Abstract
Research demonstrates that a Fresnel hologram can be generated and simultaneously
encrypted numerically based on a secret symmetric key formed by the maximal length sequence
(M-sequence). The method can be directly extended to encrypt a video holographic clip in a
frame-by-frame manner. However, given the limited combination of signals in the family of
M-sequence, hacking the secret key through trial and error can be time consuming but not difficult.
In this letter, we propose a method that is difficult to crack with brute force for encrypting a
holographic video sequence. An M-sequence is first randomly assigned to encrypt each frame of the
holographic video signal. Subsequently, the index of the selected M-sequence, which is necessary to
decrypt the hologram, is encrypted with the RSA algorithm before transmitting to the receiving end.
At the receiving end, the decoder is provided with a private key to recover the index for each
frame, and the corresponding M-sequence is used to decrypt the encoded hologram.
© 2013 Chinese Optics Letters
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription