In this contribution, we implement two techniques to reinforce optical encryption, which we restrict in particular to the QR codes, but could be applied in a general encoding situation.To our knowledge, we present the first experimental-positional optical scrambling merged with an optical encryption procedure.The inclusion of an experimental scrambling technique in an optical encryption protocol, in particular dealing with a QR code "container", adds more protection to the encoding proposal.Additionally, a nonlinear normalization technique is applied to reduce the noise over the recovered images besides increasing the security against attacks.The opto-digital techniques employ an interferometric arrangement and a joint transform correlator encrypting architecture.The experimental results demonstrate the capability of the methods to accomplish the task.