The scope of the present document is documenting the review of DECT security procedures done during year 2017. The present document is structured as two different parts: ? A security overview and assessment@ addressed to the general public@ which presents a general description of the different DECT security elements and@ for each of them@ an assessment with specific recommendations to implementers@ including identification of possible threats (when applicable). This part of the study is covered by clause 4 of the present document. ? A detailed description of the improvements in security procedures introduced in the revisions of the DECT common interface (ETSI EN 300 175 series [i.1] to [i.8]) and the Generic Access Profile (ETSI EN 300 444 [i.9]) released in year 2017 (version 2.7.1 of ETSI EN 300 175 [i.1] to [i.8]) and version 2.5.1 of Generic Access Profile ETSI EN 300 444 [i.9]). This part of the study is covered by clause 5 of the present document and is mostly addressed to DECT manufacturers and TC DECT participants.