Words to Describe ciphers

How ciphers often is described ("________ ciphers")

• empty
• secure
• modern
• numerical
• simple
• bit
• paltry
• most
• many
• passive
• proportional
• italian
• arithmetical
• grade
• null
• intercepted
• iterated
• japanese
• conventional
• soviet
• classical
• naval
• british
• difficult
• interchangeable
• based
• mysterious
• symmetric
• anonymous
• german
• arabic
• asymmetric
• one
• numeral
• mere
• royal
• key
• synchronous
• russian
• unbreakable
• abstract
• decimal
• diplomatic
• military
• available
• weak
• secret
• unnecessary
• additive
• complicated
• polyalphabetic
• arabian
• strange
• roman
• complex
• cabalistic
• synchronizing
• weakest
• multiple