'cipher' originates from Arabic, specifically the word 'ṣifr,' where 'ṣifr' meant 'zero' or 'empty.'

'ṣifr' changed from the Arabic word 'ṣifr' and eventually became the modern English word 'cipher' through Old French 'cifre.'

Initially, it meant 'zero,' but over time it evolved into its current meaning of 'a secret code.'