Collaborate Disseminate
Those who haven’t experienced the destruction of a house fire should consider themselves lucky. The speed with which fire can erase a lifetime of work — or a life, for …read more Continue reading Retrotechtacular: Rebuilding a Fire-Ravaged Telephone Exchange
It doesn’t happen often, but every once in a while we stumble upon someone who has taken obsolete but really cool phone-switching equipment and built a private switched telephone in …read more Continue reading Homebrew Telephone Exchange Keeps the Family in Touch, in the House and Beyond
Anyone who was active in the phreaking scene or was even the least bit curious about the phone system back in the Ma Bell days no doubt remembers the carbon capsule microphone in the mouthpiece of many telephone handsets. With carbon granules sandwiched between a diaphragm and a metal plate, …read more
Continue reading Wood and Carbon Rods Used for This Handsome and Effective Microphone
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The post ShowMeCon 2018, Paul Coggin’s ‘SS7 for INFOSEC’ appeared first on Security Boulevard.
Continue reading ShowMeCon 2018, Paul Coggin’s ‘SS7 for INFOSEC’
The mid-1980s were a time of drastic change. In the United States, the Reagan era was winding down, the Cold War was heating up, and the IBM PC was the newest of newnesses. The comparatively few wires stitching together the larger university research centers around the world pulsed with a new heartbeat — the Internet Protocol (IP) — and while the World Wide Web was still a decade or so away, The Internet was a real place for a growing number of computer-savvy explorers and adventurers, ready to set sail on the virtual sea to explore and exploit this new …read more
One late night many decades ago, I chanced upon a technical description of the Touch-Tone system. The book I was reading had an explanation of how each key on a telephone sends a combination of two tones down the wire, and what’s more, it listed the seven audio frequencies needed for the standard 12-key dial pad. I gazed over at my Commodore 64, and inspiration hit — if I can use two of the C64’s three audio channels to generate the dual tones, I bet I can dial the phone! I sprang out of bed and started pecking out a …read more
Continue reading In-Band Signaling: Dual-Tone Multifrequency Dialing
