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The Ritz Dakota Digital is a type of point-and-shoot digital camera, introduced in July of 2003, and sold by the Ritz Camera Centers. It has a digital photo resolution of 1.2 megapixels (1280 pixels wide, 960 pixels high) and a storage capacity of 25 pictures. When introduced, the Dakota Digital sparked massive interest, primarily due to its price tag: $10.99 (US Dollars). At the time, a digital camera of similar resolution and functionality was in the $40–$70 range. The reason for the low price was because the Dakota Digital was a ''single-use camera'', i.e. the consumer takes the pictures, returns the camera to the store, and the pictures are returned to the consumer in print and CD-ROM format (after an additional $11 processing fee) while the camera is refurbished and resold. Although the Dakota Digital wasn't the very first digital camera introduced under the single-use concept (Pentax and Sanyo introduced the world's first single-use digital camera in Japan two years prior ()), it was the first single-use digital camera to be mass-marketed (the Pentax/Sanyo camera was only a three-month trial run), as well as the first single-use digital camera sold in the United States. () Almost immediately after introduction, several people began work on hacking the single-use Dakota Digital in attempts to transform it into what would be the least expensive reusable digital camera available at the time. In November of 2003, only four months after it was introduced, they succeeded in this task. Technical details about the internal components were publicly posted on the Internet, along with instructions for creating various compatible link cables that connected the Dakota Digital to home PCs. Special third-party software was also made available, providing a way to download the pictures and clear the camera's internal flash memory to allow more pictures to be taken. The technical data, instructions and software fulfilled all requirements to make the Dakota Digital reusable. Public announcement of how to transform the single-use camera into a reusable camera, paired with the very low camera price, immediately created high demand for the Dakota Digital as people started buying them so they could acquire their own reusable digital camera at low cost. Along with the increased demand, Ritz began pulling the Dakota Digital out of its stores after learning of the hack. Because of these two factors, it very rapidly became difficult to find the original Dakota Digital camera. In July 2004, a group of hackers made available methods to further improve the original Dakota Digital by upgrading the camera's firmware, or internal programming. These firmware upgrades added several new features, most notably the ability to adjust or remove the original 25 picture limit, along with various other changes and improvements. A few months after the original Dakota Digital was pulled off the shelves, Ritz introduced two new models of Dakota Digital, the ''PV2'' series. One was similar to the original model with a price of $10.99, while the other, priced at $18.99, contained a color LCD screen that displayed the most recent picture taken. Both are based on an entirely new chipset manufactured by SMaL Camera Technologies. Hacking of this camera has been more of a group effort than the first. John Maushammer removed and read the FLASH memory chip, wrote a disassembler, and commented significant portions of the firmware. Others investigated the USB interface, and John figured out the authentication mechanism and how to disable it. Others figured out how to download the images using modified versions of software for SMaL's other cameras, and other people are reverse-engineering the proprietary RAW file format. The security mechanism on the original camera consisted of a challenge and response. The challenge was the camera's serial number, and the response was the 4-byte result of a simple hash function -- the serial number converted from ASCII to binary-coded decimal, negated bitwise, and multiplied by 4. The weakness is that the hash function was stored in the firmware, so it could be completely understood and replicated. The PV2 used a better challenge and response mechanism. It is better not because it uses a longer key (128 byte challenge, 128 byte response), but because the hash function is not stored algorithmically in firmware. Theoretically, the response could not be mathematically related to the challenge and the only correlation between the two could be a record saved in the manufacturer's database (which authorized processing systems would have to access to read pictures from the camera). In practice, though, only a few challenge/response pairs have been seen in the wild. ==External links== *(Slashdot | Ritz Disposable Digital Camera Hacked ) *(Technical details for the Ritz Dakota Digital, with the original Mac and Linux drivers ) *(Windows driver & more technical details for the Ritz Dakota Digital, including hacking instructions (From cexx.org) ) *(Details and instructions for upgrading the Dakota Digital firmware ) *(PV2 photos & technical details ) *(Bulletin Board with latest PV2 hacking discussion ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ritz Dakota Digital」の詳細全文を読む スポンサード リンク
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