Fundamentals of Information Encryption - Multilevel Security for Relational Databases - page 87

I 0 = IV E K I 1 E K I 2 E K I 3

P 1 P 2 P 3

C 1 C 2 C 3

Figure 4.16 Using a block cipher in the OFB mode.

plaintext block results in different ciphertext blocks. Figure 4.16
shows the OFB mode. The encryption algorithm is

C j = P j ⊕ I j (4.14)

and the decryption algorithm is

P j = C j ⊕ I j (4.15)

I j = E K ( I j −1 ), j = 1, 2, 3, … (4.16)

I 0 = IV (4.17)