Section: 6.5.2 RRC confidentiality mechanisms
Content: RRC confidentiality protection is provided by the PDCP layer between UE and gNB. The use and mode of operation of the 128-NEA algorithms are specified in Annex D. The input parameters to the 128-bit NEA algorithms as described in Annex D are a 128-bit cipher Key KRRCenc as KEY, a 5-bit bearer identity BEARER which corresponds to the radio bearer identity, the 1-bit direction of transmission DIRECTION, the length of the keystream required LENGTH and a bearer specific direction dependent 32-bit input COUNT which corresponds to the 32-bit PDCP COUNT.