Alphanumeric code


Alphanumeric code
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In general, in computing, an alphanumeric code is a series of letters and numbers (hence the name) which are written in a form that can be processed by a computer.

Specifically, in computer hacker terminology, alphanumeric code is machine code that is written so that it assembles into entirely alphanumeric ASCII or Unicode characters such as 0-9, A-Z and a-z[1][2]. This type of encoding was created by hackers to hide working machine code inside what appears to be text. This can be useful to avoid detection of the code and to allow the code to pass through filters that modify or remove non-alphanumeric characters unchanged. A similar type of encoding is called printable code and uses all printable characters (0-9, A-Z, a-z, !@#%^&*() etc...) It has been shown that it is possible to create shellcode that looks like normal text in English.[3]

Writing alphanumeric or printable code require good understanding of the instruction set architecture of the machine on which the code is to be executed.

See also

  • EICAR test file - a test pattern used to test the installation of the anti virus software, which is written in printable code.

Further reading

References


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Look at other dictionaries:

  • alphanumeric code — abėcėlinis skaitmeninis kodas statusas T sritis automatika atitikmenys: angl. alphameric code; alphanumeric code vok. alphanumerischer Code, m rus. буквенно цифровой код, m pranc. code alphanumérique, m …   Automatikos terminų žodynas

  • Alphanumeric code — Буквенно цифровой код …   Краткий толковый словарь по полиграфии

  • alphanumeric code — method of representation using both letters and numbers …   English contemporary dictionary

  • Alphanumeric — is a is portmanteau of alphabetic and numeric and is used to describe the collection of Latin letters and Arabic digits used by much of western society. There are either 36 (single case) or 62 (case sensitive) alphanumeric characters. The… …   Wikipedia

  • alphanumeric — al‧pha‧nu‧me‧ric [ˌælfənjuː merɪk ǁ nuː ] also al‧phanu‧me‧ric‧al [ ˈmerɪkl] adjective using letters and numbers: • an alphanumeric password * * * alphanumeric UK US /ˌælfənjuːˈmerɪk/ adjective (also alphanumerical) ► …   Financial and business terms

  • alphanumeric — also alphanumerical adjective Etymology: alphabetic + numeric, numerical Date: 1950 1. consisting of both letters and numbers and often other symbols (as punctuation marks and mathematical symbols) < an alphanumeric code >; also being a character …   New Collegiate Dictionary

  • alphanumeric — alphanumerically, alphamerically, adv. /al feuh nooh mer ik, nyooh /, adj. Computers. (of a set of characters) including letters, numbers, and, often, special characters, as punctuation marks: alphanumeric code. Also, alphameric /al feuh mer ik/ …   Universalium

  • alphanumeric — adjective using letters and numbers: an alphanumeric code …   Longman dictionary of contemporary English

  • alphanumeric — al•pha•nu•mer•ic [[t]ˌæl fə nuˈmɛr ɪk, nyu [/t]] also al pha•nu•mer′i•cal adj. cmp utilizing letters, numbers, and often special characters or symbols: an alphanumeric code[/ex] • Etymology: 1950–55; alpha (bet) +numeric ( al) al… …   From formal English to slang

  • code alphanumérique — abėcėlinis skaitmeninis kodas statusas T sritis automatika atitikmenys: angl. alphameric code; alphanumeric code vok. alphanumerischer Code, m rus. буквенно цифровой код, m pranc. code alphanumérique, m …   Automatikos terminų žodynas