The Security Signalling is the same as before.
References:
[1] 3GPP TS 36.331: Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource Control (RRC) Protocol
[2] 3GPP TS 36.413: Evolved Universal Terrestrial Access (E-UTRA) and Evolved Universal Terrestrial Access Network (E-UTRAN) ; S1 Application Protocol (S1 AP)
[3] 3GPP TS 24.301: Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)