●●●●● ●●●● ●●0 Encrypting ●●● ●●●● plaintext encrypted two letters at a time 1. if a pair is a repeated letter, insert a filler like 'x,e.g balloon "encrypts as"ba lx lo on 2. if both letters fall in the same row, replace each with letter to right ( wrapping back to start from end), e.g,"ar encrypts as " rm 3. if both letters fall in the same column, replace each with the letter below it (again wrapping to top from bottom), eg mu" encrypts to"cm 4. otherwise, each letter is replaced by the one that lies in its row and the column of the other plaintext letter, e. g hs"encrypts to"bp, and"ea"to"im COMP4690. HKBUCOMP4690, HKBU 20 Encrypting ⚫ plaintext encrypted two letters at a time: 1. if a pair is a repeated letter, insert a filler like ‘x', e.g., "balloon" encrypts as "ba lx lo on" 2. if both letters fall in the same row, replace each with letter to right (wrapping back to start from end), e.g., "ar" encrypts as "rm" 3. if both letters fall in the same column, replace each with the letter below it (again wrapping to top from bottom), eg. "mu" encrypts to "cm" 4. otherwise, each letter is replaced by the one that lies in its row and the column of the other plaintext letter, e.g., "hs" encrypts to "bp", and "ea" to " im