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Open lock on the NOKIA phone

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  • #67634 Reply
    Peter
    Guest

    Hello, dear experts!

    I have one question not about network equipment but about mobile phones, moreover – the most popular one (at least in the nearest past) – NOKIAs.

    We get lots of complaints from our subscribers which use Nokia (different models) that during call establishment on the screen they saw open lock (near the picture of green handset). While the call the lock is not being showing but right after the end of call that lock shows itself again. And it is still open. All available sources (internet mostly) say that it means their operator disable ciphering.

    I work in operator company and i’ve checked myself that ciphering (A5/1) has already activated for all BSCs.

    And my question is:
    What does that lock mean?

    Many thanks again

    #67635 Reply
    VanG
    Guest

    Hi Peter,
    what is your network vendor and in which Nokia’s models this occurs?
    BR,

    #67636 Reply
    Peter
    Guest

    Hello, VanG!

    Network vendor is ALU (B10 now).
    Phones are: C1206, 5530, N7, 6230i.

    Actually, we never that lock closed (locked) :)))

    We check *Ciphering Hypotesis* in following way: connect 6230i to TEMS (and later – NEMO) and made some calls. While the call establishment we made some photos of that open lock and then from L3 messages show messages CIPHERING_MODE_CMD and CIPHERING_MODE_COMPLETE.

    So it’s not ciphering issue :))
    What is this?

    Thank for help in advance!!

    BR, Peter

    #67637 Reply
    pix
    Guest

    hi,

    in the message CIPHERING_MODE_COMPLETE

    what is the actual ciphering mode chosen ?

    even if the call is not ciphered, those “ciphering” messages are still exchanged. It is used to choose among A5/0, A5/1, A5/2 and A5/3. MS, BTS and MSC have to all agree on the same cipher.

    A5/0 = no cipher.

    Regards
    pix

    #67638 Reply
    Peter
    Guest

    Hello, Pix!

    Thanks!
    Excellent note – we saw those messages but didn’t check all them

    I’ve done it only now.

    It’s always A5_1 – the only ciphering algorythm possible in our network (BTS settings)

    Thank you very much!

    #67639 Reply
    pix
    Guest

    hi,

    it seems the nokia phone do know what its encryption status…
    blog.taddong.com/2011/02/does-your-phone-warn-you-when-it-is-not.html

    an open lock means there is no encryption.

    so either the phone is not behaving correctly
    … or your network is not behaving correctly
    … or you misread the Ciphering messages ?

    could you copy and paste the content of the ciphering complete message here please ?

    regards

    #67640 Reply
    DOMOX
    Guest

    HI, CAN ANY INE TELL ME HOW TO FIND OUT THE PARAMETER IN NOKIA SYSTEM REGARDING CIPHERING

    #67641 Reply
    Peter
    Guest

    Hello!

    Thanks a lot for very interesting material!

    The next portion of collected facts:

    1) in our country there are three operators: one use ericsson equipment, other – ericsson + huawei and we use ALU. In all networks Nokia 6230 behaves itself in the same way – shows open lock at the beginning of call

    2) here are messages from TEMS:

    MS1
    Ciphering Mode Command

    Time: 13:39:16.39
    Frame number: 670251

    Skip indicator : 0
    Protocol discriminator : (6) Radio resources management messages
    Message type : 53
    Cipher Response
    CR : (1) IMEISV shall be included
    Cipher Mode Setting
    Algorithm ID : Cipher with algorithm A5/1
    SC : (1) Start ciphering

    MS1
    Ciphering Mode Complete

    Time: 13:39:16.42
    Frame number: 670251

    Skip indicator : 0
    Protocol discriminator : (6) Radio resources management messages
    Message type : 50
    Mobile identity
    Odd/even indication : (0) Even number of digits
    Type of identity : (3) IMEISV
    Identity digits (BCD) : 3574450069750300

    As far as i understand it mean that ciphering had been established successfully.

    What do you think?

    Thank you very much for help!

    BR, Peter!

    #67642 Reply
    paraHO
    Guest

    Peter

    do you have the raw data (hex) for the entry below that you posted?

    2) here are messages from TEMS:

    MS1
    Ciphering Mode Command

    Time: 13:39:16.39
    Frame number: 670251

    Skip indicator : 0
    Protocol discriminator : (6) Radio resources management messages
    Message type : 53
    Cipher Response
    CR : (1) IMEISV shall be included
    Cipher Mode Setting
    Algorithm ID : Cipher with algorithm A5/1
    SC : (1) Start ciphering

    MS1
    Ciphering Mode Complete

    Time: 13:39:16.42
    Frame number: 670251

    Skip indicator : 0
    Protocol discriminator : (6) Radio resources management messages
    Message type : 50
    Mobile identity
    Odd/even indication : (0) Even number of digits
    Type of identity : (3) IMEISV
    Identity digits (BCD) : 3574450069750300

    #67643 Reply
    pix
    Guest

    peter,

    thanks for the detailed info 😉

    now it seems the MS is not behaving properly. The next step would be to contact Nokia and check with them.

    anyway, you can already re-assure your subscribers telling them that their connections are indeed secured with the best ciphering (or almost…) and that the “open lock” is not meaningful.

    thanks again for sharing your problem, it’s interesting !

    Pix

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