diff --git a/.env.example b/.env.example
index f9ddba801..a1faef3f0 100644
--- a/.env.example
+++ b/.env.example
@@ -19,6 +19,7 @@ NEXTAUTH_URL='http://localhost:3000'
 # SIGNING
 CERT_FILE_PATH=
 CERT_PASSPHRASE=
+CERT_FILE_ENCODING=
 
 # MAIL (NODEMAILER)
 # SENDGRID
diff --git a/packages/signing/addDigitalSignature.ts b/packages/signing/addDigitalSignature.ts
index 98e25879e..6f191ceda 100644
--- a/packages/signing/addDigitalSignature.ts
+++ b/packages/signing/addDigitalSignature.ts
@@ -1,7 +1,7 @@
 import { PDFDocument, PDFHexString, PDFName, PDFNumber, PDFString } from "pdf-lib";
 
 
-const fs = require("fs");
+import fs from "fs";
 // Local copy of Node SignPDF because https://github.com/vbuch/node-signpdf/pull/187 was not published in NPM yet. Can be switched to npm packge.
 const signer = require("./node-signpdf/dist/signpdf");
 
@@ -9,7 +9,9 @@ export const addDigitalSignature = async (documentAsBase64: string): Promise<str
   // Custom code to add Byterange to PDF
   const PDFArrayCustom = require("./PDFArrayCustom");
   const pdfBuffer = Buffer.from(documentAsBase64, "base64");
-  const p12Buffer = fs.readFileSync(process.env.CERT_FILE_PATH || "ressources/cert.p12");
+  const p12Buffer = fs.readFileSync(process.env.CERT_FILE_PATH || "ressources/certificate.p12", {
+    encoding: (process.env.CERT_FILE_ENCODING as BufferEncoding) || null,
+  });
   const SIGNATURE_LENGTH = 12000;
 
   const pdfDoc = await PDFDocument.load(pdfBuffer);