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ETSI TS 155 226
M00002241
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ETSI TS 155 226 Digital cellular telecommunications system (Phase 2+) (GSM); 3G Security; Specification of the A5/4 Encryption Algorithms for GSM and ECSD, and the GEA4 Encryption Algorithm for GPRS (3GPP TS 55.226 version 15.0.0 Release 15)
standard by European Telecommunications Standards Institute, 11/01/2018
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