diff --git a/buildall.sh b/buildall.sh
index 385260e..db9630f 100755
--- a/buildall.sh
+++ b/buildall.sh
@@ -10,9 +10,9 @@ PROJECT=${HOME}/paperless-server/\${BUILD_TAG}
 PREFIX=${HOME}/paperless-server/\${BUILD_TAG}
 TMPDIR=${TMPDIR:-/tmp}/paperless-server/${USER}/\${BUILD_TAG}
 
-PAPERLESS_SECRET_KEY=$(head -c 64 < /dev/urandom | openssl base64 |head -1)
+PAPERLESS_SECRET_KEY=$(</dev/urandom tr -dc '[:lower:][:upper:][:digit:]' | head -c64)
 PAPERLESS_ADMIN_USER=admin
-PAPERLESS_ADMIN_PASSWORD=$(head -c 12 < /dev/urandom | openssl base64 |head -1)
+PAPERLESS_ADMIN_PASSWORD=$(</dev/urandom tr -dc '[:lower:][:upper:][:digit:]' | head -c12)
 PAPERLESS_ADMIN_MAIL=admin@localhost.
 
 PAPERLESS_BIND_ADDR=127.0.0.1
diff --git a/paperless-ngx.build.sh b/paperless-ngx.build.sh
index cca4a1a..a760572 100755
--- a/paperless-ngx.build.sh
+++ b/paperless-ngx.build.sh
@@ -95,7 +95,7 @@ uv pip install --system --no-python-downloads --python-preference system --requi
 ./manage.py migrate
 
 PAPERLESS_ADMIN_USER=${PAPERLESS_ADMIN_USER:-admin}
-PAPERLESS_ADMIN_PASSWORD=${PAPERLESS_ADMIN_PASSWORD:-$( head -c 64 /dev/urandom | openssl base64 |head -1)}
+PAPERLESS_ADMIN_PASSWORD=${PAPERLESS_ADMIN_PASSWORD:-$(</dev/urandom tr -dc '[:lower:][:upper:][:digit:]' | head -c64)}
 PAPERLESS_ADMIN_MAIL=${PAPERLESS_ADMIN_MAIL:-admin@localhost.lan}
 
 ./manage.py shell -c "from django.contrib.auth.models import User; User.objects.create_superuser('${PAPERLESS_ADMIN_USER}', '${PAPERLESS_ADMIN_MAIL}', '${PAPERLESS_ADMIN_PASSWORD}')" || true
diff --git a/paperless.conf.build.sh b/paperless.conf.build.sh
index 653feb2..eaa9d9a 100755
--- a/paperless.conf.build.sh
+++ b/paperless.conf.build.sh
@@ -12,7 +12,7 @@ PREFIX=${PROJECT}/paperless-ngx
 TO=${PREFIX}/paperless.conf
 
 # random key
-PAPERLESS_SECRET_KEY=${PAPERLESS_SECRET_KEY:-$(cat /dev/urandom | head -c 50 | openssl base64 |head -1)}
+PAPERLESS_SECRET_KEY=${PAPERLESS_SECRET_KEY:-$(</dev/urandom tr -dc '[:lower:][:upper:][:digit:]' | head -c50)}
 
 # paperless.conf aus paperles.conf.example hart generieren
 _conf=(