Research On AAC Audio Encryption Algorithm And Its Application In VoIP

With the advent of the network age,the development of smart phones,and the continuous reduction of flow costs,Voice over Internet Protocol have developed rapidly,and various voice call frameworks are emerging in endlessly.However,because this kind of Voice over Internet Protocol is based on the IP network,and the network transmission is complicated and there are many uncontrollable factors,this means that the security of voice data during network transmission cannot be guaranteed,such as the risk of being intercepted by a third party.When people's communication involves some personal privacy or information that needs to be kept secret,Voice over Internet Protocol are no longer an option for people.Due to security issues,the development of Voice over Internet Protocol is subject to certain restrictions.Based on this background,a large number of researchers began to conduct various studies on the security of Voice over Internet Protocol.Some existing audio data encryption algorithms have some limitations in encryption efficiency or key security.Based on this situation,proposes a AAC audio encryption algorithm based on the idea of content association key.Using the audio coding format,combined with the content-associated key concept,the information that needs to be protected is divided into decoding key information and partial compressed data.And according to the characteristics of decoding key information and some compressed data,a corresponding extraction algorithm is designed.Decoding key information,partial compressed data,compressed data extraction location and compressed data extraction length obtained by extraction algorithm are formed into a key file according to the designed key format.At the same time,experiments and results analysis are carried out for the security,encryption effect and efficiency of the encryption algorithm,and the results show that the encryption algorithm has good effects on the encryption effect,security and efficiency.Using the above-mentioned AAC audio encryption algorithm,an encrypted voice call system is designed and implemented on the iOS platform to provide users who use the system with an encrypted voice call function.The test results show that the functions designed for the encrypted voice call system are basically realized.According to the characteristics of the encrypted voice call system,the connection rate,call quality,and packet loss rate are tested.The test results show that the system can achieve encrypted voice.The security and stability required by the call system.