Kryptotel fz llc

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Kryptotel - Encrypted Voip
Free
Kryptotel allows to make ENCRYPTED VOIP calls.
Android
Kryptotel - Secure Voip
Paid
Kryptotel is an open source application to make ENCRYPTED VOIP calls.It does use the RSA 4096 bits and TLS protocol to encrypt the signals...
iOS