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Currently, commercial encrypted headset products are generally applying scrambling technology. However, no matter how complicated the scrambling solution is, “the residue of speech intelligibility” will be existed. That is, there will be a speech characteristic vulnerability that can restore the scrambled voices to the original voices without cryptographic algorithm cracking. All this has been proved that commercial encrypted headset products using scrambling technology will not be secure enough for encrypted calls.
By adopting AMSI digital modulation technology, VS-2020 can transmit high reliability data through voice compressed and coded channels (e.g. cellular calls, VoIP, etc.), and it’s the first headset product in the world to realize end-to-end encrypted communication by using digital voice encryption technology.
The process of VS-2020 is: compress and code the user’s speech first, then encrypt the coded data with high-strength cryptographic algorithm, modulate the encrypted digital stream to audio signal that is similar to the sound of fax Modem and send to the phone. Therefore, there will be no any speech intelligibility residue in the voice channels during the transmission of audio signal. Eavesdroppers can only decrypt the encrypted voices by cryptographic algorithm cracking. The security level of VS-2020 is totally determined by the adopted strength of cryptographic algorithm.
The cryptographic algorithm adopted by VS-2020 is fully compliant with the highest commercial security standards ：
■ key agreement algorithm: ECDH, dynamic key negotiation
■ speech cryptographic algorithm: AES256, CTR mode
VS-2020 adopts voice source encryption solution. Users’ voice has already been encrypted before sending to the phone devices, that can resist the risk of eavesdropping to the maximum extent, not only could prevent line eavesdropping from carriers, network, SS7, cellular interceptor, but also could prevent eavesdropping from mobile spywares, backdoors, etc.
|Applicable mobile phone models||iPhone7/8/X/11, Huawei Mate20/P30, Samsung S9/S10…|
|Supported cellular voice communications||GSM、UMTS、VoLTE|
|Signal requirements of encrypted call||GSM: >-90dB; UMTS: > -90dB; LTE (VoLTE): > -100dB|
|Supported VoIP communications||WhatsApp, Skype, Line, Facetime, Signal...|
|Speech coding rate of encrypted call||1.2kbps|
|Switching time of encrypted/normal call||<10s|
|playCryptographic algorithm||key agreement: ECDH;
data cryptographic algorithm: AES256, CTR mode
|Battery life||call duration: 2.5 hrs; standby time: 15 hrs|
|Indicator light||Power-on indication, Bluetooth status indication,
normal/encrypted call indication
|Dimensions||86mm * 52mm * 10mm; weight: 38g|
|External interface||3.5mm headset jack; Micro USB interface|
|Charging||5V 1A DC power adapter|
|Package||VS-2020 X 1; 3.5mm earphone X 1; USB cable X1; manual/warranty card|
Which phone models are supported?
VS-2020 supports iPhone7 or higher, and most of the Android smartphone with Qualcomm 845 , Kirin 970 or higher chipset.
Whether VS-2020 must be used in pairs?
Yes, both sides must use VS-2020 for encrypted calls. Otherwise, one side encrypts the voice, another side can’t decrypt it.
Is it possible to make encrypted calls via cellular voice communications anywhere in the world?
Yes, but you need to select carriers who support GSM (using EFR or AMR speech coding), UMTS or VoLTE. VS-2020 can not be used under CDMA or CDMA2000 network. In addition, for roaming and international long-distance calls, the effect of encrypted calls can not be guaranteed due to the different technical standards adopted by different carriers, as well as the possible problem caused by speech transcoding.
Which VoIP applications are supported?
Frankly speaking, there are too many VoIP applications to be tested one by one. Generally, VoIP applications with good voice quality can support encrypted calls. Here are some common VoIP applications that have been proven to work, such as Facetime, WhatsApp, Line, Skype … For other VoIP applications, you need to test and discover them yourself.