Transport Layer Security

Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide communication security over the Internet. TLS and SSL encryptthe segments of network connections at the Application Layer for the Transport Layer, using asymmetric cryptography for key exchange, symmetric encryption for confidentiality, and message authentication codes for message integrity. Several versions of the protocols are in widespread use in applications such as web browsing, electronic mail, Internet faxing, instant messaging and voice-over-IP (VoIP). TLS is an IETF standards track protocol, … Continue reading →

Troubleshooting networking using the OSI model

When troubleshooting networking it is always sensible to approach the problem from the perspective of the OSI model. The OSI, or Open System Interconnection, model defines a networking framework for implementing protocols in seven layers. The beauty of this model is the fact that you can individually troubleshoot every layer using simple methods. I suggest … Continue reading →

Network Troubleshooting via the OSI Model

We all hate the dreaded “This page cannot be displayed” or similar network / internet connection errors but how do we determine if the problem is network, cabling or just browser related? And what can we do to rectify the situation? Using the Open Systems Interconnect model (OSI) we can troubleshoot our internet connectivity from … Continue reading →