x.com/TheMindScourge/status/2102735345582256504
2 corrections found
AT&T shifted over to a different system, and phreaking came to an end
AT&T’s network change killed classic blue-box/in-band exploits, but phreaking itself did not end. Phone-phreak publications and law-enforcement cases continued well into the late 1980s and 1990.
Full reasoning
This overstates what happened.
AT&T did replace vulnerable in-band signaling with Common Channel Interoffice Signaling (CCIS) and later SS7-style common-channel signaling. That change did break the classic blue-box method. Bell/AT&T literature describes CCIS as a new signaling system introduced into the Bell System toll network and later traces the CCS network back to its initial deployment in 1976.
But that is not the same as saying "phreaking came to an end." The historical record shows phreaking continued after the signaling transition:
- The official Phrack archives show the magazine began in 1985, years after CCIS deployment, and its early issues still contained explicit phone-phreak material such as "The Fone Phreak's Revenge", "Phreak World News", and other telecom-system articles.
- An EFF account from 1990 documents Secret Service action against "Acid Phreak" and quotes a federal statement describing an ongoing progression of crimes including "telecommunications fraud (free long distance phone calls)." That is direct evidence that phone-phreak activity was still active in 1990.
So the accurate version is: AT&T's signaling redesign ended a major class of phreaking techniques, especially blue-boxing, but it did not end phreaking as a whole.
3 sources
- Common Channel Signaling Network Evolution
This paper traces the evolution of the AT&T common channel signaling (CCS) network from its initial deployment as the common channel interoffice signaling (CCIS) network in 1976 to its present and future forms.
- Phrack Inc. Newsletter 25th Issue Anniversary Index
From November 17, 1985 to March 29, 1989... Phrack 1 (November 17, 1985)... 'The Fone Phreak's Revenge'... later issues include 'Phreak World News' and multiple telecom/phreaking topics.
- Crime and Puzzlement
On January 24, 1990, a platoon of Secret Service agents entered the apartment which Acid Phreak shares with his mother... [and the Secret Service statement describes] telecommunications fraud (free long distance phone calls).
it never considered that the system could be hacked.
Bell engineers had explicitly considered the risk that in-band control signals could be imitated from the voice path. Bell’s own technical literature discusses protections against “voice-generated” and “speech-imitated” signals.
Full reasoning
Bell's own engineering literature shows this was not something AT&T/Bell had "never considered."
In a 1960 Bell System Technical Journal paper on signaling systems, Bell engineers explicitly discussed the problem of "signal imitation due to noise or voice-generated signals" in in-band signaling. The paper also explains that Bell used "signal-to-guard arrangements" and timing protections to prevent "speech-generated" and "speech-imitated" signals from falsely operating the network.
That means the Bell System had already recognized a core security issue of in-band signaling: tones traveling over the same voice channel could be imitated from the audio path and trigger unwanted control behavior. The later success of blue-boxing showed those protections were not sufficient, but it is inaccurate to say AT&T/Bell never considered the possibility at all.
2 sources
- The Bell System Technical Journal (November 1960)
Bell engineers wrote that in-band signaling needed protection against "speech-generated signals" and used "signal-to-guard arrangements" to reduce "speech-imitated signals."
- Signaling Systems (Bell System Technical Journal mirror)
The paper states that in-band signaling faced "signal imitation due to noise or voice-generated signals," showing Bell had considered false or imitated control signals.