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(There are several ways to pick these patterns—those distinguish between the various superimposed codes; we discuss them below). When a new book comes in, make a new card for it: Get a blank card with the standard N holes in it and write down the name of the book, etc. in the middle. Write down the subjects covered by the book on the card.
In cryptography, a codebook is a document used for implementing a code. A codebook contains a lookup table for coding and decoding; each word or phrase has one or more strings which replace it. To decipher messages written in code, corresponding copies of the codebook must be available at either end. The distribution and physical security of ...
An index card in a library card catalog.This type of cataloging has mostly been supplanted by computerization. A hand-written American index card A ruled index card. An index card (or record card in British English and system cards in Australian English) consists of card stock (heavy paper) cut to a standard size, used for recording and storing small amounts of discrete data.
A copyright page with the printer's key underlined. This version of the book is the eighteenth printing. The printer's key, also known as the number line, is a line of text printed on a book's copyright page (often the verso of the title page, especially in English-language publishing) used to indicate the print run of the particular edition.
Crossed letter. Cross-hatched letter of 1837, Massachusetts, USA. A crossed letter is a manuscript letter which contains two separate sets of writing, one written over the other at right-angles. [1] [2] This was done during the early days of the postal system in the 19th century to save on expensive postage charges, as well as to save paper.
Book cipher. The King James Bible, a highly available publication suitable for the book cipher. A book cipher is a cipher in which each word or letter in the plaintext of a message is replaced by some code that locates it in another text, the key . A simple version of such a cipher would use a specific book as the key, and would replace each ...
t. e. In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by ...
Updated Mon, Oct 5, 2015 · 1 min read. Paper art doesn't have to be flat and lifeless... just ask Aristides Garcia. The artist recently created an interactive sculpture, Tesela, that uses a ...
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