A Double Encryption Method for Reversible Data Hiding of Encrypted Domain Image

Abstract

The invention discloses a dual encryption type reversible data hiding method of an encryption domain image. The method comprises three parts, namely, image encryption, reversible data hiding of the encryption domain image, secrete data extraction and original image lossless restoration; a double encryption mechanism is adopted in the image encryption part to enhance the security; secret information can be directly embedded in the encrypted images, even if the data hider knows nothing about the original image contents, the image content security and privacy leakage problems can still be effectively solved, no complex protocol is needed between the image encipherer and the secret information embedding person, and the encryption and data embedding generate no expansion of image data; the practicability is high, if only a data hiding key is present, the hidden secret information can be directly extracted from a ciphertext domain image; if only an encryption key is present, an approximate original image can be obtained by direct decryption; and if the data hiding key and the encryption key are present, it can be guaranteed that the original image can be restored without distortion afterthe hidden secret information is extracted.

Description

technical field [0001] The invention relates to an image reversible data hiding technology, in particular to a double-encrypted encryption domain image reversible data hiding method. Background technique [0002] Under the cloud computing platform, the provider of multimedia content does not have to be a storer and a processor at the same time. In this mode of work, user data is largely "out of control". One of the best ways to ensure the security of multimedia data is to encrypt the multimedia. Users first encrypt sensitive content before uploading. All processing and calculations in the cloud are performed in the ciphertext domain, and the processing results are provided to the user. The user can only obtain the plaintext data after decryption. For example, medical institutions are obliged to protect the privacy of patients, but their data processing capabilities are weak. In order to achieve better medical effects or scientific research levels, they need to entrust a th...

AI Technical Summary

Problems solved by technology

The existing encryption domain reversible data hiding technology can be divided into three categories: the first category is to encrypt the image and then find the data embedding space, this kind of method generally has a low embedding capacity, and data extraction errors will occur; the second category is the image The data embedding space is reserved before encryption. This type of method has a large embedding capacity and low distortion, but the disadvantage is that a complex protocol is required between the image encryptor and the data embedder; the third type is to use homomorphic encryption to realize reversible image data in the ciphertext domain Hidden, but homomorphic encryption can easily cause ciphertext data expansion

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