diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index c7d645e..1fc8261 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -36,7 +36,9 @@ jobs:
       - name: Deploy via SCP
         run: |
           mkdir -p ~/.ssh
-          echo "${{ secrets.SSH_PRIVATE_KEY }}" | tr -d '\r' > ~/.ssh/deploy_key
+          printf '%s' "${{ secrets.SSH_PRIVATE_KEY }}" | tr -d '\r' > ~/.ssh/deploy_key
           chmod 600 ~/.ssh/deploy_key
+          echo "=== key validation ==="
+          ssh-keygen -l -f ~/.ssh/deploy_key || echo "KEY INVALID"
           ssh-keyscan -p ${{ secrets.SSH_PORT }} -H ${{ secrets.SSH_HOST }} >> ~/.ssh/known_hosts
           scp -P ${{ secrets.SSH_PORT }} -i ~/.ssh/deploy_key -o IdentitiesOnly=yes -r dist/* root@${{ secrets.SSH_HOST }}:/var/www/proto.bodalab.diffthink.kr/