Master of Science thesis Fighting Spam

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} certRequestFile.delete(); Debugger.debug(getClass(), 1, err); throw new Exception(err); Thread.sleep(300); Debugger.debug(Cryptotools.class, 3, "Waiting for certificate to be generated"); checks++; } } } Debugger.debug(getClass(), 3, "Certificate generated"); Certificate cert = FileHandler.importCertificate(generatedCert); Debugger.debug(getClass(), 1, "Certificate imported successfully from file"); //generatedCert.delete(); certRequestFile.delete(); return; public void shutdown() throws Exception { } 10.4.7 VS 10.4.7.a VerificationServer package SpamCash.Servers.VS; import SpamCash.NetworkPackets.*; import SpamCash.Utilities.Config; import SpamCash.Utilities.Debugger; import java.io.FileInputStream; import java.security.cert.CertificateFactory; import java.security.cert.Certificate; import java.security.cert.CertificateException; import java.io.FileNotFoundException; import java.util.Random; import SpamCash.Utilities.Cryptotools; import java.security.interfaces.*; import java.io.*; import SpamCash.Utilities.FileHandler; import SpamCash.Servers.AbstractServer; import SpamCash.NetworkPackets.StatusPacket; import SpamCash.Currency.Coin; import SpamCash.Utilities.FileHandler; import SpamCash.Currency.TransactionlistElement; import SpamCash.Currency.UnencryptedTransactionlist; public class VerificationServer extends AbstractServer { private Certificate CESCertificate, RSCertificate; public VerificationServer() throws Exception { super(Config.BLSCertificateName, Config.BLSPrivateKeyName, Config.VSPort); CESCertificate = FileHandler.importCertificate(new File(Config.CESCertificateName)); RSCertificate = FileHandler.importCertificate(new File(Config.RSCertificateName)); 360
} public static void main(String[] args) { try { Debugger.setApplicationName("VerificationServer"); new VerificationServer(); } catch(FileNotFoundException ex) { Debugger.debug(VerificationServer.class, 1, "Initializationexception...file not found ", ex); } catch(Exception ex) { Debugger.debug(VerificationServer.class, 1, "Initializationexception...", ex); } } public synchronized StatusPacket VerificationRequest(VerificationPacket pack) { long time = System.currentTimeMillis(); Debugger.debug(getClass(), 1, "Verifying coin(s)..."); try { pack.coin.decryptTransactionlist(this.privateKey); //MaxUsages exceeded...? if(pack.coin.getMaxNumberOfUsages()
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IMM, DTU, Projekt nummer: 19 1. Apr
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Indholdsfortegnelse 1 Indledning...
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6.8.2 Blacklistserver..............
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10.1.4.e ErrorDialog...............
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Abstract Up until now spam email ha
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syvende og sidst er det dog op til
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Denne definition kan virke en smule
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3 Spambekæmpelse I dette afsnit vi
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fange de allerførste spammails af
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kaldes list-splitting [15] og benyt
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uger afgør, om en modtaget email k
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om retslige forhold i afsnit 3.6).
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Systemet minder om en simpel løsni
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De mest udbredte løsninger på spa
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paradoks, men et måske ikke så in
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(a) Original (a) Original (a) Origi
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4.3 Asymmetrisk kryptografi Et af d
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4.4 Blinde signaturer i RSA Blinde
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De resterende dele af denne rapport
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5.4 Betalingssystemer Når et nyt b
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Brugere af et offline system kan ik
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I systemet præsenteret af Tewari,
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At opdele informationen om brugerne
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- Proxyprogrammet skal tilbyde sikk
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En bruger af systemet vælger at in
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6 Design 6.1 Systemstruktur I analy
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(bl.a. i afsnit 6.3.2.a) beskrives
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6.3.1 Betaling I afsnit 5.2 blev de
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Serienummeret benyttes til detektio
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6.3.3 Økonomisk misbrug 6.3.3.a Mo
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Indløsning af stjålne mønter Nå
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Figur 12 C kopierer en mønt og ind
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kopi af mønten, eller en mønt hvo
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meget tæt på 0. I praksis er en b
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6.6.5 Use Case 4a: Afsend email Sce
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6.6.10 Use Case 8: Indløs penge Ud
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6.7.2 Netværkssikkerhed I det føl
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6.8 Kommunikationsprotokoller og se
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Ved at give klienterne mulighed for
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to måder. Pengeserveren opretter f
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synes det rimeligt at antage, at kl
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Mere konkret udfører pengeserveren
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Figur 22 - Oprettelsesproceduren, h
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telnet mail.ishoejby.dk 25 220-Welc
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med mailserveren og overtage dennes
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lov at slippe igennem. Skulle det s
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vigtigste objekter for at give et o
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Figur 26 getSafe()-funktionen. Denn
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Det uddybes nu præcis hvilke signa
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Modtagelse af email i IMAP (Use Cas
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Figur 32 Diagrammet viser, hvordan
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Kopiering af penge Det vil altid v
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mønter. Mere kritisk er det, hvis
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7 Implementation Med udgangspunkt i
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protokollen beskrevet i afsnit 4.4
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oprettelse. Først når brugeren tr
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Figur 34 Klassediagram for Proxy-pa
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Figur 35 Klassediagram for serverpa
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udskrevet i terminalen. Findes der
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ved at udføre trin 7 og trin 8). H
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8 Evaluering Formålet med at imple
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- Indkasser SpamCash . Brugeren mar
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I alle følgende Modtag email -case
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færdig. Derudover blev der sendt o
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- CurrencyBlindingFactorPacket(Blin
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RS Registreringsserver Registrering
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I pengeserveren skal det fastsætte
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Oprettelsesbeløb Oprettelse i syst
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ingen vil benytte systemet. At skul
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8.3.1.a Emailhåndtering SpamCash-s
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klienten brug for mindre, kunne den
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af systemet checker mail døgnet ru
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9 Konklusion Dette afsluttende kapi
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Som systemet er nu, udføres automa
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Appendiks A Installationsvejledning
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A.2 Installation og start af klient
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A.6.2 OpenSSL Oprettelse af certifi
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Appendiks B Brugsvejledning B.1 Spa
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For at starte registreringsprocedur
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Figur 43 Hovedvinduet under fanebla
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Figur 46 Fejlbesked ved åbning af
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Under møntantallene kan ses en lis
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Sker der en fejl eller er det ikke
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Figur 55 B.6.5 Opdater whitelist Di
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Appendiks C Litteratur I følgende
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[45] Levente Buttyán and Jean-Pier
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SpamCash 175
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GUI 177
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MailHandler 179
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Safe 181
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NetworkPackets 183
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CES 185
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Utilities 187
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Appendiks E Logfil Herunder ses et
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Appendiks F Maple kode Herunder ses
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Appendiks G Matlab kode I dette app
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Appendiks H JAVA Kode I dette bilag
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10.4.4 BLS ........................
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10 Kildekode 10.1 Client 10.1.1 Con
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throw new Exception("Error"); regis
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NotificationHeader header = new Not
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catch(ConnectException ex) { error
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throw new Exception( "An error has
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} Debugger.debug(getClass(), 1, "Co
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} MimeMessage ext2 = MimeTools.read
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addType1(c, privkey2, address4); ad
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public CurrencyExchangeClient() thr
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} return(int) (amount / Config.coin
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private PlusMinusListener plusMinus
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} } } setText(updateField(getText()
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} catch(Exception e) { return false
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"CheckBoxMenuItem.acceleratorSelect
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"InternalFrame.minimizeIcon", javax
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"PopupMenu.selectedWindowInputMapBi
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"TabbedPane.focusInputMap", javax.s
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"Tree.focusInputMap", javax.swing.p
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} } UIDefaults uiDefaults = UIManag
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} } } } 10.1.4.e ErrorDialog packag
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} } } labels[i].setHorizontalTextPo
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y = (buttonHeight - (int) bounds.ge
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"file.separator") "corner.gif")); s
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public void updateMailList() { if(s
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} else safeDialog.show(OpenSafeDial
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} } browsePanel.setLayout(new Borde
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} { } Dimension screenSize = Toolki
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} } { } System.out.println("Couldn'
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if(logonPanel.textFields[1].getText
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} } add(Box.createVerticalStrut(Def
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} } Dimension screenSize = Toolkit.
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} } } list.setListData(control.getW
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} public Signature getRecipientSign
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Updating Blacklist control.updateBl
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Debugger.debug(getClass(), 1,"Sende
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public OutgoingMailProcessor(Contro
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} InetAddress remoteAddress = clien
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} } } catch(IOException ex) { Debug
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if(status == 2) { connections.remov
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} if(parseArgument(command, 1).equa
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import SpamCash.Utilities.*; import
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Decode buffer decoder.decode(buffer
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} } } private String getName(Socket
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private void waitForAuthentication(
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} } index++; 287 index == numberOfM
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{ } if(argument.equals("")) { long
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} long numMessages = getNumberOfMes
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*/ private void handleUidl(String a
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} } return totalSize; /** * Gets th
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} buffers = 0; //command = partialM
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} Debugger.debug(getClass(),1,"FATA
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public void sentCoin(long serial,Ad
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public class SafeHandler implements
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} private Coin[] mergeCoinArrays(Co
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keyBytes = (byte[]) in.readObject()
Page 311 and 312: EarnedCoin ec = (EarnedCoin) usedCo
Page 313 and 314: 10.2.2 Coin package SpamCash.Curren
Page 315 and 316: { } this.value = value; this.maxNum
Page 317 and 318: this.transactionList = new Unencryp
Page 319 and 320: { } return; public boolean verify(C
Page 321 and 322: public TransactionlistElement(Trans
Page 323 and 324: } } try { this.list.addElement(new
Page 325 and 326: } } if(elem.getCertificate().equals
Page 327 and 328: } public String toString() { return
Page 329 and 330: RSABlindingFactor[][] rsabf = new R
Page 331 and 332: 10.3.11 LogonPacket package SpamCas
Page 333 and 334: } } for(int i=0;i
Page 335 and 336: 10.4 Servers 10.4.1 AbstractServer
Page 337 and 338: } key); key); key); } catch(IOExcep
Page 339 and 340: public boolean needUpdate() { long
Page 341 and 342: if(a.getSerialNumber() != b.getSeri
Page 343 and 344: { private BlackListServer BLS; priv
Page 345 and 346: System.out.println("withdrawFromUpF
Page 347 and 348: public CESCommunicationThread(Curre
Page 349 and 350: import SpamCash.Utilities.Debugger;
Page 351 and 352: } } else reportCoins(pack.coins[i],
Page 353 and 354: Exception { Debugger.debug(getClass
Page 355 and 356: f)) try { coin.insertValues(Config.
Page 357 and 358: public PendingAccounts pendingAccou
Page 359 and 360: } InputStream in = process.getError
Page 361: "Certificate for activationNumber:
Page 365 and 366: } } } 10.5 Utilities } Debugger.deb
Page 367 and 368: } // end try catch (java.io.Unsuppo
Page 369 and 370: destination[ destOffset ] = ALPHABE
Page 371 and 372: * @see Base64#DONT_BREAK_LINES * @s
Page 373 and 374: } // end encodeBytes /* ******** D
Page 375 and 376: } // end if: equals sign or better
Page 377 and 378: * @param filename Filename for savi
Page 379 and 380: int numBytes = 0; // Open a stream
Page 381 and 382: ); else { return -1; } // end else
Page 383 and 384: ** * Constructs a {@link Base64.Out
Page 385 and 386: { if( position > 0 ) { if( encode )
Page 387 and 388: public final static String blacklis
Page 389 and 390: System.out.println("Encrypted mail:
Page 391 and 392: } public static boolean verify(RSAP
Page 393 and 394: *----------------------------------
Page 395 and 396: } System.out.println(); private sta
Page 397 and 398: { java.security.cert.Certificate ce
Page 399 and 400: } } return null; public static void
Page 401 and 402: try { FileInputStream iFile = new F
Page 403 and 404: } File files[] = f.listFiles(); for
Page 405 and 406: } { } //Make the normal log-file lo
Page 407 and 408: { } FileInputStream is = new FileIn
Page 409 and 410: } } if(object instanceof Multipart)
Page 411 and 412: } //Debugger.debug(className,3,"Coi
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} found !"); newmp.addBodyPart((Mim
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{ } ByteArrayOutputStream bOut = ne
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} } public synchronized MimePacket
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} } } Debugger.debug(getClass(),3,"
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} SafeHandler safe = new SafeHandle
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} { blacklist = new Blacklist(); up
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Master of Science thesis Fighting Spam

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