diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d71c8d6..951644a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,9 +13,15 @@ jobs:
       uses: subosito/flutter-action@main
     - name: Build
       run: |
+        $length = 128
+        $characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'.ToCharArray()
+        $randomString = -join ((1..$length) | ForEach-Object { $characters | Get-Random })
+
         $cert = New-SelfSignedCertificate -Type CodeSigning -Subject "CN=TaYaKi71751" -CertStoreLocation "Cert:\CurrentUser\My"
-        $password = ConvertTo-SecureString -String "TaYaKi71751" -Force -AsPlainText
+        $password = ConvertTo-SecureString -String "$randomString" -Force -AsPlainText
         Export-PfxCertificate -Cert $cert -FilePath "key.pfx" -Password $password
+        openssl pkcs12 -in key.pfx -clcerts -nokeys -out key.cer -passout pass:$randomString
+
 
         flutter build windows
         flutter pub run msix:create --certificate-path key.pfx --certificate-password $randomString --install-certificate false
@@ -26,6 +32,7 @@ jobs:
         path: |
           build\windows\x64\runner\Release\*
           key.pfx
+          key.cer
     
   # https://github.com/AppImageCrafters/appimage-builder-flutter-example/blob/main/.github/workflows/appimage.yml
   linux-build: