In this paper, we proposed a method of secure transmission of voice data in public IP network. Traditional methods used for secure transmission, such as encryption, take up too much time in data encryption/decryption and key processing. We use visual cryptography and data sharing methods to reduce the effects caused by those problems. In addition, we utilize the disjoint multi-path routing algorithm to send voice data, so that we can reduce the occurrence of network hot-spot and decrease the transmission delays
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