Question

review the excerpt from the code book. cryptanalysts realize that their real goal is to find a way of cracking the rsa cipher, the cornerstone of modern encryption... use the meaning of the underlined words above to understand the sentence. davids family was puzzled by the short and cryptic note he left on the table. what does cryptic mean? clear plain believable mysterious

Explanation:

The context clues "puzzled" and the association with cryptanalysis (which deals with codes and mysteries) suggest that "cryptic" means something that is hard to understand or mysterious.

Answer:

mysterious