97 Lumina LS, 198,500 miles.

The engine won't start when I turn the key, but all the electircal systems come on just fine including lights and radio. At first it only did this in the rain or when it was very wet/humid, but now this is a common occurence and is becoming more frequent. My 'security' light came on recently as well. Any ideas? Thank you.

Bad ICM or crank position sensor maybe?