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When encrypting a message using a 3 x 3 Hill cipher key matrix, how should the plaintext message be prepared? 1 8 a . Divided
When encrypting a message using a x Hill cipher key matrix, how should the plaintext message be prepared?
a
Divided into triplets of letters
b
Divided into pairs of letters
c
None of these
d
Divided into quadruples of letters
e
Written as a single string
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