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Mohamed Asif. Carl Webster. Experts Exchange Take hold of your future. An unauthorized party intercepting data in transit, altering it, and retransmitting it is a data modification attack. Both of these hash algorithms create a checksum that changes if the data is altered in any way. This protection operates independently from the encryption process so you can enable data integrity with or without enabling encryption.
You can use the Diffie-Hellman key negotiation algorithm to secure data in a multiuser environment. Secure key distribution is difficult in a multiuser environment. Oracle Database uses the well known Diffie-Hellman key negotiation algorithm to perform secure key distribution for both encryption and data integrity. When encryption is used to protect the security of encrypted data, keys must be changed frequently to minimize the effects of a compromised key.
Accordingly, the Oracle Database key management function changes the session key with every session. You can use Authentication Key Fold-in to defeat a possible third-party attack historically called the man-in-the-middle attack on the Diffie-Hellman key negotiation algorithm key negotiation. It strengthens the session key significantly by combining a shared secret, known only to the client and the server, with the original session key negotiated by Diffie-Hellman.
The client and the server begin communicating using the session key generated by Diffie-Hellman. When the client authenticates to the server, they establish a shared secret that is only known to both parties. Oracle Database combines the shared secret and the Diffie-Hellman session key to generate a stronger session key designed to defeat a man-in-the-middle attack. The authentication key fold-in function is an imbedded feature of Oracle Database and requires no configuration by the system or network administrator.
In any network connection, both the client and server can support multiple encryption algorithms and integrity algorithms. When a connection is made, the server selects which algorithm to use, if any, from those algorithms specified in the sqlnet. The server searches for a match between the algorithms available on both the client and the server, and picks the first algorithm in its own list that also appears in the client list.
If one side of the connection does not specify an algorithm list, all the algorithms installed on that side are acceptable. The connection fails with error message ORA if either side specifies an algorithm that is not installed. Encryption and integrity parameters are defined by modifying a sqlnet.
You can choose to configure any or all of the available encryption algorithms, and either or both of the available integrity algorithms. Only one encryption algorithm and one integrity algorithm are used for each connect session. Oracle Database selects the first encryption algorithm and the first integrity algorithm enabled on the client and the server. Oracle recommends that you select algorithms and key lengths in the order in which you prefer negotiation, choosing the strongest key length first.
Table for a listing of valid encryption algorithms. Oracle Database Advanced Security Guide for a listing of available integrity algorithms. Data Encryption and Integrity Parameters. Parent topic: Configuration of Data Encryption and Integrity. The sqlnet.
Oracle Net Manager can be used to specify four possible values for the encryption and integrity configuration parameters. The following four values are listed in the order of increasing security, and they must be used in the profile file sqlnet.
This means that you can enable the desired encryption and integrity settings for a connection pair by configuring just one side of the connection, server-side or client-side. So, for example, if there are many Oracle clients connecting to an Oracle database, you can configure the required encryption and integrity settings for all these connections by making the appropriate sqlnet.
You do not need to implement configuration changes for each client separately. Table shows whether the security service is enabled, based on a combination of client and server configuration parameters. Otherwise, if the service is enabled, lack of a common service algorithm results in the service being disabled. This value defaults to OFF. Cryptography and data integrity are not enabled until the user changes this parameter by using Oracle Net Manager or by modifying the sqlnet.
Parent topic: About Negotiating Encryption and Integrity.
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