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Understanding technical terms used in SSL is essential. Here you can learn more about:

• The additional licence purchase
• The certificate free reissue

Additional licence purchase

Depending on your needs or your technical pool,you may need to buy additionnal certificates or licences.

A certificate's always sold to be installed on a unique machine (physical or virtual).The additionnal licence makes then possible to duplicate an existing certificate instead of buying a new one for each different machine you may use.

• Physical machine:Electricaly connected machine
• Virtual machine:In process machine

Several configuration can be encountered :

• Active / Active
• Active / Inactive
• Back-up site
• Several virtual machines on one physical machine

How many licences or certificates do I need to buy ?

A digital certificate reissue:

A new certificate can be reissued in substitution of an existing one with the same fields but a different pair of keys*.
That can be done in those situations:

• A certificate loss after a hard disk failure
• A software switching
• The modification of the key sizes
• The vulnerability of the privet key
• The upgrating of the signature from MD5 to SHA1

*pair of keys : Item privet key / public key elements : if a new pair of keys is needed a new CSR has to be requested.

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