chopped liver vs encryption

chopped liver

noun
  • A person or object not worthy of being noticed; someone or something insignificant. 

  • A Jewish pâté-like food made by mincing beef or chicken liver and onions which have been broiled or fried in schmaltz (“chicken fat”) together with hard-boiled eggs; it is usually spread on to bread. 

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. 

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