ResearchdemonstratesthataFresnelhologramcanbegeneratedandsimultaneouslyencryptednumericallybasedonasecretsymmetrickeyformedbythemaximallengthsequence(M-sequence).Themethodcanbedirectlyextendedtoencryptavideoholographicclipinaframe-by-framemanner.However,giventhelimitedcombinationofsignalsinthefamilyofM-sequence,hackingthesecretkeythroughtrialanderrorcanbetimeconsumingbutnotdifficult.Inthisletter,weproposeamethodthatisdifficulttocrackwithbruteforceforencryptingaholographicvideosequence.AnM-sequenceisfirstrandomlyassignedtoencrypteachframeoftheholographicvideosignal.Subsequently,theindexoftheselectedM-sequence,whichisnecessarytodecryptthehologram,isencryptedwiththeRSAalgorithmbeforetransmittingtothereceivingend.Atthereceivingend,thedecoderisprovidedwithaprivatekeytorecovertheindexforeachframe,andthecorrespondingM-sequenceisusedtodecrypttheencodedhologram.
