Criptografia e Segurança de Rede Unidade 1 - Parte 5: Modelos de Segurança de Rede

In this video, I have discussed about model of network security and model of network access security.

Explanation or Description
In considering the place of encryption, its useful to use the following two models. The first models information flowing over an insecure communications channel, in the presence of possible opponents. Hence an appropriate security transform (encryption algorithm) can be used, with suitable keys, possibly negotiated using the presence of a trusted third party.

The second model is concerned with controlled access to information or resources on a computer system, in the presence of possible opponents. Here appropriate controls are needed on the access and within the system, to provide suitable security. Some cryptographic techniques are useful here also.

Trusted system can also be seen as level base security system where protection is provided and handled according to different levels.

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