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The correct choice is (B) poly-alphabetic cipher

Easiest explanation - VIGENERE cipher is a substitution cipher. It falls under the category of poly alphabetic cipher as it USES MULTIPLE substitution at different positions in order to cipher the plain text.

Right answer is (c) an algorithm that performs encryption or decryption

Easy explanation - Cipher is an algorithm for PERFORMING encryption or decryption. In CRYPTOGRAPHY, a set of defined STEPS are followed to generate ciphers. These are NECESSARY to prevent data BREACH.

The CORRECT option is (C)both can be cracked USING frequency analysis

Both affine CIPHER and pigpen cipher can be broken using frequency analysis. Pigpen cipher is an example of a geometric substitution cipher.

The CORRECT option is (a) _| |_ >

The explanation is: Pigpen CIPHER replaces LETTERS of the plain text with corresponding SYMBOLS. These symbols are FRAGMENT of a grid.

The CORRECT option is (a) True

The best explanation: Vigenere cipher is more secure as COMPARED to pigpen cipher. It is because pigpen cipher is GEOMETRIC substitution cipher and vigenere cipher is POLY alphabetic substitution cipher.

Correct choice is (a) MONO ALPHABETIC substitution CIPHER

For explanation: Pigpen cipher ENCRYPTS the plain text by replacing each letter with a corresponding symbol. Pigpen cipher is an example of geometric substitution cipher.

Correct option is (d) pigpen cipher

To explain: Pigpen cipher is the weakest cipher out of the GIVEN options. This is because it is a simple GEOMETRIC substitution cipher so can be EASILY cracked using frequency ANALYSIS.

The correct answer is (C) Pigpen cipher

The best explanation: Pigpen cipher is BELIEVED to be USED by freemasons in the 18th century. Pigpen cipher is an example of GEOMETRIC substitution cipher.

Right option is (d) pigpen cipher

The explanation is: Pigpen cipher encrypts the PLAIN text by replacing each LETTER with a corresponding SYMBOL. Pigpen cipher is an EXAMPLE of geometric substitution cipher.

Correct answer is (d) ANFRSUNDOY

The best explanation: For ENCRYPTING using columnar cipher we have to arrange the letters of the plain text in a table which has the same number of columns as the letters of the keyword. Then the letters of the keyword are arranged in ALPHABETICAL order and we read ALONG each column.

3 1 4 2 5

G A M E S

S A N F O

U N D R Y

So the ciphered text will be “ANFRSUNDOY”.

Correct CHOICE is (a) SNONRAFUDY

Easy explanation - For encrypting a plain text using rail FENCE CIPHER we use a table having a NUMBER of rows equal to key value as shown below. Then we read along the rows to get the CIPHERED text. So the ciphered text will be “SNONRAFUDY”.

Right option is (b) COLUMNAR transposition cipher

For explanation: In transposition cipher, the letters remain same in ciphered and plain text. Their POSITION is only changed whereas in substitution cipher the letters become different in encrypted text. So columnar transposition cipher will be the CORRECT option.

The correct choice is (c) transposition CIPHER

Easiest EXPLANATION - Route cipher is a transposition cipher. It falls under the category of transposition cipher as it ENCRYPTS the PLAIN TEXT by rearranging its letters.

The CORRECT option is (d) hill CIPHER

The best explanation: In mono alphabetic cipher each symbol of plain text is replaced by a particular respective symbol in the cipher text. There are THREE types of mono alphabetic CIPHERS- additive, MULTIPLICATIVE and affine.

Correct choice is (c) One TIME pad cipher

Best explanation: Out of the given options only One time pad cipher is not a TYPE of TRANSPOSITION cipher. It is a type of SUBSTITUTION cipher.

Right CHOICE is (b) transposition cipher

The best explanation: TYPES of traditional ciphers- Transposition and SUBSTITUTION cipher. In transposition cipher the letters of the GIVEN message are shuffled in a particular order, fixed by a given rule.

Right CHOICE is (c) an algorithm that PERFORMS encryption or DECRYPTION

Explanation: Cipher can be defined to be an algorithm that performs encryption or decryption. In cryptography, a SET of defined steps are followed to generate CIPHERS.

Correct choice is (d) JZE

To explain: Hill cipher is a type of poly ALPHABETIC substitution. It uses a n x n MATRIX in ORDER to cipher the given plain text. USING this method we find the ciphered text to be JZE.

Correct choice is (c) ZEYQCBROCM

Explanation: Vigenere cipher is a type of poly ALPHABETIC substitution which uses vigenere table for making substitutions in the plain text. USING the table we FIND the solution to be ZEYQCBROCM.

The CORRECT CHOICE is (b) hill cipher

The BEST I can explain: In transposition cipher and mono alphabetic cipher the number of LETTERS remains the same in ciphered and deciphered text. But in poly alphabetic cipher the number of letters are different. So here as hill cipher is the only poly alphabetic cipher so it will be the ANSWER.

Correct option is (a) true

Explanation: Mono alphabetic ciphers can be decoded by using the method FREQUENCY analysis. But in poly alphabetic cipher each symbol of PLAIN TEXT is replaced by a DIFFERENT cipher text regardless of its OCCURRENCE. This makes it very difficult to be decoded by using frequency analysis.

The CORRECT choice is (b) TRANSPOSITION cipher

The BEST explanation: There are TWO types of a TRADITIONAL cipher. First is transposition cipher and the second is substitution cipher.

Right ANSWER is (d) Affine cipher

Easiest explanation - In poly alphabetic cipher each SYMBOL of plain text is replaced by a DIFFERENT cipher text regardless of its occurrence. Out of the GIVEN options, only affine cipher is not a poly alphabetic cipher.

Right option is (a) a substitution based cipher which uses multiple substitution at DIFFERENT POSITIONS

The best I can EXPLAIN: POLY alphabetic cipher is a type of substitution cipher. It uses multiple substitution at different positions in order to cipher the plain text.

Correct option is (a) poly ALPHABETIC cipher

Easiest EXPLANATION - In substitution cipher the plain text is REPLACED by cipher text ACCORDING to a FIXED rule. There are two types of substitution cipher- Mono alphabetic and Poly alphabetic cipher.

Right choice is (B) rail fence CIPHER

Explanation: There are two types of traditional ciphers- Transposition and substitution cipher. In transposition cipher the letters of the GIVEN data are shuffled in a PARTICULAR order, fixed by a given rule. Rail fence cipher is an example of transposition cipher.

The correct choice is (C) an algorithm that performs encryption or decryption

The BEST I can EXPLAIN: Cipher is an algorithm for PERFORMING encryption or decryption. In cryptography, a set of defined steps are followed to generate ciphers. These are necessary to PREVENT data breach.

The correct choice is (B) vigenere cipher

Easy explanation - In transposition cipher and MONO alphabetic cipher the number of letters in the plain text and CIPHERED text REMAIN same. But in poly alphabetic cipher the number of letters change. So here as vigenere cipher is the only poly alphabetic cipher so it will be the answer.

Right choice is (a) Rail FENCE cipher

The best I can explain: In transposition cipher the letters of the given data are shuffled in a particular order, FIXED by a given rule. There are two TYPES of transposition cipher – Rail fence cipher and Columnar transposition cipher.

Right option is (a) SCMBNUMERY

The BEST EXPLANATION: Keyword cipher is type of mono alphabetic cipher. In this algorithm the letters {A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z} by

{C,O,D,E,A,B,F,G,H,I,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z} respectively.

The correct choice is (d) Additive cipher

To explain: In poly alphabetic cipher each SYMBOL of plain text is replaced by a different cipher text regardless of its OCCURRENCE. Out of the given OPTIONS, only additive cipher is not a poly alphabetic cipher.

Right answer is (d) hill CIPHER

Explanation: In mono alphabetic cipher each symbol of PLAIN text is replaced by a PARTICULAR respective symbol in the cipher text. There are three types of mono alphabetic ciphers- additive, MULTIPLICATIVE and affine.

The correct CHOICE is (a) Mono alphabetic CIPHER

Easy EXPLANATION - In substitution cipher the plain text is replaced by cipher text according to a fixed rule. There are TWO types of substitution cipher – Mono alphabetic and POLY alphabetic cipher.

Right answer is (b) transposition CIPHER

Easy explanation - There are two types of traditional ciphers – Transposition and substitution cipher. In transposition cipher the LETTERS of the given data are shuffled in a PARTICULAR order, FIXED by a given RULE.

The correct OPTION is (b) TRANSPOSITION cipher

To explain: There are two types of a traditional cipher. First is transposition cipher and the SECOND is SUBSTITUTION cipher.

Right choice is (c) an ALGORITHM that performs encryption or DECRYPTION

Easiest explanation - Cipher is an algorithm for PERFORMING encryption or decryption. In cryptography, a set of defined steps are followed to generate ciphers.