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A Study on the design of voice cryptograph system  

Choi, Tae-Sup (School of Electrical Engineering, Kookmin University)
Ahn, In-Soo (Dept. of Electronics Engineering, Bucheon College)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TE / v.39, no.2, 2002 , pp. 51-59 More about this Journal
Abstract
In this paper, we studied the voice cryptograph system designed by the SEED algorithm for the safe transmission and receipt on the voice communication. Voice band signal converts to digital signal by the CODEC and DSP that applied the improved SEED algorithm encrypt the digital signal. The CODEC convert Encryption signal into analog voice signal. This voice signal is transmitted safely because of encryption signal even if someone wiretap. Receiver can hear the source voice, because the encryption signal decrypted using the SEED algorithm. In this paper, We designed the 32 round key instead of 16 round key in the SEED algorithm so that we improve the truncated differential probability from $2^{-143.1}$ to $2^{-286.6}$. 
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