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Bidi
A bidirectional text contains two text directionalities, right-to-left (RTL) and left-to-right (LTR). It generally involves text containing different types of alphabets, but may also refer to boustrophedon, which is changing text direction in each row. An example is the RTL Hebrew name Sarah: , spelled sin (ש) on the right, resh (ר) in the middle, and heh (ה) on the left. Many computer programs failed to display this correctly, because they were designed to display text in one direction only. Some so-called right-to-left scripts such as the Persian script and Arabic are mostly, but not exclusively, right-to-left—mathematical expressions, numeric dates and numbers bearing units are embedded from left to right. That also happens if text from a left-to-right language such as English is embedded in them; or vice versa, if Arabic is embedded in a left-to-right script such as English. Bidirectional script support Bidirectional script support is the capability of a computer sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trojan Source
Trojan Source is a Vulnerability (computing), software vulnerability that abuses Unicode's bidirectional characters to display source code differently than the actual execution of the source code. The exploit utilizes how writing scripts of different reading directions are displayed and encoded on computers. It was discovered by Nicholas Boucher and Ross Anderson at University of Cambridge, Cambridge University in late 2021. Background Unicode is an encoding standard for representing text, symbols, and glyphs. Unicode is the most dominant encoding on computers, used in over 98% of websites . It supports many languages, and because of this, it must support different methods of writing text. This requires support for both Left to left-to-right languages, such as English and Russian, and Right-to-left script, right-to-left languages, such as Hebrew language, Hebrew and Arabic. Since Unicode aims to enable using more than one writing system, it must be able to mix scripts with dif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ISO/IEC 8859-8
ISO/IEC 8859-8, ''Information technology — 8-bit single-byte coded graphic character sets — Part 8: Latin/Hebrew alphabet'', is part of the ISO/IEC 8859 series of ASCII-based standard character encodings. ISO/IEC 8859-8:1999 from 1999 represents its second and current revision, preceded by the first edition ISO/IEC 8859-8:1988 in 1988. It is informally referred to as Latin/Hebrew. ''ISO/IEC 8859-8'' covers all the Hebrew letters, but no Hebrew vowel signs. IBM assigned code page 916 (CCSIDs 916 and 5012) to it. This character set was also adopted by Israeli Standard SI1311:2002, with some extensions. ISO-8859-8 is the IANA preferred charset name for this standard when supplemented with the C0 and C1 control codes from ISO/IEC 6429. The text is (usually) in logical order, so bidi processing is required for display. Nominally ''ISO-8859-8'' (code page 28598) is for “visual order”, and ISO-8859-8- (code page 38598) is for logical order. But usually in practice, and required ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unicode
Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Character (computing), characters and 168 script (Unicode), scripts used in various ordinary, literary, academic, and technical contexts. Unicode has largely supplanted the previous environment of a myriad of incompatible character sets used within different locales and on different computer architectures. The entire repertoire of these sets, plus many additional characters, were merged into the single Unicode set. Unicode is used to encode the vast majority of text on the Internet, including most web pages, and relevant Unicode support has become a common consideration in contemporary software development. Unicode is ultimately capable of encoding more than 1.1 million characters. The Unicode character repertoire is synchronized with Univers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unicode Control Characters
Many Unicode characters are used to control the interpretation or display of text, but these characters themselves have no visual or spatial representation. For example, the null character ( ) is used in C-programming application environments to indicate the end of a string of characters. In this way, these programs only require a single starting memory address for a string (as opposed to a starting address and a length), since the string ends once the program reads the null character. In the narrowest sense, a ''control code'' is a character with the general category , which comprises the C0 and C1 control codes, a concept defined in ISO/IEC 2022 and inherited by Unicode, with the most common set being defined in ISO/IEC 6429. Control codes are handled distinctly from ordinary Unicode characters, for example, by not being assigned character names (although they are assigned normative formal aliases). In a broader sense, other non-printing format characters, such as thos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Writing System
A writing system comprises a set of symbols, called a ''script'', as well as the rules by which the script represents a particular language. The earliest writing appeared during the late 4th millennium BC. Throughout history, each independently invented writing system gradually emerged from a system of proto-writing, where a small number of ideographs were used in a manner incapable of fully encoding language, and thus lacking the ability to express a broad range of ideas. Writing systems are generally classified according to how its symbols, called ''graphemes'', relate to units of language. Phonetic writing systemswhich include alphabets and syllabariesuse graphemes that correspond to sounds in the corresponding spoken language. Alphabets use graphemes called ''letter (alphabet), letters'' that generally correspond to spoken phonemes. They are typically divided into three sub-types: ''Pure alphabets'' use letters to represent both consonant and vowel sounds, ''abjads'' gene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer
A computer is a machine that can be Computer programming, programmed to automatically Execution (computing), carry out sequences of arithmetic or logical operations (''computation''). Modern digital electronic computers can perform generic sets of operations known as Computer program, ''programs'', which enable computers to perform a wide range of tasks. The term computer system may refer to a nominally complete computer that includes the Computer hardware, hardware, operating system, software, and peripheral equipment needed and used for full operation; or to a group of computers that are linked and function together, such as a computer network or computer cluster. A broad range of Programmable logic controller, industrial and Consumer electronics, consumer products use computers as control systems, including simple special-purpose devices like microwave ovens and remote controls, and factory devices like industrial robots. Computers are at the core of general-purpose devices ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Egyptian Language
The Egyptian language, or Ancient Egyptian (; ), is an extinct branch of the Afro-Asiatic languages that was spoken in ancient Egypt. It is known today from a large corpus of surviving texts, which were made accessible to the modern world following the decipherment of the ancient Egyptian scripts in the early 19th century. Egyptian is one of the earliest known written languages, first recorded in the hieroglyphic script in the late 4th millennium BC. It is also the longest-attested human language, with a written record spanning over 4,000 years. Its classical form, known as " Middle Egyptian," served as the vernacular of the Middle Kingdom of Egypt and remained the literary language of Egypt until the Roman period. By the time of classical antiquity, the spoken language had evolved into Demotic, and by the Roman era, diversified into various Coptic dialects. These were eventually supplanted by Arabic after the Muslim conquest of Egypt, although Bohairic Coptic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sabaic
Sabaic, sometimes referred to as Sabaean, was a Old South Arabian, Sayhadic language that was spoken between c. 1000 BC and the 6th century AD by the Sabaeans. It was used as a written language by some other peoples of the ancient civilization of South Arabia, including the Himyarites, Ḥimyarites, Ḥashidites, Ṣirwāḥites, Humlanites, Ghaymānites, and Radmānites. Sabaic belongs to the South Arabian Semitic languages, Semitic branch of the Afroasiatic languages, Afroasiatic language family. Sabaic is distinguished from the other members of the Old South Arabian, Sayhadic group by its use of ''h'' to mark the grammatical person, third person and as a causative prefix; all of the other languages use ''s1'' in those cases. Therefore, Sabaic is called an ''h''-language and the others ''s''-languages. Numerous other Sabaic inscriptions have also been found dating back to the Sabean colonization of Africa. Sabaic is very similar to Arabic and the languages may have been mutually ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
