SA3LI07_034r1.doc - 3GPP TSG SA WG3-LI#25 Riga Latvia 25-27 Apr 2007 SA3LI07_034 Source Ericsson Nokia Siemens Networks Title Agenda item Proposed

SA3LI07_034r1.doc - 3GPP TSG SA WG3-LI#25 Riga Latvia 25-27...

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3GPP TSG SA WG3-LI#25 SA3LI07_034 Riga, Latvia, 25-27 Apr, 2007 Source: Ericsson, Nokia Siemens Networks Title: Proposed answers to SA3 on existing solutions for IMS media security and their impact on lawful interception requirements Agenda item: - Document for: Discussion and decision 1 Introduction TSG SA WG3 has sent to SA3-LI a LS in tdoc S3-070213 on existing solutions for IMS media security and their impact on lawful interception requirements, with two attachments in which different solutions are discussed from Security perspective. This contributions proposes possible replies to the questions from SA3 and is intended as base for discussion in SA3-LI, aiming to agree the reply LS to SA3. The following sections are based on the text provided by SA3 in tdocs S3-070122 and S3-070134, to which the proposed replies are added by using track changes 2 Questions from SA3 in S3-070122 and related answers 2.1 Examples of IMS Media Security Solutions and LI impact For all solutions discussed here we assume that the IMS media is secured on an end-to-end basis. We acknowledge that no decision has been taken yet about the feasibility of a pure end-to-end approach. Issues with such an approach may include transcoding, cf. S3-050501. We further assume that SRTP as specified in RFC3711 (although this has not yet been decided) is used for media protection, so the examples differ in the key management procedures. The choice of the examples does not express any preference for a particular solution or suggest that the solutions would be particularly well suited for IMS. They were merely chosen because the fundamental questions relating to LI can be well explained using these examples. Question 1 to LI group : We assume that there would be no requirement for operators to block any of the described or similar key establishment methods in their networks, or restrict the sale of handsets that could support these methods, because of lawful interception issues. The LI group is asked to comment on this assumption. Proposed answer to SA3: In the scenario gives above, f rom standard point of view there is no requirement for operators to block any key establishment method in the network. However national regulation may restrict the sale of handsets that could support specific encryption methods. Furthermore, no attempt has been made to assess the "cost" of providing lawful interception in each case, or to determine which approach provides the best balance between satisfying lawful interception requirements and protecting customers against unlawful interception. These aspects need to be studied further in other contributions. It is noted that the media stream may follow a different path from the SIP signalling, and the IMS provider may not even be involved in any way in transporting the media. An LI agency then may need to interact with both the IMS provider and the media transport provider in order to lawfully intercept IMS media.
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