I am normally flying to/from Cairo - last time beginning of May. All camera gear (ie. housing, lenses, strobes, ports, lights, dive computer etc apart from arms/clamps) was in hand luggage but had to put the laptop and camera body in hold. Though camera was on advice of the check-in person. As it turned out security was not bothered at all as quite a few people had cameras with them. Batteries are a hit and miss - normally I carry both camera and AA ones in hand luggage but on one occasion they made a fuzz about AA ones, on the 2nd security check right before boarding...luckily flight security guy was kind enough to "hold" them for the flight duration and return on landing, otherwise they would have binned them.
That said, Hurghada might be easier, as it is seen more as a tourist airport, they are usually stricter in Cairo...lately they even X-Ray your luggage on the way out, after landing, looking for any electronic devices - but I believe this one is more to stop people bringing stuff for sale without paying custom duties.
Have fun - Egypt is great for diving, now that the hordes of divers have departed, so one does not dive with 500 divers at once
And don't forget to encrypt your laptop...in case it goes "missing".
Edited by makar0n, 13 August 2017 - 12:27 PM.