Why Security Should be Activated to Initiate RRC Connection Re-establishment? [CLOSED]

Question

Upon detecting Radio Link Failure UE will do RRC Connection re-establishment but to do RRC Connection re-establishment security should be activated in UE, otherwise UE will go Idle mode.So here(After detecting RLF) we are resetting all PHY,MAC,RLC,PDCP Configurations but why we are making security should be there to do RRC Connection re-establishment.

Answer 1

RRC Connection re-establishment request message come to eNodeB though common channel CCCH.
To verify whether genuine UE has sent RRC Connection Re-establishment request or some fake UE has sent the message.
That is the reason what I think RRC Connection Re-establishment procedure is considered once the security is activated.