Abstract
Today, encrypting and decrypting data by looking up a table is quite popular and its processing speed is high. But currently, the table to be looked up is a static S-Box, the content of which is fixed and independent from its input string. In fact, its security can be enhanced by dynamically changing the table contents according to the input string. Basically, the table is unknown to hackers since they do not know the input string. On the other hand, encryption and decryption processes usually are accomplished by using control parameters, such as user’s passwords or channel keys. Based on this, in this study, we propose an algorithm, namely Generating a Dynamic Box by using Input String (GDBIS for short), which produces a 16 x 16 dynamic box (D-Box for short) according to user’s input string, the length of which should be longer than or equal to 8 bits, i.e., the length of one character. The GDBIS has three procedures with which to yield a D-Box. We also design a new key expansion algorithm, called Generation of D-Box and Round Keys (GDBRK for short), to substitute for the original key expansion algorithm of AES. According to our security analysis, the D-Box generated by GDBIS is irreversible with high degree of chaos and has excellent sensitivity on inputs. The Round Keys generated by the GDBRK have high degree of randomness and low relation among themselves. Our analysis also shows that the GDBIS and the GDBRK have excellent performance, able to meet the needs of practical applications.
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Liu, JJ., Huang, YL., Leu, FY., Pan, XY., Chen, LR. (2019). Generating Dynamic Box by Using an Input String. In: You, I., Chen, HC., Sharma, V., Kotenko, I. (eds) Mobile Internet Security. MobiSec 2017. Communications in Computer and Information Science, vol 971. Springer, Singapore. https://doi.org/10.1007/978-981-13-3732-1_2
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DOI: https://doi.org/10.1007/978-981-13-3732-1_2
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