LTE Security Architecture

LTE security architecture defines the security mechanism for both NAS layer and AS layer. No HO related security is covered in this document. LTE Security Distribution NAS security Carried out for NAS messages and belongs to the scope of UE and MME. In this case NAS message communication between UE and MME are Integrity protected and Ciphered with extra NAS security header. AS security Carried out for RRC and user plane data and belongs to the scope of UE and eNB. PDCP layer in UE and eNB side is responsible for the ciphering and integrity protection. RRC messages are integrity protected and ciphered but U-Plane data is only ciphered. Different Security algorithms (integrity/ciphering) Integrity “0000″ EIA0 Null Integrity Protection algorithm “0001″ 128-EIA1 SNOW 3G “0010″ 128-EIA2 AES Ciphering “0000″ EEA0 Null ciphering algorithm “0001″ 128-EEA1 SNOW 3G based algorithm “0010″ 128-EEA2 AES based algorithm   Pre Shared Keys UE Security [...]

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