Hello,
> Can anyone help me to identify the certificate requirement for the
> below scenario
>
> We are planning to implement ssl for our b2b product
>
> Server : Apache webserver
> Client : JAVA based Product(not browser)
>
> 1. Server should authenticate the client.
> 2. Client should authenticate the server.
> 3. Server should encrypt and decrypt the message
> 4. Client should encrypt and decrypt the message
>
>
> Now for Point 2 to 3 (server side certificate) my understanding is
> a. I should generate private key, csr and then get it signed from
> authorities like verisign.
> b. Place the private key and the certificate at the server side
> c. Place the certificate (publickey+certificate) and root certificate
> at client side
> The server will decrypt and encrypt the messages using the its private
> key, the client will authenticate the server and encrypt and decrypt
> the message using server's public key + certificate.
>
> Now If have to implement point 1 (server authenticating the client) do
> I have to get another certificate for the client?
> If I have separate certificate for the client I have to have private
> key also for the client. In that case how the encryption, decryption
> does happen?
>
>
> In my client's(JAVA based Product) if I have to enable the ssl for
> point 1 I have to specify the client certificate and the private
> key(It expects the client certificate and private key. In that case
> both client and server will have its own private key. I am little
> confused how encryption and decryption will happen if both client and
> server has its own private key?
>
> Can any one help me to clarify the above.
In SSL, server RSA private_key/server_certificate is used to securely
transport from client to server 48 bytes of random data called
pre_master_secret from which key for symmetrical encryption alghoritms
(DES, AES) and message digest functions (MD5, SHA1) are created.
This means that encryption/decryption of real application data
is performed by symmetrical encryption, not RSA.
For short:
- server sends server_certificate to client
- client checks server_certificate (with root CA)
- client encrypts random 48 bytes with server_certificate and sends
to server
- server decrypts this data with server private_key and gets 48 random
bytes from client
- both sides calculates keys for encryption, MAC verification
Server proofs having proper private key by generating proper symmetrical
keys (identical with clients).
Client_private_key/client_certificate is used only for client
authentication. If server is configured to request client authentication
then special packet is send from server to client requesting
client certificate (certificate_request), in response client sends to
server his certificate (in certificate packet) and special packet
called certificate_verify which has special data encrypted with
client private key. Server verifies client certificate (with root CA),
decrypts data from certificate_verify packet using client certificate,
calculates your own data, compares this and if this equals - client
is authenticated by server. Of course this proof only that client
has client_private_key/client_certificate.
>From now, client key/certificate is not used.
Best regards,
--
Marek Marcola <[EMAIL PROTECTED]>
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