Advantages

　　Complex encryption algorithms: Advanced encryption algorithms, such as AES, RSA, etc., are used to encrypt digital voice signals, which make the encrypted signals highly random and unpredictable, and it is difficult for eavesdroppers to obtain valid information from the intercepted signals.

　　Flexible key management: Complex key management can be realized, including key generation, distribution, storage and updating, etc. Through the secure key management system, it can ensure that only the authorized users have the correct key to decrypt and obtain the voice content, which greatly improves the confidentiality of communication.

　　Elimination of voice features:  In digital encryption, the smallest coding unit of the voice no longer has the characteristics of the voice signal, and it is difficult for eavesdroppers to obtain the contents of the call by analyzing the characteristics of the signal.

　　Strong anti-interference ability: digital signals have a strong anti-interference ability, in the transmission process by noise, interference and other factors have less impact, even if the signal has a certain degree of distortion or error, but also through the error correction coding and other technologies for recovery, to ensure that the clarity and integrity of the voice, so as to ensure the quality of the confidential communication.

　　Convenient signal processing: digital signals are convenient for various signal processing and transformation, such as compression, coding, modulation and other operations can be conveniently carried out, and can be better compatible with modern communication technologies and networks, applicable to a variety of communication scenarios, such as walkie-talkie communication, satellite communication, VoIP and so on.

　　Group encryption can be realized: it can encrypt both single-channel signals and group-channel signals, which improves the encryption efficiency and management convenience of the communication system, and is suitable for use in occasions requiring simultaneous processing of multiple voice channels, such as the internal communication system of large-scale enterprises and the military command communication network.

　　Good versatility: it can encrypt various types of voice messages, whether they are ordinary voice calls, or voice commands containing specific information, voice files, etc., all of which can be effectively encrypted, and can be combined with other digital encryption technologies or security measures to further enhance the security of communications.

　　Disadvantages

　　Complex equipment: digital voice security technology requires the use of complex digital signal processing equipment and encryption algorithm chips, involving analog-to-digital conversion, digital encryption, channel coding and other aspects, making the hardware and software design of communication tools are relatively complex, equipment development, production and maintenance costs are high.

　　Wide bandwidth: In order to ensure the quality of voice signals and the security of encryption, digital voice security technology usually needs to take up a wider bandwidth resources, especially in the use of some advanced coding and encryption algorithms, the bandwidth requirements are higher, which limits the capacity of the communication system to a certain extent and the utilization of the spectrum.

　　High transmission requirements: the transmission of digital signals requires high channel requirements, if the channel quality is not good, it may lead to an increase in the BER of the signal, affecting the quality of voice restoration, and may even lead to the failure of decryption, so it needs to have a good transmission channel and reliable transmission protocols to ensure the stability of communication.

　　Existence of computational delay: the encryption and decryption process requires complex mathematical operations, which may lead to a certain processing delay, especially when dealing with a large amount of voice data or using complex encryption algorithms, the delay problem may become more obvious, affecting the real-time nature of communication.