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ETSI TS 155 216
M00004238
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ETSI TS 155 216 Digital cellular telecommunications system (Phase 2+); 3G Security; Specification of the A5/3 encryption algorithms for GSM and ECSD, and the GEA3 encryption algorithm for GPRS; Document 1: A5/3 and GEA3 specifications (3GPP TS 55.216 version 11.0.0 Release 11)
standard by European Telecommunications Standards Institute, 11/01/2012
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