SECTELSecure Telephone
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DVI is widely used in Motorola Land Mobile Product radio systems and in a series of SECTEL telecommunications security products.
Motorola's SECTEL telephones, while they look like normal, full-feature business phones, are special in that they encrypt the transmission with a sophisticated mathematical "public key algorithm" that would take decades of computer time for an eavesdropper to decode -- and the code can be changed with each new message.
Robert Wade of Motorola's Secure Telecommunications office in Phoenix, where SECTEL phones originate, commented: "We appreciate the exposure that the CIA director is giving to this important business issue, but we would add that the domestic threat presented by the illegal eavesdropper, the accidentally overheard conversation or the misdirected fax is just as real.