Microsoft Word Master master doc

 
Security 
MIDP 1.0 can only offer non-secure Hypertext Transfer Protocol (HTTP) [31] and has 
weak support for confidentiality, integrity and authentication. In contrast MIDP 2.0 
supports the Secure Hypertext Transfer Protocol (HTTP over TLS, HTTP/TLS or 
HTTPS). Since HTTPS runs over the secure Transport Layer security (layer TLS), which 
again runs over TCP, support for encryption, integrity and authentication is taken care 
of. When using TLS a handshake is done between the client and the server. They first 
decide which algorithm to use, secondly they exchange certificate used to authenticate. 
This certificate is also used by the client to create and encrypt a session key. This session 
key is used to encrypt the rest of the session.
2.2.3
 
SIP API for J2ME 
The SIP API [8] for J2ME is designed as an Optional Package that can be used with 
different J2ME profiles. The API is designed to be a compact and generic SIP API which 
provides SIP functionality in transaction level. The API is integrated into the Generic 
Connection Framework which we described in2.2.1.1. The SIP API is used by 
applications to implement SIP User Agents (UA), such as User Agent Clients (UAC) and 
User Agent Server (UAS). SIP UA is explained in chapter 2.6.3. 

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2.3 Background information: : Unified Modeling Language 
Page 6 of 93 
2.3
 
Unified Modeling Language 
Unified Modeling Language (UML) [9] is a graphical notation for modeling. It is based 
on a four-layer metamodel structure, with the following layers: user object(s), model, 
metamodel and meta-metamodel. Each sub-layer is an instance of its parent metalayer. 
This means that an instance of a user object is an instance of its class type which is an 
instance of the UML metamodel Class which again is an instance of the meta-metamodel 
MetaClass. 
Several model and diagram types are defined, which are discussed in the sections below. 
The example figures are very basic, because an advanced description of these diagrams is 
out of scope for this thesis.[10] Have a small introduction to UML.