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Welcome to the lecture devoted to cryptology this time we exam the operating principle of the public

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key infrastructure.

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This is the best mechanism that computerise society has managed to develop.

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It allows us to implement the principle of trust but control

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in this module will discuss the purpose and content of certificates which are compatible with the x

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5 or 9 standard.

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We will consider what role certificates play.

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In other words why they should be issued.

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We'll talk about why certification authorities help build a relationship of trust will say a few words

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about two models for building relationships of trust.

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Will show in particular why certificates shouldn't be trusted too quickly especially certificates of

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other certification authorities.

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We'll consider how to plan your own certification authority structure will express what benefits we'll

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have from issuing certificates ourselves to users of our computer system.

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Instead of buying individual certificates

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we'll say a few words about the configuration and installation techniques of the root certification

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authority in the Microsoft Windows environment will consider among other things why this authority should

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be an offline authority and what this means

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will learn how to install an additional subordinate's certification authority and what obligations are

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related to the management of certification authorities and the certificates issued by these authorities.

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We'll tell you why this separation is important in the end will devote a few minutes to subjects connected

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with archiving private user keys.

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We'll tell you when this makes sense and what risk to the security of the system or connected with it.

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Well summarize by stating the practical applications of using public key infrastructures.

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Let's get started.