Method and device for securing a document, method and device for control corresponding thereto and secure document

Method for securing a document, comprising:

• inputting a digital file representing an image representative of at least one portion of the document;
• extracting characteristic elements of the image and positions of said characteristic elements on the document;
• generating message containing information regarding the document;
• encoding the message into an anti-copy mark
• encoding into a matrix code said anti-copy mark together with said characteristic elements of the image and data representative of the position of said characteristic elements on the document, into a matrix code;
• and
• printing the matrix code on or in said document.

Device for controlling the authenticity of a candidate document, comprising:

• an image sensor for capturing an image of at least one portion of the document and an image of a matrix code carried by said document;
• a data processor configured to extract characteristic elements of the captured image
• the data processor further decoding the matrix code in order to decode:
• an anti-copy mark including message containing information regarding the document characteristic elements of an image of an authentic document;
• and
• positions of said characteristic elements in said authentic document;
• the data processor further verifying a content and position match between:
• the extracted characteristic elements and the characteristic elements of the decoded authentic document.

Method for controlling the authenticity of a candidate document, comprising:

• capturing an image of at least one portion of the document;
• capturing an image of a matrix code carried by said document;
• extracting characteristic elements of the captured image;
• decoding the matrix code in order to decode:
• an anti-copy mark including message containing information regarding the document characteristic elements of an image of an authentic document;
• and
• positions of said characteristic elements in said authentic document;
• verifying a content and position match between:
• the extracted characteristic elements and the characteristic elements of the decoded authentic document.