Definition of "cryptography"

cryptography

/kɹɪpˈtɒɡ.ɹə.fi/

noun
usually uncountable, plural cryptographies
1. The discipline concerned with communication security (eg, confidentiality of messages, integrity of messages, sender authentication, non-repudiation of messages, and many other related issues), regardless of the used medium such as pencil and paper or computers.
  Quotations
  We might abate...the strange cryptography of Gaffarell in his Starrie Booke of Heaven.
  1658, Sir Thomas Browne (first use in English)