access key normally required ie study crack encryption algorithms implementations use terms ''' cryptography ''' ''' cryptology ''' interchangeably english others including us military practice generally use cryptography refer specifically use practice cryptographic techniques cryptology refer combined study cryptography cryptanalysis ref name goldreichbook oded goldreich ''foundations cryptography volume basic tools'' cambridge university press ref ref name websters ref english flexible several languages cryptology done cryptologists always used second
Formal science Computer science Computer security Cryptography