It sounds like the pats security system does not recognise your key, have you tried your spare key? or you may have a problem with the key transponder module or key antennae around the ignition barrel. or one of the modules on the can network, your car really needs to go on suitable diagnostic equipment to help sort it out. hope this helps.
If the security light is flashing that means the car does not see the chip in the key.
Either the chip in the key is missing or broken.
Or
The antenna ring around the ignition lock has gone bad or been broken.
You can take the key to a locksmith and they can tell you if the chip in the keys is there and operating OK.
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