Why is it not practical to use an arbitrary reversible substitution cipher of the kind shown in Table 4.1?
Table 4.1:Encryption and Decryption Tables for Substitution Cipher of Figure 4.2 in text book.
Plaintext |
Ciphertext |
0000 |
1110 |
Ciphertext |
Plaintext |
0000 |
1110 |
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