Decoupled multi-party reversible data hiding method in encrypted domain

A decoupled multi-party reversible data hiding method in encrypted domain, applied in a multi-party reversible data hiding model in encrypted domain, wherein the multi-party reversible data hiding model in encrypted domain comprises a content owner, a data hider, and a plurality of receivers;

• wherein
• the data hider comprises a plurality of data sub-hiders;
• all the data sub-hiders in the data hider are connected to the content owner;
• any one of the receivers is connected to a plurality of authorized data sub-hiders, wherein the authorized data sub-hiders are data sub-hiders authorized to the receiver in the data hider;
• and
• wherein the method comprises:
• performing, by the content owner, decoupled encryption on an original carrier by using an encryption key to generate a plurality of encrypted carriers, and sending the plurality of encrypted carriers to corresponding data sub-hiders, wherein a preset number of arbitrary encrypted carriers contain all information of the original carrier, any single encrypted carrier contains only partial information of the original carrier, and the preset number is less than a total number of the encrypted carriers;
• embedding, by the data sub-hiders, data to be hidden into the encrypted carriers using a data hiding key, to obtain corresponding marked encrypted carriers;
• determining any one of the receivers as a current receiver;
• sending, by the data hider, some of the marked encrypted carriers as authorized marked encrypted carriers to the current receiver;
• extracting, by the current receiver, when the number of the authorized marked encrypted carriers reaches the preset number, embedded data from the preset number of the authorized marked encrypted carriers by using the data hiding key, wherein the embedded data is the same as the data to be hidden;
• and
• performing, by the current receiver, carrier recovery on the authorized marked encrypted carriers by using a decryption key, to obtain the original carrier.