encryption vs enigma

encryption

noun
  • The process of obscuring information to make it unreadable without special knowledge, key files, or passwords. 

  • A ciphertext, a cryptogram, an encrypted value. Usually used with the preposition "of" followed by the value that is hidden in it. 

enigma

noun
  • Mysteriousness; obscurity; lack of clarity. 

  • A species of grasshopper, Oedaleonotus enigma. 

  • A riddle, or a difficult problem. 

  • The Talaud kingfisher, Todiramphus enigma. 

  • A rare species of moth, Heliothis enigma. 

  • A style of literature characterized by obscurity and hints of transcendental meaning. 

  • Something or someone puzzling, mysterious or inexplicable. 

  • A protein with three LIM domains (a conserved cysteine- and histidine-rich structure of two adjacent zinc fingers) at the C terminus that regulates protein phosphorylation. 

  • Riddles and puzzles, collectively. 

How often have the words encryption and enigma occurred in a corpus of books? (source: Google Ngram Viewer )