123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setup123.hp.com/setupThe printers utilizing inkjet technology were first introduced in the late 1980s and since then have gained much popularity while growing in performance and dropping in price. They are the most common type of computer printers for the general consumer due to their low cost, high quality of output, capability of printing in vivid color, and ease of use. Each printer which works on inkjet technology places extremely small droplets of ink onto paper to create a text or an image. In the personal and small business computer market, inkjet printers currently predominate. Inkjets are usually inexpensive, quiet, reasonably fast, and many models can produce high quality output. Like most modern technologies, the present-day inkjet is built on the progress made by many earlier versions. Among many contributors, Epson, Hewlett-Packard and Canon can claim a substantial share of credit for the development of the modern inkjet technology.
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In either of these scenarios, improper disposal of a decommissioned printer could have catastrophic consequences for a company. Leased printers may be returned to the leasing company for resale. Purchased printers are discarded in the trash or sold at auction or online via auction sites such as eBay. Either way, countless sensitive documents could pass into the hands of nefarious individuals. While the leaking of some documents could financially affect organizations, leaking personal information pertaining to hundreds or thousands of customers or clients could have reputation ramifications that could destroy a company.
While the previous data leakage scenarios have been accidental in nature, data remaining on printers could be the target of an educated attacker, one that understands the value of data residing on printers and who has the ability to compromise that data. While organizations invest hundreds of thousands of dollars to secure their network, dividing networks and systems into zones of trust with firewalls, Intrusion Prevention Systems and other network access control points, have they rarely considered where printers are logically placed within the network. In most cases, they are located amongst the users, or in some organizations, even on the server networks. Some organizations do not even have zones of trust and the printers exist amongst users, servers and even Internet accessible systems. In the worst case scenarios, the printers may even be Internet accessible themselves. Printers are not seen as critical devices, and as such, are not secured in their own zone of trust where access to management interfaces is not accessible except to trusted printer administrators. By limiting access to these interfaces, compromise of the data housed on these printers becomes exceedingly difficult.
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In the ideal, secure corporate environment, a user has restricted access to files that pertain to his or her job function. The files reside on a secure server within the corporate network and are protected by strong access control policies requiring a user to authenticate before being allowed access to files. In our example, a user requires a sensitive financial document for a meeting he is about to attend. The user authenticates to the server, access to the file is authorized by the access control policies set on the file and the user opens the file in Microsoft Word. He clicks on the print icon and sends the document as a print job to his nearest printer. With this simple act, we have taken a secure document that very limited users have access to, and have created two copies that are no longer protected by any form of access control. The first is the obvious; the paper copy our user requires for their meeting. The second is a copy housed in the buffer on the printer. In the ideal world, our user will keep the printed copy safe at all times and follow the organization's data destruction policy and destroy the copy of the document when they no longer require it. As for the virtual copy created on the printer, the user has no real control over this, nor probably knows it even exists. If we are lucky, the document is overwritten when the next print job comes through, but this is very dependent on the brand and model of printer and how the printer was initially set up by the administrator.
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Printers print one document at a time. This is similar to cows crossing a stream. If the first cow comes the stream and does not cross, all remaining cows wait in line to cross the stream behind the first cow. If the first cow does cross the stream, the other cows follow. When one of the other cows refuses across the stream, the cows following it stop and do not cross the stream.
Similarly, printers print all documents in the order that they are sent to the printer. If the ink runs out, if there is a paper the error, or if there is some other malfunction that stops a document from printing, that document and all remaining documents stop printing. After the error is corrected, the document may or may not automatically start printing. Sometimes you must restart the document printing for that document and subsequent documents to print.
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