The building society will use electronic signature-verification pads throughout its administration centres to check the identity of staff making customer payments. They will also serve as an electronic seal to record transactions.
After logging into the payments system, administration staff sign an electronic pad, supplied by Interlink Electronics, which verifies their signature against a stored version, before authorising the payment.
Signatures are verified through a variety of criteria, including pen pressure, the shape of handwriting and elapsed time.
A spokeswoman for Nationwide declined to reveal the value of the deal with Interlink, but said that it would improve vetting procedures when making payments and help cut administration costs.