Master of Science thesis Fighting Spam

this.transactionList = new UnencryptedTransactionlist
(((EncryptedTransactionlist)this.transactionList),key);
return;
}
throw new Exception("Cannot decrypt. The list is not encrypted.");
}
public void encryptTransactionlist(RSAPublicKey key) throws Exception
{
if (this.transactionList instanceof UnencryptedTransactionlist)
{
this.transactionList = new EncryptedTransactionlist
((UnencryptedTransactionlist)this.transactionList, key);
return;
}
throw new Exception("Transactionlist is already encrypted.");
}
public String printSizes() throws Exception
{
String s="";
int numbers = (4+8+8+4);
int extime = 8;
int sign = signature.length+signHash.length();
int cextime = 8;
s += " Numbers: "+numbers+" bytes\n";
s += " ExpirationTime: "+extime+" bytes\n";
s += " Signature: "+sign+" bytes\n";
s += " Coin expirationTime: "+cextime+" bytes\n";
s += " Transactionlist: "+transactionList.printSize();
s += " TransactionList total "+transactionList.getSize()+" bytes\n";
s += " Total:
"+(numbers+extime+sign+cextime+transactionList.getSize())+" bytes\n";
}
return s;
public int size() throws Exception
{
int numbers = (4+8+8+4);
int extime = 8;
int sign = signature.length + signHash.length();
int cextime = 8;
int tlist = transactionList.getSize();
}
return (numbers + extime + sign + cextime + tlist);
public String toString()
{
return "Coin:\n\t value = " + value + "\n\t SerialNumber:" + serialNumber + "\n\t
ExpirationTime = "+ new Date(expirationTime) + "\n\t transferExpirationTime = "+ new
Date(transferExpirationTime) + "\n\t maxUsages = " + maxNumberOfUsages + "\n" +new
Signature(signHash,signature)+"\n" + transactionList;
}
public static void main(String[] sa)
{
long expTime = System.currentTimeMillis();
System.out.println("Current time: long="+expTime+" Date="+new Date(expTime));
expTime += Config.expirationTimeInMilliseconds;
System.out.println("+30days time: long="+expTime+" Date="+new Date(expTime));
System.out.println("0-time : long="+0+" Date="+new Date(0));
System.out.println("Config time : long="+Config.expirationTimeInMilliseconds+"
Date="+new Date(Config.expirationTimeInMilliseconds));
System.out.println("number time : long="+(100*24*60*60*1000)+" Date="+new
Date(100*(24*60*60*1000)));
Coin a = new Coin(5.0, 1241324, expTime , 10, null, null);
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