Master of Science thesis Fighting Spam

this.transferExpirationTime = a.transferExpirationTime;
if (a.transactionList instanceof UnencryptedTransactionlist)
this.transactionList = new
UnencryptedTransactionlist((UnencryptedTransactionlist)a.transactionList);
else
this.transactionList = new
EncryptedTransactionlist(((EncryptedTransactionlist)a.transactionList));
}
public Coin(byte[] data) throws Exception
{
ByteArrayInputStream bis = new ByteArrayInputStream(data);
ObjectInputStream ois = new ObjectInputStream(bis);
}
this.type = ((Integer)ois.readObject()).intValue();
this.value = ((Double)ois.readObject()).doubleValue();
this.serialNumber = ((Long)ois.readObject()).longValue();
this.expirationTime = ((Long)ois.readObject()).longValue();
this.transferExpirationTime = ((Long)ois.readObject()).longValue();
this.maxNumberOfUsages = ((Integer)ois.readObject()).intValue();
Object input = ois.readObject();
if (input instanceof EncryptedTransactionlist)
this.transactionList = (EncryptedTransactionlist) input;
else
this.transactionList = (UnencryptedTransactionlist) input;
this.signature = (byte[])ois.readObject();
this.signHash = ((String)ois.readObject());
public byte[] getCompressed() throws IOException
{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(outStream);
out.writeObject(new Integer(type));
out.writeObject(new Double(value));
out.writeObject(new Long(serialNumber));
out.writeObject(new Long(expirationTime));
out.writeObject(new Long(transferExpirationTime));
out.writeObject(new Integer(this.maxNumberOfUsages));
out.writeObject(this.transactionList);
out.writeObject(this.signature);
out.writeObject(this.signHash);
}
byte[] result = outStream.toByteArray();
outStream.close();
out.close();
return result;
private void setCExpirationTime()
{
//Expirationtime is calculated
transferExpirationTime = System.currentTimeMillis();
transferExpirationTime += Config.CCoinExpirationTimeInMilliseconds +
Config.CCoinDelayTimeInMilliseconds;
//Debugger.debug(getClass(),1,"C_expirationtime set to:
"+C_expirationTime.getTime());
}
private void setBExpirationTime()
{
transferExpirationTime = System.currentTimeMillis();
transferExpirationTime += Config.CCoinExpirationTimeInMilliseconds;
}
public boolean transferTimeexpired()
{
return System.currentTimeMillis() > transferExpirationTime;
}
public void insertValues(double value, int maxUsages)
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