L "$URL" -o "$INSTALLER" --fail --max-time 600
+
+ACTUAL_SHA256=$(sha256sum "$INSTALLER" | awk '{print $1}')
+if [ "$EXPECTED_SHA256" != "$ACTUAL_SHA256" ]; then
+  echo "ERROR: checksum mismatch"
+  echo "  expected: $EXPECTED_SHA256"
+  echo "  actual:   $ACTUAL_SHA256"
+  exit 1
+fi
+echo "Checksum verified."
+
+echo "Running msiexec (silent)..."
+# Start-Process inherits this CWD, so the relative installer path resolves here.
+powershell -Command "Start-Process msiexec.exe -ArgumentList '/i','${INSTALLER}','/quiet','/norestart','/l*v','install.log','ALLUSERS=1','REBOOT=ReallySuppress' -Wait -NoNewWindow"
+
+if [ ! -d "$INSTALL_DIR" ]; then
+  echo "ERROR: installation directory not found after install"
+  echo "Last 20 lines of install.log:"
+  tail -20 install.log 2>/dev/null || echo "(no install.log)"
+  exit 1
+fi
+
+echo "SimplySign Desktop installed."
diff --git a/.github/scripts/sign-certum.ps1 b/.github/scripts/sign-certum.ps1
new file mode 100644
index 0000000..7f679f2
--- /dev/null
+++ b/.github/scripts/sign-certum.ps1
@@ -0,0 +1,66 @@
+# Sign the given files with the Certum cloud certificate (selected by SHA1
+# thumbprint from the store) and verify each signature. Assumes SimplySign
+# Desktop has already authenticated (connect-simplysign.ps1).
+
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory = $true)]
+    [string[]]$Files,
+    [string]$CertSha1     = $env:CERTUM_CERT_SHA1,
+    [string]$TimestampUrl = "http://time.certum.pl"
+)
+
+$ErrorActionPreference = "Stop"
+
+if (-not $CertSha1) { throw "CERTUM_CERT_SHA1 not provided." }
+$thumb = ($CertSha1 -replace '\s', '').ToUpperInvariant()
+
+# Resolve the newest signtool.exe from the installed Windows SDK(s).
+$kitsBin = "C:\Program Files (x86)\Windows Kits\10\bin"
+$signtool = Get-ChildItem -Path $kitsBin -Recurse -Filter signtool.exe -File -ErrorAction SilentlyContinue |
+    Where-Object { $_.FullName -like '*\x64\*' } |
+    Sort-Object { [version]$_.Directory.Parent.Name } |
+    Select-Object -Last 1 -ExpandProperty FullName
+if (-not $signtool) { throw "signtool.exe not found under $kitsBin" }
+Write-Host "Using signtool: $signtool"
+
+# The SimplySign virtual smart card registers in the store a moment after the
+# desktop client authenticates; poll for our certificate before signing.
+Write-Host "Waiting for certificate $thumb to appear in the store..."
+$deadline = (Get-Date).AddSeconds(120)
+$cert = $null
+$elapsed = 0
+do {
+    $cert = Get-ChildItem Cert:\CurrentUser\My, Cert:\LocalMachine\My -ErrorAction SilentlyContinue |
+        Where-Object { $_.Thumbprint -eq $thumb } | Select-Object -First 1
+    if ($cert) { break }
+    Start-Sleep -Seconds 3
+    $elapsed += 3
+    Write-Host "  ...still waiting (${elapsed}s)"
+} while ((Get-Date) -lt $deadline)
+
+if (-not $cert) {
+    Write-Host "Certificate not found. CurrentUser\My + LocalMachine\My contents:"
+    Get-ChildItem Cert:\CurrentUser\My, Cert:\LocalMachine\My -ErrorAction SilentlyContinue |
+        Select-Object Thumbprint, Subject, HasPrivateKey | Format-Table -AutoSize | Out-String | Write-Host
+    Write-Host "SimplySign processes:"
+    Get-Process -Name '*SimplySign*' -ErrorAction SilentlyContinue |
+        Select-Object Name, Id, Responding, MainWindowTitle | Format-Table -AutoSize | Out-String | Write-Host
+    throw "Certificate $thumb not found in the store - SimplySign authentication likely failed (see dump above)."
+}
+Write-Host "Found signing certificate: $($cert.Subject)"
+
+$failed = @()
+foreach ($file in $Files) {
+    if (-not (Test-Path $file)) { throw "File to sign not found: $file" }
+    Write-Host "=== Signing $file ==="
+    & $signtool sign /sha1 $thumb /fd sha256 /td sha256 /tr $TimestampUrl /v $file
+    if ($LASTEXITCODE -ne 0) { $failed += $file; continue }
+    & $signtool verify /pa /v $file
+    if ($LASTEXITCODE -ne 0) { $failed += $file }
+}
+
+if ($failed.Count -gt 0) {
+    throw "Signing/verification failed for: $($failed -join ', ')"
+}
+Write-Host "All binaries signed and verified."
diff --git a/.github/workflows/cd.yaml b/.github/workflows/cd.yaml
index 1253427..0387c08 100644
--- a/.github/workflows/cd.yaml
+++ b/.github/workflows/cd.yaml
@@ -16,9 +16,15 @@ jobs:
 
     runs-on: windows-2025-vs2026
 
+    permissions:
+      contents: write
+
     env:
       Configuration: Release
       Actions_Allow_Unsecure_Commands: true
+      CERTUM_OTP_URI: ${{ secrets.CERTUM_OTP_URI }}
+      CERTUM_USERID: ${{ secrets.CERTUM_USERID }}
+      CERTUM_CERT_SHA1: ${{ secrets.CERTUM_CERT_SHA1 }}
 
     steps:
     - name: Checkout
@@ -46,7 +52,28 @@ jobs:
 
     - name: Build binaries
       run: cmake --build build --config Release
-    
+
+    # Signing only runs when the Certum secrets are present (i.e. on the real
+    # repo, not forks); without them the build still produces unsigned binaries.
+    - name: Set up Certum SimplySign
+      if: env.CERTUM_OTP_URI != ''
+      shell: bash
+      run: |
+        chmod +x ./.github/scripts/install-simplysign.sh
+        ./.github/scripts/install-simplysign.sh
+        powershell -ExecutionPolicy Bypass -File "./.github/scripts/configure-simplysign.ps1"
+
+    - name: Authenticate Certum SimplySign
+      if: env.CERTUM_OTP_URI != ''
+      shell: bash
+      run: powershell -ExecutionPolicy Bypass -File "./.github/scripts/connect-simplysign.ps1"
+
+    - name: Sign release binaries
+      if: env.CERTUM_OTP_URI != ''
+      shell: pwsh
+      run: |
+        ./.github/scripts/sign-certum.ps1 -Files @(".\bin\Release\gMod.dll", ".\bin\Release\TpfConvert.exe")
+
     - name: Retrieve version
       id: set_version
       run: |
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c0c21eb..78b3511 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,9 +10,9 @@ if(NOT(CMAKE_SIZEOF_VOID_P EQUAL 4))
 endif()
 
 set(VERSION_MAJOR 1)
-set(VERSION_MINOR 9)
+set(VERSION_MINOR 10)
 set(VERSION_PATCH 0)
-set(VERSION_TWEAK 3)
+set(VERSION_TWEAK 0)
 
 set(VERSION_RC "${CMAKE_CURRENT_BINARY_DIR}/version.rc")
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/version.rc.in" "${VERSION_RC}" @ONLY)