C8051F960-B-GM Datasheet, PDF (190/492 Pages) Silicon Laboratories – Ultra Low Power 128K, LCD MCU Family

C8051F96x
14.6. Block Cipher Modes
14.6.1. Cipher Block Chaining Mode
The Cipher Block Chaining (CBC) Mode algorithm significantly improves the strength of basic AES encryp-
tion by making each block encryption be a function of the previous block in addition to the current Plaintext
and key. This algorithm is shown inFigure 14.4
Plain Text
Plain Text
Initialization Vector (IV)
XOR
XOR
Encryption
Encryption
Key
Encryption
Cipher
Encryption
Key
Encryption
Cipher
Cipher Text
Cipher Text
Cipher Text
Cipher Text
Decryption
Decryption
Key
Decryption
Cipher
Decryption
Key
Decryption
Cipher
Initialization Vector (IV) XOR
XOR
Plain Text
Plain Text
Figure 14.4. Cipher Block Chaining Mode
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