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Modern Internet Protocols support several modes of operation in encryption tasks for data confidentiality to keep up with varied environments and provide the various choices, such as multi-mode IPSec support. To begin with, the authors will provide a brief background on the modes of operation for symmetric-key block ciphers. Different block cipher modes of operation have distinct characteristics. For example, the Cipher Block Chaining (CBC) mode is suitable for operating environments that require self-synchronizing capabilities and the Output FeedBack (OFB) mode requires encryption modules only. When using symmetric-key block cipher algorithms such as the Advanced Encryption Standard (AES), users performing information encryption often encounter difficulties selecting a suitable mode of operation. This paper describes a structure for analyzing the block operation mode combination.
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