 it sends.
It is often desirable for a mobile node to be authenticated on connection to an IP network. One way for an IP network to recognise a mobile node is by using a shared secret key known by both the IP network and the mobile node. The shared secret is to be used as the cryptographic key. The shared secret can be first known by the IP network and then be stored in a mobile node if the management of the IP network gets a secure access to the mobile node. In the interest of security, the shared secret should not be sent over a network susceptible to eavesdropping. Therefore, the mobile node should be supplied to the management of the IP network. In the future, there are likely to be many different IP networks. According to the present arrangement, a mobile node would need to be provided with a database of secret keys in order to have one for each of the different IP networks with which it could be connected.
WO00/02406 discloses an authentication method intended for a telecommunications network, especially for an IP network. From a terminal in the network a first message containing an authenticator and a data unit is transmitted to the network, the data unit containing information relating to the manner in which the authenticator is formed. For carrying out authentication in the network, the data unit contained in the first message is used for determining a check value, which is compared with the said authenticator. To make it unnecessary for the terminal to perform any complicated and heavy exchange of messages when attaching to the network and for still obtaining the desired security characteristics for use, such an identification unit is used in the terminal which receives as input a challenge from which a response and a key can be determined essentially in the same manner as in the subscriber identity module of a known mobile communications system, a set of authentication blocks is generated into the network, of which each contains a challenge, a response, and a key, whereby the generation is performed in the same manner as in the said mobile communication system, at least some of the challenges contained by the authentication blocks are transmitted to the terminal:
one of the challenges is chosen for use at the terminal, and, based on it, a response and a key for use are determined with the aid of the terminal's identification unit, in the said first message the network is notified with the aid of the said data unit of which key corresponding to which challenge was chosen, and the authenticator of the first message and the said check value are determined with the aid of the chosen key.
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 It is often desirable for a mobile node to be authenticate on association to an IP network. One way for an IP net to recognise a fluid node is by using a share privy key know by both the IP network and the mobile lymph node. The shared secret is to be used as the cryptographic keystone. The shared secret can be first known by the IP network and then be store in a mobile node if the management of the IP network get a secure access to the mobile node. In the sake of security, the shared secret should not be sent over a network susceptible to eavesdropping. consequently, the mobile node should be supplied to the management of the IP network. In the future, there are likely to be many unlike information science network. According to the present arrangement, a mobile node would need to be provided with a database of confidential key in order to have one for each of the different IP networks with which it could be connect. 
 WO00/02406 discloses an authentication method intended for a telecommunication network, especially for an IP network. From a terminal in the net a first message containing an authenticator and a data unit is transmitted to the network, the data unit containing information relating to the manner in which the appraiser is formed. For behave out authentication in the network, the data unit contained in the first message is practice for determining a check value, which is compared with the said authenticator. To make it unnecessary for the terminal to perform any complicated and big exchange of message when attaching to the network and for however obtaining the desire security feature for use, such an recognition unit is used in the terminal which receives as input a challenge from which a reply and a key can be determined essentially in the same manner as in the subscriber identity module of a known mobile communications system, a stage set of authentication blocks is generated into the net, of which each contains a challenge, a response, and a key, whereby the generation is performed in the same manner as in the said fluid communication system, at least some of the challenges contained by the authentication blocks are transmitted to the terminal: 
 one of the challenges is chosen for habit at the end, and, free-base on it, a response and a key for use are determined with the care of the terminal's identification unit, in the said first message the network is notified with the aid of the said data unit of which cardinal corresponding to which challenge was chosen, and the authenticator of the first message and the said check value are determined with the aid of the choose key. 
 WO00
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It is often desiranle for a mobile node tm be ahthenticxted on connection to an IP ietwirk. Obe way for an IP netwofk to reclgnise a mobmle node is by using a smcred accret jey known by bpth the IP network and tve mlbile node. The shared secret is to fe used ad the cryptogrwphib hey. Fhe shared secret can be first knosn by tie IP network amd then be stored in a moblle jode if the managelent of the IP gwtwork gets x secure abeess to the mobile node. In the interest of secuxity, the shqrwd dgcret should not fe sent over a netwosk suscrptible to eavcsdro'pint. Therefore, the mobilx node should be supklied to tve management of thw UP nejwork. In gye wuthrx, tgere age mikely to ge many difderent IP networks. Scsirding to the presegt arrangement, a mobile node would need tm bs provided with a databqse of secret keys in order to have one for each of the different IP networks whth wiizh nb ziupd be connected.
WO00/02406 discloses an authentication jeuhoc intended for a telecomminlcsjions network, gspecially for an IP network. From a termunal in tre nrtwork a first message contqining an aunhenricator and a data unit is trcnsmitjed to the network, the data uuit cohtaining invormation felating to the oanker in which the authenticatow is formxd. Fox carryivg oot authqntication in tma network, the data unit cmntained ij the first message is used for determining a cvecn value, chich ls compared witr the said autkenticatjr. To make it uhnecessery for the eerminal to patform any com'licated wnd yeavt exchavee of messages when attcehing to rhe network and fov stium obtaining the dewired security vhafaceegisvics smr use, such dn iaengoficagion unit iw usec in the terminal whhch deceives as input s ghallenge from whych a responsr and a key can be detecmined essemtiwlly in the same manner as in fhe subscgibcr identity mjdulc of a known mpbile communications system, a set of auvhentication blocks is tenerated into the ueuwork, of whici each contains a challenge, a respobse, and a key, wheveby the generation is perfosmed ln the same manner as in the said mobile communication system, at least sone of vhq challengea comtainvd yy che autrentmcetion blocks are nransmitted to the terminal:
one oh the chalneuges is chosen for use at the tdrminal, and, bxsed on it, a response ans a key gor use are determined with the aid of the terminal's idcntificatuon uhit, in the said first messagr the uetworj is norificd with the aia og bhe said dwta nnic of which key corresponding to wyich cyaplenge was chosei, and the aubhtnticatkr of jhe first message and hhe sxid check valie are determimed with the aid of nhe chosen key.
WO00
it sends. It is often desirable for node be authenticated connection to an an network to recognise mobile node is using a shared secret key known both the IP network and the mobile node. The shared secret is to used as the cryptographic key. The shared secret can be first known by IP and be in a mobile node if the management of the IP network gets a secure access to mobile node. In the interest of security, the secret should not be over a network susceptible to Therefore, mobile node be to management of the network. In the future, there are likely to be many different IP networks. According to the present a mobile need to provided a of secret keys to have one for each of networks with which it could be connected. WO00/02406 an authentication intended for a telecommunications network, especially an IP network. From a terminal in the a first message containing an authenticator and a data unit is transmitted to the network, unit containing information relating the manner in the is For out authentication the network, the data unit contained in the first message is for determining a check value, which is compared with the To it unnecessary for terminal to perform any and exchange of messages when the and the security for use, such an unit is used in the which receives as input response and a key can be determined essentially the same manner as in the subscriber module of a known mobile communications system, a set of authentication blocks generated into of which each contains a challenge, a response, a key, whereby the is performed in the same manner as in the mobile system, at some of the contained by the blocks are transmitted terminal: one the is at the terminal, and, based on a and a key for use determined aid of the terminal's identification unit, in the said first message the network is notified aid of the said unit which key corresponding to which challenge was chosen, and the authenticator of message and the determined the aid the chosen key. WO00
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It is often desirable For a mobile Node tO be AutHeNticAted On connection to AN IP nEtwork. One way for an IP netWork tO rECognISe A mobiLe node iS By USIng A sHaRed SeCReT key kNowN by both The IP netwoRk aNd The mobile nodE. thE shared secRet Is to be used as The CryptoGrAphIC key. THe sHared Secret CAn be fiRst known bY tHE IP netWOrk and tHEN bE stoRed in a mobile node iF ThE Management of thE IP netWoRK gETS a sEcuRe access to ThE mobiLE node. In THe INTEreST of security, thE shared secrET shOuld noT bE seNT over a NetwoRk SUscEptible to eaVesdRopping. ThEreforE, The mobiLE node shOuld be SupPliEd to THe MaNagEmENt oF ThE IP NEtwOrk. In the FuTuRe, theRe arE LIKEly tO be Many DiffeRent IP networkS. AcCordINg tO the pResenT arrAnGemenT, a mobiLe nodE wOuld need to be proVideD with a datAbaSe Of sEcRet keYS in ordEr tO haVe one foR each of THe dIfFEREnT IP networks with whiCh IT CoUld be conNected.
wo00/02406 dIsCLoses an aUtHenTicaTIOn metHod iNTeNded for a TelecoMMuNiCations NeTwork, eSpEciAllY for aN iP neTwork. FRom a termInal iN The network a firST message contaINiNG An AUtheNtiCator and a daTa unIT is tRansMItTed TO the nEtworK, tHE dATa unit containing infOrMation RelatIng to the manneR in which thE AUThenticaTor iS FoRMed. For carrying Out auThenticatiON in the neTwork, The data uNit contaiNED in the fiRst MesSagE is USEd For determininG A ChecK vAlue, whiCh iS comparEd wIth The SaiD aUthenticaTor. To makE iT uNnEcEssAry foR The termiNaL to PeRfoRm any COmplicAted aNd heAvY eXChaNge of meSSaGES wheN aTtAchiNg tO tHe netWork ANd fOr still Obtaining The DEsirEd SeCurity cHaracteristicS fOr use, such aN iDenTificaTIOn unit is Used in the terminal which rECeives aS inPut a cHallEnge from wHicH a respOnsE And a keY can be DeterMiNed ESSentiALLy In tHe Same manner AS In tHe subScRibeR identiTy module of a known moBIle CommunicationS syStem, A SEt Of aUThENtiCaTIon BLOcks is generated Into the netWoRK, oF which each COntAiNs a chalLenge, a rEsponSE, and a keY, whereby tHe generatIoN is pERForMed in the saMe manner As in the saID mobiLE cOmmunIcaTion syStEm, aT leasT some oF The ChallEnges cOnTained By the AuThenticaTion blocks are transmitteD to the TermiNal:
One of the cHalLEngEs is choseN for Use at the teRmiNal, And, baSed ON it, a rEspoNSe And A Key foR use ARe determiNEd WitH THe Aid of the terMINAl's IdentIfiCAtion uNit, iN the said first messAGe the network is NotiFIEd wIth THe aiD oF the said data unIt oF wHICh key corReSponding to wHich chalLeNGe was Chosen, And the AuthentICAtOR of the FirsT meSsage and tHe sAiD Check vaLuE aRE deterMineD wIth the Aid of tHE choSEN key.
WO00
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It is often des irable for  a mo bil e n od e to  beauthenticatedo n co nnection to an IP netw ork.On e  way fo r anIP netw o rk t o r ec og nis ea  m obile  no de is b y using asha re d secret key kn own by bot h t he IP networ k a nd the  m obi l e nod e.The s hareds ecretis to beus e d as t h e crypt o g ra phic  key. The shareds ec r et can be firs t know nb yt h e I P n etwork and  t hen b e  stored in a mob i le node if th e managemen t  of  the I Pnet w ork ge ts ase c ure  access tothemobile no de. In the int e rest of  secur ity , t he s h ar ed  se cr e t s h ou ldn otbe sentov er  a ne twor k s u scep tib le t o eav esdropping. T her efor e , t he mo bilenode  s hould  be su pplie dto the manageme nt o f the IPnet wo rk.  I n the future , t her e are l ikely t o  be  m a n y  d ifferent IP networ ks . Ac cordingto the pr es e nt arran ge men t, a m obile  nod e  w ould nee d to b e  p ro vided w it h a da ta bas e o f sec r et k eys in  order t o hav e  one for eacho f the differe n tI P  n e twor kswith whichit c o uldbe c o nn ect e d.
WO 00/02 40 6  d i scloses an authenti ca tion m ethod  intended for  a telecom m u n ications  net w or k , especially f or an  IP networ k . From a  term inal inthe netwo r k  a first  me ssa gecon t a in ing an authen t i cato rand a d ata  unit i s t ran smi tte dto the ne twork, t he  d at auni t con t aining i nf orm at ion  rela t ing to  themann er  i n  wh ich the au t h enti ca to r is  fo rm ed. F or c a rry ing out  authenti cat i on i nth e netwo rk, the dataun it contain ed  in  the f i r st messa ge is used for determin i ng a ch eck  valu e, w hich is c omp ared w ith the sa id aut henti ca tor . To ma k e  i t u nn ecessary f o r  th e ter mi nalto perf orm any complicate d  an d heavy excha nge  ofm e ss age s  w h enat t ach i n g to the networ k and forst i ll  obtaining the  d esiredsecurit y cha r acteris tics foruse, such  a n id e n tif ication un it is us ed in the termi n al  whic h r eceive sasinput  a cha l len ge fr om whi ch  a res ponse  a nd a key  can be determined esse ntiall y inthe  same man ner asin the su bscr iber ident ity  mo duleofa  know n mo b il e c o mmuni cati o ns system ,  a  se t of  authentica t i o n b locks  is genera tedinto the network, of which eachcont a i nsa c h alle ng e, a response,  an da key, whe re by the gene ration i sp erfor med in  the s ame man n e ra s in t he s aid  mobile c omm un i cationsy st e m, atleas tsome o f thec hall e n ges contained by  thea u thent i cat ion b lo cks are tran smitted to  the termin al:
on e of  thechallen ge s is c hos en  for use a t  the term inal,  and, b as ed o n i t, a r espo n s e and  a k ey  fo r use are d et e rm in e d w iththe a id  ofthe termi n al's ide nti f ication  u nit , in the sa i d  first mes sag e the n etwork isn otif i ed withthe ai d of t he said dat aunit of  wh i c h key cor respondin g  to  w hich  challen ge  was  c hos en , and the authe nticator  of thef i rst me ssa g e an d  the s ai d check valu e are  d e termine d wit h the a i d o f t hechos enkey. WO00
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It is_often desirable for a_mobile node_to_be authenticated_on_connection to an_IP network. One_way for an IP_network to recognise_a_mobile node is by using a shared secret key known by both the IP_network_and the_mobile_node._The shared secret is to_be used as the cryptographic_key. The_shared secret can be first known by the_IP_network and then_be stored in a mobile node if the management_of the IP network gets a_secure access to_the_mobile_node. In the interest_of security, the shared secret should_not be sent over a network_susceptible to eavesdropping. Therefore, the mobile node_should be supplied to the management_of the IP network. In_the future,_there are likely to be_many different IP_networks. According_to the present_arrangement, a mobile node would need_to be provided_with a database of secret keys_in_order to have_one_for_each of_the different IP_networks_with which_it_could be connected.
WO00/02406 discloses an authentication_method_intended for a telecommunications network, especially for_an IP network. From_a_terminal in the network_a first message containing an_authenticator and a data unit is_transmitted to_the network,_the data unit containing information relating to the manner in which_the authenticator is formed. For carrying_out authentication in the_network, the_data_unit contained in_the_first message_is used for determining a check value,_which is_compared with the said authenticator. To_make it unnecessary for_the_terminal to perform any complicated and_heavy exchange of messages when attaching_to the network and for_still_obtaining_the desired security characteristics for_use, such an identification unit is_used in the_terminal which receives as input a challenge_from_which a response and a key_can_be determined essentially in the same_manner_as_in the subscriber identity module_of a known mobile communications system,_a set of authentication blocks is generated into the_network, of which_each contains a challenge, a_response,_and_a key, whereby the generation is performed in the same_manner as_in the said_mobile communication system, at least some of the challenges contained_by the authentication blocks are transmitted to_the terminal:
one of the challenges is chosen for use at the_terminal, and, based on it, a response and_a key for use are determined with_the aid of the_terminal's_identification unit, in the said first message_the_network_is_notified with the_aid of the_said data unit_of which_key corresponding to_which challenge_was chosen, and_the_authenticator of the first message and the said check value are determined with the aid of the chosen_key.
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