name: ECIES
full_form: Elliptic Curve Integrated Encryption Scheme
context: Current usage of ECIES for concealment of SUPI can be expanded to accommodate SQNMS and SUPI. Maximum allowed size of cipher text from concealment of protection scheme output is 3000 digits. SUPI utilizes only few bytes of those maximum allowed digits and still can adapt SQNMS. Figure 6.4.3.2-1 Encryption based on ECIES at UE Figure 6.4.3.2-1 shows the encryption based on ECIES at UE side, where SUPI is concatenated with SQNMS and taken as one plain text block for symmetric encryption. In case of SUPI type as IMSI, then MSIN (9 to 10 digits) and SQNMS (48 bits: 6 bytes) is concatenated in UE. Figure 6.4.3.2-2: Decryption based on ECIES at home network Figure 6.4.3.2-2 shows the decryption based on ECIES at home network, where SUPI and SQNMS is dissociated after the symmetric decryption. Figure 6.4.3.2-3: Structure of SUCI Figure 6.4.3.2-3 shows the structure of SUCI with SUPI Type, which consists values in the range 0 to 7 as specified in clause 2.2B of TS 23.003 [8]. SUPI Type
description: Elliptic Curve Integrated Encryption Scheme (ECIES) is a cryptographic protocol used for secure data encryption and decryption. It is specifically utilized in the context of concealing SUPI (Subscriber Permanent Identifier) and SQNMS (Sequence Number for Message Security). ECIES is employed at both the UE (User Equipment) side for encryption and at the home network for decryption.
explanation: The text describes ECIES as a scheme used to encrypt and decrypt data, particularly focusing on its role in protecting sensitive information like SUPI and SQNMS. This definition aligns with the characteristics of a protocol, which establishes rules and procedures for secure communication.
section_title: 6.4.3.2	Solution details
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