1) What is a Private key a) multiple keys is used to encrypt and decrypt a message and must be given to the recipient of your message to decrypt the data b) A single key is used to encrypt and decrypt a message and must be given to the recipient of your message to decrypt the data c) A single key is used to only decrypt a message and must be given to the recipient of your message to decrypt the data d) A single key is used only to encrypt a message and must be given to the recipient of your message to decrypt the data 2) What is a Public key a) Three keys are used at once- one to encrypt and the other to decrypt the data b) One key that is used at once- one to encrypt and the other to decrypt the data c) Two keys are used at once- one to encrypt and the other to decrypt the data d) Four keys are used at once- one to encrypt and the other to decrypt the data 3) What is Caesar shift cipher a) When numbers replaces letters before decoded b) Where a letter is substituted by the next letter only. c) where all letters are substituted by the letters 10 spaces infront only.  d) a type of substitution cipher, i.e., each letter of a given text is replaced by a letter some fixed number of positions down the alphabet. 4) What is RLE frequency a) black = 1 white =0 b) black = 0 white =0 c) black = 1 white =1 d) black = 0 white =1 5) What is RGB a) Red, Blue, Green b) green red white c) black blue blue d) white green blue

COMPUTER SCIENCE UNIT 3

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