Method and system for secure printing of image

A method for printing a first image and a similar second image, said method comprising the steps of:

• forming a sequence of graphic data blocks for each of said first and second images, said sequence forming a bitmap representative of each respective image;
• selecting first varying rates of travel and proportional printing rates for a print head to print each of said blocks in said first image;
• sequentially positioning the print head and printing said blocks in said first image at said selected first rates of travel and said print rates;
• selecting second varying rates of travel and proportional printing rates for said print head to print each of said blocks in said second image, said second rate of travel for a block of said second image being different than said first rate of travel for a corresponding block of said first image;
• and
• sequentially positioning the print head and printing said blocks in said second image at said selected second rates of travel and said print rates.