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- Book_cipher abstract "A book cipher is a cipher in which the key is some aspect of a book or other piece of text; books being common and widely available in modern times, users of book ciphers take the position that the details of the key are sufficiently well hidden from attackers in practice. This is in some ways an example of security by obscurity. It is typically essential that both correspondents not only have the same book, but the same edition.Traditionally book ciphers work by replacing words in the plaintext of a message with the location of words from the book being used. In this mode, book ciphers are more properly called codes. This can have problems; if a word appears in the plaintext but not in the book, it cannot be encoded. An alternative approach which gets around this problem is to replace individual letters rather than words. One such method, used in the second Beale cipher, substitutes the first letter of a word in the book with that word's position. In this case, the book cipher is properly a cipher — specifically, a homophonic substitution cipher. However, if used often, this technique has the side effect of creating a larger ciphertext (typically 4 to 6 digits being required to encipher each letter or syllable) and increases the time and effort required to decode the message.".
- Book_cipher wikiPageID "449363".
- Book_cipher wikiPageRevisionID "590629693".
- Book_cipher hasPhotoCollection Book_cipher.
- Book_cipher subject Category:Classical_ciphers.
- Book_cipher type Abstraction100002137.
- Book_cipher type Cipher106254239.
- Book_cipher type ClassicalCiphers.
- Book_cipher type Communication100033020.
- Book_cipher type Message106253690.
- Book_cipher comment "A book cipher is a cipher in which the key is some aspect of a book or other piece of text; books being common and widely available in modern times, users of book ciphers take the position that the details of the key are sufficiently well hidden from attackers in practice. This is in some ways an example of security by obscurity.".
- Book_cipher label "Book cipher".
- Book_cipher label "Buch-Verschlüsselung".
- Book_cipher label "Szyfr Ottendorfa".
- Book_cipher label "Книжный шифр".
- Book_cipher sameAs Buch-Verschlüsselung.
- Book_cipher sameAs Szyfr_Ottendorfa.
- Book_cipher sameAs m.029t9c.
- Book_cipher sameAs Q997683.
- Book_cipher sameAs Q997683.
- Book_cipher sameAs Book_cipher.
- Book_cipher wasDerivedFrom Book_cipher?oldid=590629693.
- Book_cipher isPrimaryTopicOf Book_cipher.