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3GPP (GSM only) 55-series – Security Algorithms

The technical specifications (TS) are displayed in blue, while the reports (TR) are shown in green.  TS that have been discontinued in earlier releases are indicated with a light blue color.  TR in the '9' range that have been stopped are highlighted in light green.  TS or TR with a yellow background indicate those updated at the latest  Q3-2025  Plenary Meetings, excepted if it is an automatic upgrade to Rel-19.  The new ones are displayed with a single red dotted overline.
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a vertical bar on the left means that the full text and graphic content are available online for this TS/TR
when it is darker, it means that all the figures have been redrawn, or that there are no figures
17 p.
 TS 55.205 REL  6 → 19 Specification of the GSM-MILENAGE Algorithms:
an Example Algorithm set for GSM Authentication and Key Generation Functions A3 and A8
Specification of the A5/3 Encryption Algorithms for GSM and ECSD, and the GEA3 Encryption Algorithm for GPRS
8 p.
 TS 55.216 REL  3 → 19 Document 1:  A5/3 and GEA3 Specification
8 p.
 TS 55.217 REL  3 → 19 Document 2:  Implementors' Test Data
8 p.
 TS 55.218 REL  3 → 19 Document 3:  Design and Conformance Test Data
9 p.
 TR 55.919 REL  3 → 19 Document 4:  Design and Evaluation Report
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8 p.
 TS 55.226 REL  9 → 19 Specification of the A5/4 Encryption Algorithms for GSM and ECSD,
and the GEA4 Encryption Algorithm for GPRS
14 p.
 TS 55.236 REL  6 → 19 Specification of A8_V MILENAGE Algorithm:
an Example Algorithm for the Key Generation function A8_V
 
Specification of the GIA4 Encryption Algorithms for GPRS
13 p.
 TS 55.241 REL  13 → 19 GIA4 Specification
10 p.
 TS 55.242 REL  13 → 19 Implementers' Test Data
10 p.
 TS 55.243 REL  13 → 19 Design Conformance Test Data
 
Specification of the GPRS Confidentiality and Integrity Algorithms GEA5 and GIA5
17 p.
 TS 55.251 REL  13 → 19 GEA5 and GIA5 Specifications
10 p.
 TS 55.252 REL  13 → 19 Implementers' Test Data
10 p.
 TS 55.253 REL  13 → 19 Design Conformance Test Data
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