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Encrypt "This is the final exam" with Playfair cipher using key "Guidance". Explain the steps involved.
1 Answer
written 5.5 years ago by | • modified 3.1 years ago |
G | U | I/J | D | A |
---|---|---|---|---|
N | C | E | B | F |
H | K | L | M | O |
P | Q | R | S | T |
V | W | X | Y | Z |
The cipher uses three rules of encryption.
$P=P_{1} P_{2} P_{3} \qquad C=C_{1} C_{2} C_{3}$ $k=\left[\left(k_{1}, k_{2}\right)\left(k_{3}, k_{4}\right)\right]$
encryption : Ci = Ki Decryption : Pi = Ki
Thus
plaintext: " This is the final exam "
cipher : th is th ef in al ex am
Ciphertent by using all rules
'Th' = OP ..... by rule 3
'is' = DR ...... by rule 3
'ef = BN ..... by rule 2
'in' = FG ..... by rule 3
'al' = IO ..... by rule 3
'ex' = LI ...... by rule 2
'am' = DO ..... by rule 3
Thus