Hash algorithm and authentication method based on cmos image sensor puf
An image sensor and image technology, applied in the direction of instruments, calculations, computer components, etc., can solve the problems that cannot play a decisive role, cannot effectively prove the legality of image content acquisition channels, cannot prove the source of digital image creation, etc.
Active Publication Date: 2019-07-16
JIANGSU WOERSON ELECTRONIC TECH CO LTD
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In addition, even with a valid key, it is impossible to effectively prove the legitimacy of the way to obtain the image content
Evidence that does not prove the creative origin of a digital image cannot be decisive in court
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[0065] The present invention will be further explained below in conjunction with the accompanying drawings of the specification.
[0066] The present invention provides a hash algorithm based on CMOS image sensor PUF, such as figure 1 As shown, including the following steps:
[0067] 1) The original image is collected by the CMOS image sensor in the camera, and the original image is preprocessed to obtain a preprocessed image with a pixel size of N×N, where N is a natural number.
[0068] Among them, the original image is preprocessed, specifically,
[0069] 1-1) Size normalization;
[0070] Normalize the collected original image into a normalized image with a pixel size of N×N through bilinear difference and down-sampling; the purpose of normalization is not only to ensure the flexibility of the Hash algorithm for repeated operations , And to ensure that the generated image hash has a fixed length and the same computational complexity. Therefore, a larger pixel N will increase the c...
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The invention discloses a hash algorithm and an authentication method based on a CMOS image sensor PUF, wherein the hash algorithm uses a preprocessing method to improve the robustness of the image, and then extracts the main features of the image in the two-dimensional DCT domain to generate features Vector F, and then use the inherent physical unclonable function PUF of the CMOS image sensor to establish a stimulus-response mapping and encrypt to generate a response, that is, a hash value; the authentication method is to calculate and compare the corresponding hashes of the image to be detected and the original image vector to distinguish tampered images from similar images. The present invention provides a root of trust (RoT) service based on CMOS image sensor PUF hash algorithm and authentication method for image content authentication, realizes that no symmetric key is used, and can guarantee the security of authentication from the root, and is especially suitable for underlying hardware image content authentication.
Description
Technical field [0001] The invention relates to a hash algorithm, in particular to a hash algorithm and authentication method based on a CMOS image sensor PUF, belonging to the field of hardware security and image content authentication. Background technique [0002] In the past ten years, more and more human operation tools have been eliminated. The reason they are replaced in some key applications is that these autonomous decision support systems can easily be deceived by malicious manipulation of image content, thereby making wrong decisions with serious consequences. In order to ensure the content integrity of digital images, many image hash (Hash) algorithms have been proposed for image authentication. [0003] Perceptual image hashing is a compact summary of content-based digital images. The main features based on human visual characteristics are extracted from the image content, and then applied to a one-way function to generate a hash vector. Image content can be authent...
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IPC IPC(8): G06K9/46
CPCG06V10/446
Inventor 曹元汪子伟韩庆邦
Owner JIANGSU WOERSON ELECTRONIC TECH CO LTD