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Facepalm: Not for the first time, digital billboards have been hacked to play pornography. On this occasion, however, the incident took place on a global scale as the explicit footage appeared on public signage in multiple countries. A group claiming responsibility says the hack was so easy that "anyone with two brain cells" could have done it.

The most visible hack took place on a digital billboard stretching across one of Egypt's biggest highways: the 26th of July Axis in Giza. Drivers stopped their cars to film as the screen broadcast the adults-only material, which was overlaid with the text "Leaked by: Ch, 19ylegal never and nivex" and the Telegram handle @LeakersGov.

According to CNN , Egypt's Interior Ministry blamed a cyberattack on the website of an unnamed international company contracted by the billboard's operator.…