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PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.
The integrated circuit (IC) chips in a computer typically contain billions of tiny metal–oxide–semiconductor field-effect transistors (MOSFETs). [48] Components directly attached to or to part of the motherboard include: At least one CPU (central processing unit), which performs most of the calculations that enable a computer to function. [49]
A human computer, with microscope and calculator, 1952. It was not until the mid-20th century that the word acquired its modern definition; according to the Oxford English Dictionary, the first known use of the word computer was in a different sense, in a 1613 book called The Yong Mans Gleanings by the English writer Richard Brathwait: "I haue [] read the truest computer of Times, and the best ...
Most computer resources are managed by the CU. It directs the flow of data between the CPU and the other devices. John von Neumann included the control unit as part of the von Neumann architecture. In modern computer designs, the control unit is typically an internal part of the CPU with its overall role and operation unchanged since its ...
A technology consisting of computer components and recording media used to retain digital data. It is a core function and fundamental component of computers. [1] device memory local memory associated with a hardware device such as a graphics processing unit or OpenCL compute device, distinct from main memory. Digital Video Disc (DVD)
CAD—Computer-aided design; CAE—Computer-aided engineering; CAID—Computer-aided industrial design; CAI—Computer-aided instruction; CAM—Computer-aided manufacturing; CAP—Consistency availability partition tolerance (theorem) CAPTCHA—Completely automated public Turing test to tell computers and humans apart; CAT—Computer-aided ...
The first documented computer architecture was in the correspondence between Charles Babbage and Ada Lovelace, describing the analytical engine.While building the computer Z1 in 1936, Konrad Zuse described in two patent applications for his future projects that machine instructions could be stored in the same storage used for data, i.e., the stored-program concept.
The final revised documentation for PDF 1.7 was approved by ISO Technical Committee 171 in January 2008 and published as ISO 32000-1:2008 on July 1, 2008, and titled Document management – Portable document format – Part 1: PDF 1.7. ISO 32000-1:2008 is the first ISO standard for full function PDF.