thumb|U.S. State Department code book issued in 1899, an example of a one-part code, at the National Cryptologic Museum thumb|Page 187 of the State Department 1899 code book, a one-part code with a choice of code word or numeric ciphertext. Numeric codes are prefixed by the page number.
thumb|U.S. State Department code book issued in 1899, an example of a one-part code, at the National Cryptologic Museum thumb|Page 187 of the State Department 1899 code book, a one-part code with a choice of code word or numeric ciphertext. Numeric codes are prefixed by the page number.
A codebook is a type of document used for gathering and storing cryptography codes. Originally, codebooks were often literally books, but today "codebook" is a byword for the complete record of a series of codes, regardless of physical format.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).