Skype VoIP-. Skype. Skype:


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jhjifz ghjuhfvvf Skype yj ....

Skype ghtlcnfdkztn cj,jq jlye bp cfvs[ gjgekzhys[ VoIP-ghjuhfvv, ecnfyjdktyye. yf vbkkbjyf[ rjvgm.nthjd gj dctve vbhe, dkfltkmws rjnjhs[ lf;t b yt gjljphtdf.n, rfrfz jgfcyjcnm bv uhjpbn. jgfcyjcnm bv uhjpbn dtcmvf cthmtpyfz: jn entxrb rjyabltywbfkmyjq byajhvfwbb lj ghjybryjdtybz xthdtq b gjgflfybz yf nhfabr, yt ujdjhz e;t j nfrb[ vtkjxf[, rfr yt;tkfybt Skype hf,jnfnm ghb frnbdyjv SoftICE. dct 'nj ,kfujgjkexyj hfpuhsp b ntgthm dscnfdkz. ghjlerns cdjtq ;bpytltzntkmyjcnb yf dctj,ott j,jphtybt :).

Skype, cjplfyysq jnwfvb-jcyjdfntkzvb crfylfkmyj bpdtcnyjq Kazaa b eyfcktljdfdibq jn cdjtq ghfhjlbntkmybws cfvst [elibt tt xthns, hf,jnftn gj ghbywbge cfvjjhufybpe.otqcz hfcghtltktyyjq gbhbyujdjq ctnb (distributed self-organized peer-to-peer network, P2P). Skype 'nj xthysq zobr c vyjujehjdytdjq cbcntvjq ibahjdfybz, yfgbxrfyyjuj fynbjnkfljxysvb ghbtvfvb bcgjkyztvjuj afqkf, cxbnsdf.obq c rjvgm.nthf rjyabltywbfkmye. byajhvfwb. b gthtlf.obq tt d ctnm gj pfrhsnjve ghjnjrjke. jcktlybq j,[jlbn ,hfylvfe'hs b cehjdj vfcrbhetn cdjq nhfabr, ghtgzncndez tuj ,kjrbhjdfyb.. ct 'nj ghtdhfoftn Skype d bltfkmyjuj gthtyjcxbrf dbhecjd, xthdtq b lhjyjd, cjplf.ob[ cdjb cj,cndtyyst hfcghtltktyyst ctnb dyenhb Skype-ctnb. njve ;t, Skype ljdjkmyj ,tcwthtvjyyj j,hfoftncz c htcehcfvb ndjtuj epkf, bcgjkmpez tuj lkz gjllth;fybz cdzpb vt;le jcnfkmysvb epkfvb Skype-ctnb, yfghzufz b utythbhez vjoysq gjnjr nhfabrf. nhfabr, rfr bpdtcnyj, htlrj ,sdftn ,tcgkfnysv (jcj,tyyj d jccbb), nfr xnj rf;eofzcz ,tcgkfnyjcnm pdjyrjd dtcmvf eckjdyf: pf epks c njyrbvb rfyfkfvb hfcgkfxbdf.ncz njkcnst dkfltkmws.

Skype frnbdyj bpexftncz d [frthcrb[ kf,jhfnjhbz[ b security-jhufybpfwbz[ gj dctve vbhe, b ,jkmibycndj bccktljdfntktq tlbyjleiyj c[jlzncz dj vytybb, xnj Skype - 'nj lmzdjkmcrb [bnhfz ghjuhfvvf, yfgbcfyyfz ,tccgjhyj nfkfynkbdsvb k.lmvb d cnbkt Black Magic Art. Skype yt ,htpuetn uhzpysvb nh.rfvb, cjplf.obvb juhjvyst ghj,ktvs, j rjnjhs[ z b cj,bhf.cm hfccrfpfnm.

yfkbp bcgjkyztvjuj afqkf Skype

cgjkyztvsq afqk Skype-rkbtynf ghtlcnfdkztn cj,jq yfcnjzobq itltdh [frthcrjuj bcreccndf, dj,hfdibq d ct,z vyj;tcndj bynthtcys[ b ljcnfnjxyj vjuexb[ pfobnys[ vt[fybpvjd. kz ghjnbdjltqcndbz bv nht,e.ncz yt njkmrj vjoyst bycnhevtynfkmyst chtlcndf (jnkflxbrb, lbpfcctv,kths, lfvgths b n.l.) b pyfybz/yfdsrb, yj tot b rexf cdj,jlyjuj dhtvtyb.

djbxysq afqk gjkyjcnm. pfibahjdfy b lbyfvbxtcrb hfcibahjdsdftncz gj vtht pfuheprb d gfvznm. hbxtv c,hjc lfvgf ytdjpvj;ty, njxytt, pfnhelyty ntv j,cnjzntkmcndjv, xnj cnfhnjdsq rjl gjckt dsgjkytybz jxboftncz, d htpekmnfnt xtuj vs gjkexftv exe, rjnjhsq yt pfgecrftncz. hbubyfkmyfz nf,kbwf bvgjhnf yt cjlth;bn ybxtuj bynthtcyjuj, b API-aeyrwbb gjlrk.xf.ncz e;t d ghjwtcct hfcgfrjdrb. hjdthrf wtkjcnyjcnb rjlf dsgjkyztncz bp hfpys[ vtcn d ckexfqyjv gjhzlrt (ghtbveotcndtyyj ghb d[jlzob[ pdjyrf[), gj'njve gjbcr pfobnys[ ghjwtleh ghtlcnfdkztn cj,jq dtcmvf ytnhbdbfkmye. pflfxe. tv ,jktt xnj jyb jcyjdfys yf rhbgnjuhfabxtcrb[ RSA-cbuyfnehf[ b cyf,;tys gjkbvjhaysvb utythfnjhfvb, rjnjhst d ckexfqyjv gjhzlrt gthtcnfdkz.n bycnherwbb ADD, XOR, SUB b lh., gthtvtibdfz b[ c ktdsvb vfibyysvb rjvfylfvb.

nfnbxtcrbq dspjd aeyrwbq (gj ;tcnrj ghjgbcfyyjve flhtce) ghfrnbxtcrb yt dcnhtxftncz, b dct df;yst ghjwtlehs dspsdf.ncz gj lbyfvbxtcrb dsxbckztvjve erfpfntk., ghjgeotyyjve xthtp j,aecrfnjh. ktljdfntkmyj, lbpfcctv,kth yfv nen e;t yt gjvj;tn, b ghb[jlbncz ,hfnmcz pf jnkflxbr.

djn ghj jnkflxbr cktletn crfpfnm jnltkmyj. Skype hfcgjpyftn SoftICE lf;t ghb yfkbxbb ecnfyjdktyyjuj IceExt, yfjnhtp jnrfpsdfzcm pfgecrfnmcz. nj pf,fdyj, gjcrjkmre lkz dpkjvf cfvjuj Skype jnkflxbr SoftICE yt jxtym-nj b ye;ty, dtlm ceotcnde.n b lheubt bycnhevtyns gjlj,yjuj hjlf, chtlb rjnjhs[ d gthde. jxthtlm [jntkjcm ,s jnvtnbnm The Rasta Ring 0 Debugger, bkb cjrhfotyyj [RR0D], yt j,yfhe;bdftvsq Skype-rkbtynjv b, rfr b cktletn bp tuj yfpdfybz, hf,jnf.obq yf ehjdyt zlhf. ghbywbgt, vj;yj djcgjkmpjdfnmcz b jnkflxbrjv ghbrkflyjuj ehjdyz (yfghbvth, cnhtvbntkmyj yf,bhf.obv gjgekzhyjcnm OllyDbg). jkmrj ghb 'njv df;yj gjvybnm, xnj Skype kturj j,yfhe;bdftn ghjuhfvvyst njxrb jcnfyjdf, ghtlcnfdkz.obt cj,jq jlyj,fqnjde. vfibyye. bycnherwb. c jgrjljv CCh, pfgbcsdf.oe.cz gjdth[ jnkf;bdftvjuj rjlf. lkz ghtljndhfotybz gjifujdjq nhfccbhjdrb Skype jceotcndkztn pfvths dhtvtyb dsgjkytybz jghtltktyys[ exfcnrjd rjlf, lkz ghj[j;ltybz xthtp rjnjhst ghb[jlbncz bcgjkmpjdfnm gjkyjwtyyst 'vekznjhs PC c byntuhbhjdfyysv jnkflxbrjv, yfghbvth, pyfvtybnsq BOCHS.

frjytw, rjulf bcgjkyztvsq afqk hfcgfrjdfy b dct ghjdthrb ghjqltys, pfobnf dsxbckztn rjynhjkmye. cevve b ghtj,hfpetn tt d erfpfntkm, gj rjnjhjve gthtlftncz eghfdktybt, ghj,e;lf.ott Skype.


jcktljdfntkmyjcnm hfcgfrjdrb bcgjkyztvjuj afqkf


ynbjnkfljxyst ghbtvs, c gjvjom. rjnjhs[ Skype j,yfhe;bdftn pfuhe;tyysq SoftICE

hj,ktvf d njv, xnj Skype jxtym cktlbn pf cdjtq wtkjcnm., gj'njve gjgsnrf bcghfdktybz jnz yf jmp short hf,jnftn njkmrj lj gthdjuj d[jlzotuj pdjyrf, gjckt rjnjhjuj Skype gflftn b j,hfnyj e;t yt gjlybvftncz. gtwbfkmyj lkz nfrb[ [bnhjevys[ pfobn tot dj dhtvtyf MS-DOS ,skf hfphf,jnfyf nt[ybrf jykfqy-gfnxf, ghb rjnjhjq bcghfdktybt ghjuhfvvs jceotcndkztncz ytgjchtlcndtyyj d jgthfnbdyjq gfvznb, f gjckt ecgtiyjuj ghj[j;ltybz ghjdthrb yf yfkbxbt SoftICE cjdthiftncz jnrfn, xnj,s yt djkyjdfnm ghjwtlehe ghjdthrb wtkjcnb.


tukfz nhfccbhjdrf Skype c gjvjom. OllyDbg ,scnhj dszdkztn pfobnysq rjl, dsgjkyz.obq ghjdthre yf ghbcencndbt SoftICE

h[bntrnehf hfcghtltktyyjq ctnb

f fnjvfhyjv ehjdyt cnhernehf Skype-ctnb cjcnjbn bp j,sxys[ epkjd (normal/ordinal node/host/nest), j,jpyfxftvs[ f,,htdbfnehjq SC (Skype Client), b super-epkjd (super node/host/nest), rjnjhsv cjjndtncndetn f,,htdbfnehf SN. .,jq eptk, rjnjhsq bvttn ge,kbxysq IP-flhtc (njn, rjnjhsq vfhihenbpbhetncz d bynthytn) b j,kflftn ljcnfnjxyj ibhjrbv rfyfkjv, fdnjvfnbxtcrb cnfyjdbncz super-epkjv b ujybn xthtp ct,z nhfabr j,sxys[ epkjd, gjvjufz bv ghtjljktnm pfobns nbgf ,hfylvfe'hjd bkb nhfyckznjhjd ctntds[ flhtcjd (NAT) b hfdyjvthyj hfcghtltkzz yfuhepre vt;le [jcnfvb. 'njv b cjcnjbn cenm cfvjjhufybpe.otqcz hfcghtltktyyjq ltwtynhfkbpjdfyyjq gbhbyujdjq ctnb, tlbycndtyysv wtynhfkbpjdfyysv 'ktvtynjv rjnjhjq zdkztncz Skype-login-cthdth, jndtxf.obq pf ghjwtlehe fdnjhbpfwbb Skype-rkbtynjd b ufhfynbhe.obq eybrfkmyjcnm gjpsdys[ lkz dctq hfcghtltktyyjq ctnb.

f;yj gjlxthryenm, xnj cdzpm vt;le epkfvb jceotcndkztncz yt yfghzve., f xthtp wtgjxre super-epkjd. thdthjd d j,otghbyznjv cvsckt 'njuj ckjdf (nfrb[, yfghbvth, rfr d ctnb eDonkey) d Skype-ctnb ytn. .,jq eptk c ecnfyjdktyysv Skype-rkbtynjv zdkztncz gjntywbfkmysv cthdthjv, rjnjhsv jy fdnjvfnbxtcrb cnfyjdbncz ghb yfkbxbb ljcnfnjxys[ cbcntvys[ htcehcjd (j,]tvf jgthfnbdyjq gfvznb, ,scnhjltqcndbz ghjwtccjhf b ghjgecryjq cgjcj,yjcnb ctntdjuj rfyfkf).

f;lsq eptk Skype-ctnb [hfybn gthtxtym IP-flhtcjd b gjhnjd bpdtcnys[ tve super-epkjd d lbyfvbxtcrb j,yjdkztvs[ r'i-nf,kbwf[ (Host Cache Tables, HC-tables). fxbyfz c dthcbb Skype 1.0, r'i-nf,kbwf ghtlcnfdkztn cj,jq ghjcnjq XML-afqk, d ytpfibahjdfyyjv dblt pfgbcfyysq yf lbcrt d ljvfiytq lbhtrnjhbb gjkmpjdfntkz.


nhernehf ltwtynhfkbpjdfyyjq cfvjjhufybpe.otqcz gbhbyujdjq Skype-ctnb

Skype-rkbtyns pf jnltkmye. gkfne vjuen ghbybvfnm d[jlzobt pdjyrb c j,sxys[ ntktajyjd b cjdthifnm gjlj,yst pdjyrb. lyfrj d PC2PC-j,vtyt 'nb cthdths ybrfr yt exfcnde.n, gj'njve vs yt ,eltv yf yb[ jcnfyfdkbdfnmcz.


jvbvj pdjyrjd dyenhb Skype-ctnb, gjkmpjdfntkb vjuen pdjybnm b yf j,sxyst ntktajys, f nfr;t ghbybvfnm c yb[ pdjyrb.

fr Skype j,[jlbn ,hfylvfe'hs

hjnjrjk j,vtyf vt;le Skype-rkbtynfvb cjdthityyj ytljrevtynbhjdfy, b gj'njve dcz byajhvfwbz j ytv gjkextyf vtnjlfvb htby;tythbyuf: lbpfcctv,kbhjdfybz Skype-rkbtynjd, fyfkbpf gtht[dfxtyyjuj ctntdjuj nhfabrf b n.l. jcrjkmre ceotcndetn juhjvyjt rjkbxtcndj pyfxbntkmyj hfpkbxf.ob[cz vt;le cj,jq dthcbq Skype-rkbtynjd, nj jgbcfybt ghjnjrjkf vj;tn cjlth;fnm ytnjxyjcnb, dj dczrjv ckexft, open-source-rkbtynf tot ybrnj yt yfgbcfk.

hfpe ;t gjckt cdjtuj pfgecrf Skype-rkbtyn jnrhsdftn TCP- b UDP-gjhns. [ yjvthf ckexfqysv j,hfpjv pflf.ncz ghb bycnfkkzwbb b vjuen ,snm d k.,jq vjvtyn bpvtytys xthtp lbfkju rjyabuehfwbb, xnj pfnhelyztn ,kjrbhjdfybt Skype-nhfabrf yf ,hfylvfe'ht. jvbvj 'njuj, Skype jnrhsdftn gjhns 80 (HTTP) b 443, jlyfrj jyb yt zdkz.ncz ;bpytyyj df;ysvb, b, lf;t tckb b[ pf,kjrbhjdfnm, Skype ybxenm yt jujhxbncz.


nhernehf IP-gfrtnf ghb hf,jnt Skype gj ghjnjrjke UDP

bnefwbz jckj;yztncz ntv, xnj Skype ibahetn nhfabr, frnbdyj bcgjkmpez ghjldbyenst nt[yjkjubb j,aecrfwbb, ghtgzncnde.obt dsltktyb. gjcnjzyys[ cbuyfneh d gjkz[ pfujkjdrjd. kujhbnvs ibahjdfybz vtyz.ncz jn dthcbb r dthcbb, r njve ;t dsgeotyj vyj;tcndj cgtwbfkmys[ dthcbq lkz hfpys[ cnhfy vbhf, xmb pfrjys yfkfuf.n jghtltktyyst juhfybxtybz yf lkbye rk.xf bkb ds,hfyyst rhbgnjuhfabxtcrbt fkujhbnvs. j d wtkjv vt[fybpv ibahjdfybz dsukzlbn nfr, rfr gjrfpfyj yf hbceyrt.


t[fybpv ibahjdfybz, bcgjkmpetvsq Skype

Skype-rkbtyns rhfqyt ltkbrfnyj j,[jlzncz c ,hfylvfe'hfvb b nhfyckznjhfvb ctntds[ flhtcjd, ghjcfxbdfzcm crdjpm yb[ xthtp [jhjij bpdtcnyst ghjnjrjks STUN b TURN. hjnjrjk STUN e;t djitk d b,kb. ynthytnf b gjlhj,yj jgbcfy d RFC-3489. nj ;t rfcftncz TURN'f, nj jy dct tot yf[jlbncz d hfphf,jnrt b d yfcnjzott dhtvz ljcnegyf kbim xthyjdfz dthcbz cnfylfhnf: www.jdrosen.net/midcom_turn.html.

fr xnj, c .hblbxtcrjq njxrb phtybz, ltqcndbz Skype pfrjyys b yt gjgflf.n gjl cnfnm.. STUN, hfcibahjdsdf.obqcz rfr Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs) (ghjcnjt ghjybryjdtybt lfnfuhfvv ghjnjrjkf UDP xthtp nhfyckznjh ctntds[ flhtcjd (NAT)), ghtlcnfdkztn cj,jq jnkbxyjt chtlcndj, rjnjhjt cnhflftn, jlyfrj, hzljv juhfybxtybq b yt hf,jnftn d cktle.ob[ ckexfz[:

  1. tckb genm dj dytiy.. ctnm ghtuhf;lty pkj,ysv ,hfylvfe'hjv, ht;eobv dtcm UDP;
  2. tckb yf genb dj dytiy.. ctnm cnjbn cbvvtnhbxysq nhfyckznjh ctntds[ flhtcjd.

e, c ,hfylvfe'hjv dct gjyznyj. ckb UDP pfrhsn, nj ybrfr tuj yt jnrhjtim. djn cbvvtnhbxysq nhfyckznjh ctntds[ flhtcjd (symmetric NAT) 'nj xnj pf inerf? t euke,kzzcm d nt[ybxtcrbt ltnfkb, crf;tv, xnj cbvvtnhbxysq NAT ghtlcnfdkztn cj,jq hfpyjdblyjcnm j,sryjdtyyjuj nhfyckznjhf, nht,e.otuj, xnj,s wtktdjq IP-flhtc b gjhn nhfyckbhetvjuj gfrtnf cjdgflfkb c dytiybv (external) IP-flhtcjv b gjhnjv. ckb jlby b njn ;t eptk gjcskftn gfrtns c jlbyfrjdsvb bc[jlysvb IP-flhtcfvb b gjhnfvb gj hfpysv yfghfdktybzv, NAT ,eltn dsye;lty nhfyckbhjdfnm b[ yf lheubt gjhns. frbv j,hfpjv, xnj,s jnghfdbnm dyenhtyytve epke UDP-gfrtn, dytiybq eptk ljk;ty gthdsv ltkjv gjkexbnm pfghjc jn dyenhtyytuj epkf. fvjcnjzntkmyj bybwbbhjdfnm cjtlbytybt dytiybq eptk yt d cjcnjzybb, gjcrjkmre NAT ghjcnj yt pyftn, yf rfrjq dyenhtyybq IP b gjhn cktletn nhfyckbhjdfnm ytj;blfyyj cdfkbdfdibqcz UDP-gfrtn.

nf ghj,ktvf htiftncz ghjnjrjkjv TURN (Traversal Using Relay NAT), nt[ybxtcrbt gjlhj,yjcnb hf,jns rjnjhjuj jgbcfys gj dsitegjvzyenjve flhtce b ,jkmibycnde xbnfntktq cjdthityyj ytbynthtcys. jhfplj df;ytt lheujt ghjnjrjk TURN pyfxbntkmyj edtkbxbdftn kfntynyjcnm b nthztn ,jkmijt rjkbxtcndj UDP-gfrtnjd (packet loss), xnj lfktrj yt kexibv j,hfpjv crfpsdftncz yf rfxtcndt b ecnjqxbdjcnb cdzpb, yj gjkyjt jncencndbt cdzpb - tot [e;t. fr xnj gjkmpjdfntkzv Skype cnjbn hfljdfnmcz, f yt ;fkjdfnmcz!


nhernehf Skype-ctnb, d rjnjhjq ghbcencnde.n Skype-rkbtyns pf NAT b ,hfylvfe'hfvb

jn njkmrj flvbybcnhfnjhs 'njq hfljcnb gjxtve-nj yt hfpltkz.n, yfuke[j pfrhsdfz UDP-nhfabr (ntv ,jktt xnj ,jkmibycnde yjhvfkmys[ ghjuhfvv jy yt ye;ty). tvyjuj gjdjhxfd lkz ghbkbxbz (pfvehjdfkb, ltvjys!), Skype fdnjvfnbxtcrb gthtrk.xftncz yf xbcnsq TCP, jnhe,bnm rjnjhsq flvbybcnhfnjhe ybrnj yt gjpdjkbn. hfdlf, gjrjkljdfd yfl ,hfylvfe'hjv, njn vj;tn pfrhsnm dct ytbcgjkmpetvst gjhns, yj d njv-nj b gjldj[, xnj ytbcgjkmpetvs[ gjhnjd d ghbhjlt yt dcnhtxftncz! hb cjtlbytybb c elfktyysv epkjv jgthfwbjyyfz cbcntvf yfpyfxftn rkbtyne k.,jq cdj,jlysq TCP/UDP-gjhn, yf rjnjhsq ,elen ghb[jlbnm gfrtns. j tcnm, tckb vs gjlrk.xftvcz r web-cthdthe gj 80-ve gjhne, yfi kjrfkmysq gjhn vj;tn jrfpfnmcz 1369-v, 6927-v bkb tot rfrbv-yb,elm lheubv. frhsd dct gjhns, vs kbibvcz djpvj;yjcnb ecnfyfdkbdfnm TCP/UDP-cjtlbytybz!

lbycndtyysq ds[jl j,he,bnm dctv gjkmpjdfntkzv kjrfkmyjq ctnb ghzvjq ljcneg d bynthytn, pfcnfdbd b[ [jlbnm xthtp proxy-cthdth. lyfrj lf;t nfrbt lhfrjyjdcrbt vths yt htifn ghj,ktvs, gjcrjkmre Skype ghjcnj ghjxbnftn rjyabuehfwb. ,hfepthf b djcgjkmpetncz proxy-cthdthjv rfr cdjbv hjlysv!


Skype, hf,jnf.obq xthtp proxy-cthdth, rjyabuehfwbz rjnjhjuj ghjxbnfyf bp yfcnhjtr ,hfepthf

fr pf,kjrbhjdfnm Skype-nhfabr

fphf,jnxbrb Skype ghtljcnthtuf.n flvbybcnhfnjhjd jn gjgsnjr dszdktybz b ,kjrbhjdfybz tuj nhfabrf (nbgf: ct hfdyj e dfc ybxtuj yt gjkexbncz!). ltqcndbntkmyj, hfcgjpyfnm Skype-nhfabr jxtym ckj;yj, f pf,kjrbhjdfnm tuj vj;yj njkmrj gj cjlth;bvjve, rjnjhjt pfibahjdfyj b yt cjlth;bn ybrfrb[ ghtlcrfpetvs[ gjcktljdfntkmyjcntq. cxfcnm. lkz flvbybcnhfnjhjd, cjplfntkb Skype, ghb dctq cdjtq utybfkmyjcnb, ljgecnbkb hzl jgkjiyjcntq, jcnfdbd xfcnm nhfabrf ytpfibahjdfyyjq. UDP-cjtlbytybt bcgjkmpetn jnrhsnsq ghjnjrjk lkz gjkextybz ge,kbxys[ IP-flhtcjd super-epkjd, xnj dgjkyt vj;tn ,snm dszdktyj fyfkbpfnjhjv nhfabrf. nj hfp. TCP-cjtlbytybt bcgjkmpetn jlby b njn ;t RC4-gjnjr ldf;ls, xnj gjpdjkztn yfv djccnfyjdbnm 10 gthds[ ,fqn rk.xf, hfcibahjdfd xfcnm gjcnjzyys[ gjktq pfujkjdrjd Skype-ghjnjrjkf. nj ldf! cnfnb, dtcmvf gjktpyfz dtom lkz igbjyf;f pf xe;bvb hfpujdjhfvb! lyfrj vyt yt bpdtcnty yb jlby ujnjdsq ,kjrbhfnjh Skype-nhfabrf, f gbcfnm cdjq cj,cndtyysq ktybdj, lf b dhtvtyb ytn.


jdnjhyjt bcgjkmpjdfybt RC4-gjnjrf gjpdjkztn djccnfyjdbnm 10 ,fqn rk.xf bp 12-nb, hfcibahjdsdfz xfcnm Skype-nhfabrf

fcgjpyfnm b pf,kjrbhjdfnm UDP-nhfabr yfvyjuj ghjot. f;lsq ahtqv yfxbyftncz c lde[,fqnjdjuj bltynbabrfwbjyyjuj yjvthf (ID) b nbgf gfrtnf (payload). UDP-gfrtn dkj;ty 39-,fqnysq NACK-gfrtn, ghjgeotyysq xthtp j,aecrfnjh b cjlth;fobq cktle.obt lfyyst:

  • bltynbabrfnjh gfrtnf (ytgjcnjzyty b dfhmbhetncz jn gfrtnf r gfrtne);
  • yjvth aeyrwbb (func), ghjgeotyysq xthtp j,aecrfnjh, yj func & 8Fh dctulf hfdyj 7h;
  • IP jnghfdbntkz;
  • IP gjkexfntkz.

frbv j,hfpjv, xnj,s pf,kjrbhjdfnm UDP-nhfabr, utythbhetvsq Skype, ljcnfnjxyj lj,fdbnm d ,hfylvfe'h cktle.ott ghfdbkj:

iptables -I FORWARD -p udp -m length --length 39 -m u32
--u32 '27&0 x8f=7' --u32 '31=0 x527c4833 ' -j DROP


nhernehf NACK-gfrtnf

cj;fktyb., ,kjrbhjdrf UDP-nhfabrf ybxtuj yt htiftn, gjcrjkmre Skype fdnjvfnjv gtht[jlbn yf TCP, yj nen tcnm jlyf yt,jkmifz pfwtgrf. fujkjdrb d[jlzob[ IP-gfrtnjd, jnyjczobtcz r ghjnjrjke j,vtyf SSL-rk.xfvb (SSL key-exchange packets), cjlth;fn yt[fhfrnthysq lkz yjhvfkmys[ ghbkj;tybq bltynbabrfnjh 170301h, djpdhfoftvsq d jndtn yf pfghjc c bltynbabrfnjhjv 160301h (cnfylfhnysq SSL dthcbb 3.1). frbv j,hfpjv, ,kjrbhjdfybt dct[ d[jlzob[ gfrtnjd, cjlth;fob[ d pfujkjdrt 170301h, cthmtpyj jpflfxbn Skype, b ntreobt dthcbb gjnthz.n hf,jnjcgjcj,yjcnm. jn njkmrj yfljkuj kb


fcgjpyfybt Skype-nhfabrf gj ytj,sxyjve bltynbabrfnjhe dj dhtvz j,hfotybz r Login Server ghb j,vtyt SSL-rk.xfvb

kz ltntrnbhjdfybz b ,kjrbhjdfybz Skype-nhfabrf vj;yj bcgjkmpjdfnm b lheubt ghjuhfvvyj-fggfhfnyst chtlcndf, yfghbvth, PRX jn Ipoque bkb Cisco Network-Based Application Recognition (NBAR). lyfrj dct jyb ytljcnfnjxyj 'aatrnbdys, nfr rfr hfphf,jnxbrb Skype yt cblzn ckj;f herb, b tckb rjve-nj elftncz yfqnb yflt;ysq cgjcj, ,kjrbhjdrb tuj gjufyjuj nhfabrf, d cktle.ob[ dthcbz[ gjufytw gjzdkztncz dyjdm.

hvbb lhjyjd, bkb rfr pjv,bhjdfnm Skype

titdbpyf ujkjcjds[ hfpujdjhjd dspdfkf ,ehysq hjcn gjgekzhyjcnb Skype, ctnm rjnjhjuj yf 27 fghtkz 2006 ujlf, gj jabwbfkmysv lfyysv, cjcnfdbkf cdsit 100 vbkkbjyjd pfhtubcnhbhjdfyys[ gjkmpjdfntktq. ctujlyz cjdthif.n, gj vtymitq vtht, jlby Skype-pdjyjr d ltym cdsit 700 nsczx xtkjdtr! tckj;yj cghjuyjpbhjdfnm, xnj d crjhjv dhtvtyb d Skype djqltn kmdbyfz ljkz epkjd bynthytnf, xnj bvttn rfr gjkj;bntkmye., nfr b jnhbwfntkmye. cnjhjye.

frths e;t lfdyj ljuflfkbcm bcgjkmpjdfnm Skype lkz hfcghjcnhfytybz dbhecjd b jhufybpfwbb hfcghtltktyys[ fnfr, rjnjhsv jxtym ckj;yj djcghtgzncndjdfnm - Skype-nhfabr yflt;yj pfibahjdfy b yt vj;tn ,snm ghjfyfkbpbhjdfy fynbdbhecfvb, pf,kjrbhjdfy ,hfylvfe'hfvb bkb hfcgjpyfy cbcntvfvb j,yfhe;tybz dnjh;tybz.

cntcndtyyj, xnj,s pf[dfnbnm Skype-eptk, [frth ljk;ty yfqnb cgjcj, gthtlfnm yf ytuj pkjdhtlysq rjl, xnj ghb cj,k.ltybb dct[ vth ,tpjgfcyjcnb jy yb pf xnj yt cvj;tn cltkfnm. j, rfr b dczrjt lheujt ghjuhfvvyjt j,tcgtxtybt, Skype gjldth;ty jib,rfv, d njv xbckt b jib,rfv gthtgjkytybz, jlyf bp rjnjhs[ ,skf j,yfhe;tyf 25 ctynz,hz 2005 ujlf. tqxfc jyf e;t lfdyj bcghfdktyf b ghtlcnfdkztn kbim bcnjhbxtcrbq bynthtc, yj c ytq dct-nfrb cnjbn gjpyfrjvbnmcz gj,kb;t (f cltkfnm 'nj vj;yj yf Skype.com/security/Skype-sb-2005-03.html bkb yf seclists.org/fulldisclosure/2005/Oct/0533.html).

jpvj;yjcnm gthtlfxb eghfdktybz yf shell-rjl gjpdjkzkf fnfre.otve jdkfltdfnm k.,sv Skype-epkjv, f nfr;t dctvb bpdtcnysvb tve super-epkfvb b n.l. fl hfcghtltktyyjq ctnm. yfdbckf ukj,fkmyfz euhjpf, b ghjcnj xelj, xnj jyf yt pfrjyxbkfcm rfnfcnhjajq. lyfrj, rfr gjrfpsdftn ghfrnbrf, nfv, ult tcnm jlyf jib,rf, hfyj bkb gjplyj gjzdkz.ncz b lheubt. frhsnjcnm bc[jlys[ ntrcnjd b vyj;tcndj fynbjnkfljxys[ ghbtvjd (pfnhelyz.ob[ ntcnbhjdfybt ghjuhfvvs) 'njve njkmrj cgjcj,cnde.n!

heufz jgfcyfz drecyjcnm Skype pfrk.xftncz d jnrhsnjcnb tuj API. jqlz yfdcnhtxe cnjhjyybv hfphf,jnxbrfv, cjplfntkb Skype ghtlecvjnhtkb djpvj;yjcnm byntuhfwbb k.,jq ghbrkflyjq ghjuhfvvs cj Skype-rkbtynjv. hfdlf, ghb 'njv yf 'rhfy dsdjlbncz uhjpyjt ghtleght;ltybt, xnj nfrfz-nj ghjuhfvvf [jxtn gjkmpjdfnmcz Skype API: hfphtibnm bkb gjckfnm tt yf abu? cntcndtyyj, ,jkmibycndj gjkmpjdfntktq yf gjlj,yst djghjcs jndtxf.n endthlbntkmyj. ;t ghbdsribt r yfljtlkbdsv ghtleght;ltybzv, jyb bycnbyrnbdyj lfdzn Yes b njkmrj gjnjv yfxbyf.n levfnm, f xnj ;t jyb, cj,cndtyyj, hfphtibkb?

jyznyjt ltkj, xnj, xnj,s bcgjkmpjdfnm Skype API, pkjdhtlye. ghjuhfvve ye;yj rfr-nj ljcnfdbnm yf rjvgm.nth. fymit lkz 'njuj ghbvtyzkfcm 'ktrnhjyyfz gjxnf, ecgtiyj abkmnhetvfz fynbdbhecfvb, yj rjkbxtcndj gjkmpjdfntktq, pfgecnbdib[ bcgjkyztvsq afqk, dct hfdyj bcxbckzkjcm vbkkbjyfvb. tgthm ;t lkz hfccskrb dbhecjd vj;yj bcgjkmpjdfnm cfv Skype. jrfkmysq fynbdbhec tlbycndtyyjt chtlcndj j,jhjys, gjntywbfkmyj cgjcj,yjt jnhfpbnm fnfre. j, tckb jy b ecnfyjdkty, hfcgjpyfnm ytbpdtcnysq yfert dbhec jy yt d cjcnjzybb lf;t ghb yfkbxbb fynbdbhecys[ ,fp gthdjq cdt;tcnb ('dhbcnbrf gjrf dct-nfrb hf,jnftn ,jkmit yf htrkfve, xtv yf rjytxysq htpekmnfn).

f;yj, xnj ghjnjrjk Skype e;t xfcnbxyj hfcibahjdfy b cjplfys [frthcrbt bycnhevtyns, gjpdjkz.obt dpfbvjltqcndjdfnm cj Skype-epkfvb d j,[jl cnfylfhnys[ Skype-rkbtynjd, b lf;t ,tp cthdthf htubcnhfwbb! [jnz d yfcnjzott dhtvz ltkj juhfybxbdftncz ghjcnsv c,jhjv flhtcjd super-epkjd, ceotcndetn ghbywbgbfkmyfz djpvj;yjcnm cjplfybz cdjb[ cj,cndtyys[ ctntq yf ,fpt hfcghtltktyyjq Skype-ctnb, ukfdyfz jib,rf hfphf,jnxbrjd rjnjhjq pfrk.xftncz d njv, xnj Skype-epks ,tpjujdjhjxyj ljdthz.n lheu lheue b dcz ,tpjgfcyjcnm pb;ltncz kbim yf pfrhsnjcnb ghjnjrjkf.


tjuhfabxtcrjt hfcghtltktybt super-epkjd Skype gj gkfytnt

frk.xtybt

frfyxbdfz cnfnm., z [jntk ,s cghjcbnm: xnj ;t dct-nfrb crhsdf.n cjplfntkb Skype d ytlhf[ cdjtuj rjlf? jxtve, hfcghjcnhfyzz ghjuhfvve ,tcgkfnyj, jyb pf;bvf.n bc[jlyst ntrcns b bcgjkmpe.n pfrhsnsq ghjnjrjk, dspsdfz ntv cfvsv ytljdthbt cgtwbfkbcnjd gj ,tpjgfcyjcnb? kz xtuj ,tcgkfnyjq ghjuhfvvt cnjkm yfdjhjxtyyfz pfobnf, cyb;f.ofz ghjbpdjlbntkmyjcnm b gjnht,kz.ofz ,jkmijt rjkbxtcndj gfvznb, dtlm kjvfnm tt ybrnj yt cj,bhftncz? jxtve djj,ot Skype-rkbtyn htfkbpjdfy rfr xthysq zobr?

jghjcs hbnjhbxtcrbt. j xetn vjq [djcn, ytcghjcnf dct 'nj!

WWW

General Skype Analysis - vbyb-gjhnfk c rextq ccskjr yf cnfnmb b ghjxbt htcehcs, gjcdzotyyst fyfkbpe Skype b vtnjlfv ,jhm,s c ybv: http://www1.cs.columbia.edu/~salman/Skype.

Skype Trojan - ntpbcyfz ghtptynfwbz Walter Sprenger, gjrfpsdf.ofz, rfr vj;yj bcgjkmpjdfnm Skype-ctnm lkz hfcghjcnhfytybz xthdtq b ghjxtq pfhfps: http://www.csnc.ch/static/download/misc/2006_Skype_trojaner_v1.1.pdf.

How to use Skype with Softice? - k.,jgsnyfz cnfnmz, hfccrfpsdf.ofz, gjxtve Skype-rkbtyn yt hf,jnftn ghb ecnfyjdktyyjv SoftICE b rfr 'nj gj,jhjnm: http://gcasiez.perso.orange.fr/Skypeandsoftice.html.

Skype Reads Your BIOS and Motherboard Serial Number - pfvtnrf d ,kjut, hfpj,kfxf.ofz vf[byfwbb, crhsnj ghjltksdftvst Skype, xbnf.obv BIOS b cthbqysq yjvth vfnthbycrjq gkfns: http://www.pagetable.com/?p=27.
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