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CREATION AND ANALYSIS OF THE MESSAGE AUTHENTICATION CODE BY USING KEY CHAINING

 

TITLE CREATION AND ANALYSIS OF THE MESSAGE AUTHENTICATION CODE BY USING KEY CHAINING.
AUTHOR PRASERT CHAROENRUNGREUNGDEE
DEGREE MASTER OF SCIENCE PROGRAMME IN COMPUTER SCIENCE
FACULTY FACULTY OF SCIENCE
ADVISOR DAMRAS WONGSAWANG
CO-ADVISOR SUKANYA PHONGSUPHAP
 
ABSTRACT
This research proposes an improved model, called Key Chaining MAC (KC-MAC), to solve the problem found in CBC-MAC. KC-MAC removes the weak exclusive-or of CBC-MAC so that an adversary is not allowed to choose any block to forge a message. To strengthen KC-MAC, key chaining is also added. The key chaining feature causes a secret key of the next block message to be changed dynamically, so it is harder to break KC-MAC generation. The prototype of the proposed model has been developed, implemented, tested and analyzed with the employment of Data Encryption Standard (DES). The MAC generation results show that KC-MAC can solve the problem found in CBC-MAC. The generating performance is almost the same for both methods. However, KC-MAC has more reliability and strength than CBC-MAC. The detail of KC-MAC has been presented and implemented. Its results have been discussed. Finally, improvements of the model have been suggested.
KEYWORD MESSAGE AUTHENTICATION CODE/ KEY CHAINING

 

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