Healthc Inform Res.  2010 Mar;16(1):22-29. 10.4258/hir.2010.16.1.22.

A Selective Encryption Algorithm Based on AES for Medical Information

• Oh JY
• Yang DI
• Chon KH

• KMID: 2166562
• DOI: http://doi.org/10.4258/hir.2010.16.1.22

Abstract

OBJECTIVES
The transmission of medical information is currently a daily routine. Medical information needs efficient, robust and secure encryption modes, but cryptography is primarily a computationally intensive process. Towards this direction, we design a selective encryption scheme for critical data transmission. METHODS: We expand the advandced encrytion stanard (AES)-Rijndael with five criteria: the first is the compression of plain data, the second is the variable size of the block, the third is the selectable round, the fourth is the optimization of software implementation and the fifth is the selective function of the whole routine. We have tested our selective encryption scheme by C++ and it was compiled with Code::Blocks using a MinGW GCC compiler. RESULTS: The experimental results showed that our selective encryption scheme achieves a faster execution speed of encryption/decryption. In future work, we intend to use resource optimization to enhance the round operations, such as SubByte/InvSubByte, by exploiting similarities between encryption and decryption. CONCLUSIONS: As encryption schemes become more widely used, the concept of hardware and software co-design is also a growing new area of interest.

Keyword

Encryption/Decryption; AES; Medical Informatics

MeSH Terms

Medical Informatics

Figure

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  Figure 1 Encryption structure of the advandced encrytion stanard algorithm.

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  Figure 2 SubBytes transformation.

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  Figure 3 ShiftRow transformation.

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  Figure 4 MixColumns transformation.

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  Figure 5 AddRoundKey transformation.

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  Figure 6 RoundKey generation.

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  Figure 7 Architecture of selective encryption algorithm.

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  Figure 8 Block size vs. execution time.

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  Figure 9 Processing time of encryption and decryption of sample text.

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  Figure 10 Processing time of encryption and decryption of complex text.

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  Figure 11 (A) Processing time of encryption/decryption of image before compression. (B) Processing time of encryption and decryption of image after compression.

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