To communicate the word "hello", the cipher would be the following (with the pause between each number in a pair being shorter than the pause between letters): The listener only needs to discriminate the timing of the taps to isolate letters. For example, to specify the letter "B", one taps once, pauses, and then taps twice. The tap code is based on a Polybius square using a 5×5 grid of letters representing all the letters of the Latin alphabet, except for K, which is represented by C.Įach letter is communicated by tapping two numbers, the first designating the row and the second (after a pause) designating the column. The method of communicating is usually by tapping either the metal bars, pipes or the walls inside a cell. The tap code has been commonly used by prisoners to communicate with each other. The message is transmitted using a series of tap sounds, hence its name. The tap code, sometimes called the knock code, is a way to encode text messages on a letter-by-letter basis in a very simple way. What will be the encrypted text corresponding to plain text “SAN” using standard polybius square cipher?Ĭlarification: For encrypting using polybius square cipher we have to use the table which is shown below and write (row, col) coordinates corresponding to each letter.ġ2.Encoding for text messages Latin alphabet tap code table So in this case the plain text is found to be “CSK”.ġ1. What will be the plain text corresponding to ciphered text “134325” if standard polybius square cipher is used for encryption?Ĭlarification: For decoding ciphered text we have to use the polybius square in and find out the letters corresponding to each pair of coordinate. It uses a 6 X 6 version of polybius square.ġ0. Which of the following cipher uses polybius square cipher in its first step of encrypting data?Ĭlarification: ADFGVX cipher uses polybius square cipher in its first step of encrypting data. Thus it is quite vulnerable to frequency analysis much like any other mono alphabetic cipher.ĩ. Polybius square cipher is less susceptible to frequency analysis.Ĭlarification: Polybius square cipher is closely related to mono alphabetic cipher. Whereas polybius square being a poly alphabetic cipher is less vulnerable to frequency analysis and so is more secure.Ĩ. Auto key cipher is more secure than polybius square cipher?Ĭlarification: Polybius square is closely related to mono alphabetic substitution cipher and thus is more vulnerable to frequency analysis. Which two English letters are usually combined in polybius table?ħ. It is because it applies a fixed substitution to the letters present in plain text.Ħ. Polybius square cipher is most closely related to?Ĭlarification: Polybius square cipher is much like any mono alphabetic cipher. Usually, I and J are combined so as to fit all English letters in this table.ĥ. What is the usual size of polybius square used for encrypting English alphabets?Ĭlarification: The usual size of poybius square for encrypting English alphabets is 5 X 5. Polybius square allows us to cipher the plain text in such a way that a minimum number of symbols are used in the encrypted text.Ĥ. Which of the following is made possible by the use of Polybius square?Ī) To represent the plain text by smaller set of symbolsī) To represent the plain text by larger set of symbolsĬ) To represent the plain text by the letters of some other languageĭ) To represent the plain text by the same set of symbolsĬlarification: Polybius square is similar to substitution cipher. One is known as public key whereas other is called private key.ģ. How many keys are required for encryption and decryption of data when we use asymmetric cipher?Ĭlarification: Asymmetric cipher makes use of 2 keys for the purpose of encryption. It is also known by the name of Polybius checkboard.Ģ. Polybius square is also known by the name of?Ĭlarification: Polybius square is similar to substitution cipher. Data Structures & Algorithms Multiple Choice Questions on “Polybius Square”.ġ.
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