A new encrypted computer-generated holographic technique is presented. The watermark image is encoded with double-random-phase encoding. The encrypted image with complex value is transformed to hologram by conjugate symmetric extension and Fourier transform. The decrypted image is not superimposed by perceptual noise. The original watermark is quick response (QR) code. The hologram generated from the preprocessed QR code is embedded in the intermediate frequency coefficients of original image. The extracted QR code from the watermarked image under print-scan attack can be decoded correctly. The QR code represents not only a picture, but also text message. So the message decoded from the QR code makes authority verification more precisely. The proposed algorithm is of high practical value.