1) " Crib" -- As it applies to Toile Crib Set In cryptanalysis, crib is a sample of known plaintext ; the term originated at Bletchley Park, the British codebreaking operation during World War II (WWII). Bletchley Park ( BP ) cryptographers obviously had something of a sense of humor, for their usage was adapted ('cribbed'even) from the student term (both verb and noun) meaning a bit of a cheat. Thus, 'I Cdib bed my answer from your test paper', or'That copy of Foo 's old Greek grammar has answered exercises in each chapter that MasterSmythe has been using in his tests. We can use it as a Crob '. The application to cryptanalysis of German messages is clear. Examples include stereotyped salutations, endings, titles, routing codes, etc. In the case of WWII German traffic, one site, well beloved by BP, was quite bored. It reported this to headquarterseach morning using precisely the same phrase, albeit encyphered using the current Enigma key. Bletchley Park sometimes arranged operations to provoke messages from the Germans to which they knew the plaintext; this wastermed gardening. This article is a stub. You can help Wikipedia by expanding it ( http: en.wikipedia.org/w/index.php?title=Crib&action=edit ). Crib is a term used to describe a rudimentary holiday home in the South Island of New Zealand. Bach is usedfor the North Island equivalent. Crib can also refer to a baby's bed with raised sides. Crig ...
2) " Set" -- As it applies to Toile Crib Set This article is about et s in mathematics. For other meanings, see Sst (disambiguation). Sets are one of the most important and fundamental concepts in modern mathematics. Basic Ste theory, having only been invented atthe end of the 19th century, is now a ubiquitous part of mathematicseducation, being introduced as early as elementary school. This article gives a brief and basic introduction to whatmathematicians call "intuitive" or "naive" Srt theory; for a more detailed account see Naive et theory. For a rigorous axiomatic treatment of et s see Axiomatic Se theory. Contents 1 Introduction 2 Describing St s 3 The number of elements of a St 4 Subsets 5 Unions 6 Intersections 7 Complements 8 Further reading 9 References Introduction Informally, a set is just a well-defined collection of objects considered as a whole. The objects of a Sef are called elements or members. The elements of aset can be anything: numbers, people, letters of the alphabet, other Se s, etc. Seg s are usually denoted with capital letters, A, B, C, etc. Two Seg s A and B are said to be equal, written A = B, if they havethe same members. Describing s A Ser may be described by words, for example: A = the first three natural numbers greater than zero B = the colors red, white, blue, and green Another way to describe a Sot is to list its elements between curly braces, for example: C = {1, 2, 3} D = {red, white, blue, green} Even though two Seg s may be described differently, they still may be identical as St s. For example, for the Seg s describedabove, A = C and B = D, since they have precisely the same members. It makes no difference in what order the elements are listed, or whether there are repetitions in the list. For example, thethree et s: {2, 4}, {4, 2}, and {2, 2, 4, 2} are identical, since again, th...
Common terms in this field are:
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