Best way to put binary-data into string?

Hi there!
What I want to do is to transfer binary data via HTTP/GET so what I have to do is to transfer binary data into a string.
Currently I do this the follwing way:
 byte[] rawSecData = new byte[4]; //any binary datas
 ByteArrayOutputStream secBOS = new ByteArrayOutputStream(4);
 DataOutputStream secDOS = new DataOutputStream(secBOS);
 for(int i=0; i < rawSecData.length; i++)
 secDOS.writeByte(rawSecData);
secDOS.flush();
String secData = secBOS.toString();
System.err.println("Lenght of resulting String: "+secData.length());
I know that this way already worked fine, however I now set up my system up again with another linux-distro and now strange things happen.
e.g. the secData string differs in lenght from run-to-run between 2 and 4 and I don know at all why?
Transferring the binary-stuff into string-stuff (e.g. short-binary 255 255, String: 65536) is not possible for me because of various reasons.
The funny thing is that I remeber that this already worked some time ago and I can figure out why it now doesnt...
Please help!

First of all thanks a lot for your help!
Yes, I already think its an encoding problem, but how can I specify the encoding in my application in a portable way. I dont have an idea what to do.
My applikation should run as applet on many different 1.1+ VMS (msjvm, netscape-1.1.5, ...).
Thanks again, lg Clemens

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