Look at the products you buy at the store (supermarket, Walmart, Target, etc) - the barcode is almost always EAN (now IAN)¹  There are exceptions for smaller items like packs of gum, which use UPC-E² encoding (if the manufacturer portion ends in zeros).  Hundreds of thousands of products being purchased by billions of people mean they&#x27;re the dominant barcode system.<p>So far as attacks via UPC&#x2F;EAN&#x2F;IAN, they&#x27;re not really possible as it only encodes digits, and only 13 of them.<p>¹ <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;International_Article_Number_(EAN)" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;International_Article_Number_(...</a><p>² <a href="http:&#x2F;&#x2F;www.barcodeisland.com&#x2F;upce.phtml" rel="nofollow">http:&#x2F;&#x2F;www.barcodeisland.com&#x2F;upce.phtml</a>