Cryptology For Beginners - Playfair Cipher

When using the Playfair cipher, how many rules must you follow in order to Encode and Decode correctly?

• 1

• 2

• 3

• 4

In this table, what was the keyword used to encrypt?

• SUMMER

• PLAYFAIR

• CRYPTO

• SECRET

Using a playfair cipher with the keyword, KEYWORD (*Omit Q), >ENCODE> the following message:

"PLAYFAIR CIPHERS ARE FUN."

Using a playfair cipher with the keyword, MYSTERY (*Omit Q), <DECODE< the following message:

"TL XR AB RO DJ SI HT IX JD."

On a separate sheet of paper create a 5x5 Playfair Table (*Omit Q), and >ENCODE> a message of your choosing.

Please provide your keyword/phrase.