Secure transmission over satellite phone network
First Claim
1. A secure communications terminal, comprising:
- a satellite phone comprising a data port;
an encryption device; and
a modem to satellite phone interconnect board to capture a Dial Tone Modulation Frequency (DTMF) tone, demodulate V.34 encrypted modem information received from said encryption device, and convert said DTMF tone and said demodulate V.34 encrypted modem information into an ASCII string, said ASCII string being presented out-of-band with respect to said DTMF tone to said satellite phone data port.
2 Assignments
0 Petitions
Accused Products
Abstract
A reach back secure communications terminal includes a modem to satellite interconnect board that captures DTMF tones, demodulates encrypted modem information, and converts both into an ASCII string for presentation to a data port of a satellite phone, allowing out-of-band control of a non-secure satellite system (e.g., AT command control of a data port) by a user on a secure side of an encryption device, by including the ability to interpret control signals and control the satellite system appropriately. A false dial tone is presented to the encryption device, and the data stream coming from the encryption device is monitored for the presence of dual-tone, multi-frequency (DTMF) tones representing control signals, the DTMF tones are converted to ASCII characters, which are in turn received as control signals by the satellite phone, allowing control of the functions of the satellite system directly from the secure side of the encryption device.
29 Citations
16 Claims
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1. A secure communications terminal, comprising:
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a satellite phone comprising a data port; an encryption device; and a modem to satellite phone interconnect board to capture a Dial Tone Modulation Frequency (DTMF) tone, demodulate V.34 encrypted modem information received from said encryption device, and convert said DTMF tone and said demodulate V.34 encrypted modem information into an ASCII string, said ASCII string being presented out-of-band with respect to said DTMF tone to said satellite phone data port. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of providing secure communications over a non-secure data network, comprising:
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capturing a Dial Tone Modulation Frequency (DTMF) tone; demodulating V.34 encrypted modem information received from an encryption device; converting said DTMF tone and said demodulate V.34 encrypted modem information into an ASCII string; and presenting said ASCII string out-of-band with respect to said DTMF tone to a data port of a satellite phone. - View Dependent Claims (8, 9, 10, 11)
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12. Apparatus for providing secure communications over a non-secure data network, comprising:
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means for providing a false dial tone to an encryption device; means for capturing a Dial Tone Modulation Frequency (DTMF) tone; means for demodulating V.34 encrypted modem information from a modem; means for converting said DTMF tone and said demodulate V.34 encrypted modem information into an ASCII string; and means for presenting said ASCII string to a data port of a satellite phone. - View Dependent Claims (13, 14, 15, 16)
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Specification