In this document are specified three ciphering algorithms: A5/4 for GSM, A5/4 for ECSD, and GEA4 for GPRS(including EGPRS). The algorithms are stream ciphers that are used to encrypt/decrypt blocks of data under aconfidentiality key KC. Each of these algorithms is based on the KASUMI algorithm that is specified in TS 35.202 [5].The three algorithms are all very similar. We first define a core keystream generator function KGCORE (clause 4); wethen specify each of the three algorithms in turn (clauses 5, 6 and 7) in terms of this core function.
Note that:
- GSM A5/4 is the same algorithms as GSM A5/3 but with KLEN changed from 64 to 128 bits.
- and ECSD A5/4 is the same algorithms as ECSD A5/3 but with KLEN changed from 64 to 128 bits.
- and GEA 4 is the same algorithms as GEA3 but with KLEN changed from 64 to 128 bits.
- Edition:
- 13.0.0
- Published:
- 01/01/2016
- Number of Pages:
- 8
- File Size:
- 1 file , 84 KB
- Note:
- This product is unavailable in Russia, Ukraine, Belarus
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