name: EEA
full_form: EPS Encryption Algorithm
context: this partly ciphered initial layer 3 message. In the other hand, the generation of the key stream is another issue that should be considered. The method can be as following: the key stream used for partly ciphering is derived through EEA. The EEA input parameters include the "LENGTH" which is set to the real length of data needed to be ciphered and the other EEA input parameters remain the same,, so the length of generated key stream is the same as that of data needed to be ciphered. Then the plaintext data is encrypted by applying the key stream, which perform XOR operation between the data needed to be ciphered in initial layer 3 message and the key stream. The encrypted data is encapsulated in NAS PDUs. Based on above analysis, the partly secure protection of small data in NAS message for MO IP packets delivery can be done as followings: UE performs Attach activating a PDN connection or TAU (with an already active PDN a connection).Then UE sets the current "Security header type"
description: EPS Encryption Algorithm (EEA) is a protocol used for encrypting data in EPS (Evolved Packet System) networks. It generates a key stream to partly cipher initial layer 3 messages, ensuring secure transmission of small data in NAS messages for MO IP packets delivery.
explanation: The text refers to EEA as an algorithm used within the EPS network for encryption, indicating its function as a set of rules governing data transmission. This aligns with the definition of a protocol.
section_title: 5.7.4.1.2	Solution 1: Partly ciphering
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