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When we use SSL(Secured Socket Level) Server has private key whereas client has public key.
In such cases client encrypt data and server decrypt it to get actual details, but how it will work if server is sending some critical financial details to client. In this situation as client has only public key so whether it is possible for key to decrypt details.
In short how secure communication from server–>Client works.
Public key cryptography is only used during the SSL/TLS handshake to agree on shared keys. The encryption/decryption of the data on top of SSL/TLS is then done using these shared keys.
You should read about Diffie-Hellman Key Exchange and RSA Key Exchange.
Here is a document describing the principles of the key exchange: http://technet.microsoft.com/en-us/library/cc962035.aspx
There is also a description of how this applies to SSL/TLS here: http://technet.microsoft.com/en-us/library/cc783349%28WS.10%29.aspx#w2k3tr_schan_how_eicp