SECURE SPEECH SOLUTIONS -DIGITAL ENCRYPTION

Secure speech is defined as a method to protect the voice data from any interruption or eavesdropping operations which may occur during the call. Radio communication is being faced with many technical threats which may affect on the destination of the signal, especially with some devices which used an old generation of encryption system. The digital encryption is used as one of various types of speech encryption. (Voice Crypto, 2020) ''The Speech is first digitized using an Analog-to-Digital Converter (ADC) or a Vocoder The resulting digital data stream is then mixed using an XOR-operation with a data stream from a pseudo-random number generator (PRNG) This principle is also known as the Vernam Cipher. The resulting encrypted data stream that is then converted back to the analogue domain (modem), so that it can be transmitted.'' (Voice Crypto, 2020) The next simplified diagram is shown the process of digital encryption.

(Voice Crypto, 2020)

References:

Cryptomuseum.com. 2020. Voice Crypto. [online] Available at: <https://www.cryptomuseum.com/crypto/voice.htm> [Accessed 25 November 2020].

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