Which of the following was the first diagram substitution cipher?(a) autokey cipher(b) hill cipher(c) one time pad cipher(d) playfair cipherI have been asked this question by my school teacher while I was bunking the class.My question is from Cryptography in section Cryptography of Data Structures & Algorithms II

Which of the following was the first diagram substitution cipher?(a) a

1.	Which of the following was the first diagram substitution cipher?(a) autokey cipher(b) hill cipher(c) one time pad cipher(d) playfair cipherI have been asked this question by my school teacher while I was bunking the class.My question is from Cryptography in section Cryptography of Data Structures & Algorithms II
Answer» Right choice is (d) playfair cipher For explanation: Poly GRAPHIC cipher is a TYPE of substitution cipher in which substitution is performed over a BLOCK of LETTERS. In diagram substitution, two adjacent letters are SUBSTITUTED simultaneously. Playfair cipher was the first diagram substitution cipher.

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