<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Jan,<div class=""><br class=""></div><div class="">Do you have traces of the attach/authentication? It seems like for some reason your MS don't like A5/3, because they are supposed to reply with Cipher Mode Complete. So top of my head I had the thought there might be something wrong with the initial establishment of the keys.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">Domi</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">2018. márc. 6. dátummal, 10:58 időpontban Bruckner Jan (ETAS-SEC/ECT-Mu) <<a href="mailto:Jan.Bruckner@escrypt.com" class="">Jan.Bruckner@escrypt.com</a>> írta:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Dear list,<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">I’m having trouble using the A5/3 encryption in my setup. A5/1 works perfectly fine [attachment a5_1.pcapng]. As soon as I switch to A5/3 and e.g. send an SMS, the last valid message I see in the Wireshark traces of the GSMTAP of osmo-bts-trx is the Ciphering Mode Command requesting A5/3. After that, several messages arrive at the bts, but it seems like it can’t make any sense of them. The MS repeatedly tries to send the SMS but never succeeds [attachment a5_3.pcapng]. Both MSs are connected to the same bts.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">According to the Classmarks of all MSs, A5/1 as well as A5/3 are supported.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">This is my Setup:<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -18pt;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><span class="">-<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">USRP N210<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -18pt;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><span class="">-<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">osmo-trx<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -18pt;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><span class="">-<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">osmo-bts-trx<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -18pt;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><span class="">-<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">osmo-nitb<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -18pt;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><span class="">-<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">osmo-pcu<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -18pt;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><span class="">-<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">osmo-sgsn<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -18pt;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><span class="">-<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">osmo-ggsn<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">I’m using a Debian 9 VM and tried both the packages from osmocom-latest as well as osmocom-nightly.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">The MSs I’ve tested are two Nexus 6 and one Samsung Galaxy S I9000. All three with sysmocom nano USIMs.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Could the decryption at the bts be incorrect? Has anyone tested/used it recently?<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">I’ll be happy to provide additional information if needed.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Thanks,<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Jan</span><o:p class=""></o:p></div></div><span id="cid:743DC826-583D-4C4F-8B8A-8043B361EDFA"><a5_3.pcapng></span><span id="cid:311E3CD4-F6F1-4731-A838-96AE8ADD6113"><a5_1.pcapng></span></div></blockquote></div><br class=""></div></body></html>