CA and certificate.

Hello world

Please, consider the following example:

R1------------------------CA---------------------------R2

We want R1 to get the CA certificate so R1 can use it to authenticate to R2. Similarly, R2 wants to get its own certificate, so it can authenticate to R1.

Both routers are configured to trust CA.

Before it can issue certificates to R1 and R2 which they can use to authenticate each other, it sends its own certificate which has its own public key (CA) and CA signature.  The video conference, I was looking at said that creates this signature, figure his own private key and attaches it to the certificate.

When R1 receives this certificate, R1 uses the public key of the CA to decrypt.

In order for R1 to prove that the certificate is it CA not an impostor, you should know what has been signed, before it was encrypted by GC using its private key and send to R1, when R1 receives and decrypts with the public key of the CA, it will be to compare and can therefore be sure that certificate came legitimate CA.

The question is how R1 knows the signature before the receipt of certificate from CA?

Thank you and have a nice day.

A certificate signature is created by applying an algorithm to hash on the contents of the certificate, and then encrypt the hash has resulted. so for R1 to know and verify the signature, it calculates the hash of the certificate received (by a mention in the cert hash algorithm), decrypt the signature, then compares the hash calculated both and decrypted signature that must be equal.

I hope this helps.

------

Kind regards.
Mercury Alshboul

Tags: Cisco Security

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