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Okay, so this really seems like an homework question to me, so I am going to try to help you with a hint instead of serving the answer hot on a plate. If my assumption about it being a homework question is wrong, then I apologise but the following hint will help you out anyway. Usually the cipher text in El Gamal is of the form $c=(c1,c2)$, where $c1 = g^{...


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This got me wondering in general if key sizes are flexible depending on "how long the encryption needs to last" - are there any guidelines here? Any pitfalls I'm not considering? Yes, you can down-scale the bit-length, e.g. to 1536-bit and it will still likely stay somewhat secure. But do note that for discrete-logarithm over finite fields based ...


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