書しょ籍せき暗あん号ごう

noun

book cipher; Ottendorf cipher

A cipher where each plaintext letter is encoded by a book, page, line, and word position. Used in classical cryptography.

• 書しょ籍せき暗あん号ごうは、あらかじめ決きめた本ほんの特とく定ていの単たん語ごを参さん照しょうして暗あん号ごう化かする方ほう法ほうだ。

  A book cipher is a method of encryption that refers to specific words in a prearranged book.