Final answer:
The Running key cipher typically uses a passage from a well-known book as its encryption key, differing from the Transposition Cipher used in the Zimmerman Telegram which rearranges plaintext letters based on a keyword.
Step-by-step explanation:
The type of cryptosystem that commonly makes use of a passage from a well-known book for the encryption key is the Running key cipher. This cipher is a form of classical cipher where a long piece of text, like a passage from a book, is used to encrypt a plaintext. In contrast to the Zimmerman Telegram, which used a Transposition Cipher, the Running key cipher does not rely on rearranging the plaintext but rather on using a non-repeating long key, which ideally is as long as the plaintext.
It’s important to understand that in a Transposition Cipher, the method of encryption involves rearranging the letters of the plaintext according to a certain rule. This rule can involve dividing the plaintext into blocks and then changing the order of letters within each block based on a keyword. The keyword often determines the size of the blocks and the specific permutation of the letters within these blocks.