Decrypt the message baab using this cipher

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Reference no: EM132122289

Question :

For the remaining questions, consider a 4-bit block cipher, described in hexadecimal by the following table:

Plaintext	Ciphertext	Plaintext	Ciphertext
0	a	8	e
1	c	9	d
2	f	a	0
3	6	b	7
4	3	c	5
5	8	d	b
6	4	e	9
7	2	f	1

You can think of this as a simple substitution cipher for hexadecimal digits. There is no "key" other than the table itself.

Encrypt the 4-block message face using this cipher for each digit individually.

Decrypt the message baab using this cipher.

Why is it insecure to use a block cipher in this way?

Reference no: EM132122289

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