First, the original data has extra bits added i. The overall output is the original data being replaced with a string of alphanumeric values that represent the original data.
MD5 algorithm. Symmetric key algorithm also referred to as a secret key algorithm , transforms data to make it extremely difficult to view without possessing a secret key Turner, Symmetric key algorithms use trivially related, identical, cryptographic keys for both decryption and encryption. This means that there is one pre-shared key used with symmetric cryptography. Thus, the same key encrypts and decrypts, and are usually known by one or more authorized entities. According to Turner , symmetric key algorithms are used for: providing data confidentiality by using the same key for encrypting and decrypting data, and providing Message Authentication Codes MACs for source and integrity authentication services.
The key is used to create the MAC and then to validate it. S government and is one of the most popular symmetric algorithms used today.
To break it down, AES has bit block size, with key sizes of , and bits. Thus, AES uses a bit key length to encrypt and decrypt a block of messages, while AES uses a bit key length and AES a bit key length to encrypt and decrypt messages. Turner, D. Summary of cryptographic algorithms — according to NIST. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.
Database Configuration Assistant - Database Credentials In the next step you specify the storage type and storage locations for the database files. You can choose one of the following option for storage location - Use Database File Locations from Template - The file locations specfied in the template are used. Use Oracle Managed Files - With this option you only specify a default location and Oracle database will take care of the management of the database files by itself.
Selet one option and click Next. Database Configuration Assistant - Database File Locations In the Recovery Configuration screen you can specify a location to store and manage file related to backup and recovery such as redo logs, archive logs etc. Click Next. Memory Use this tab to specify memory management methods.
Typical - Using the slider you can select the percentage of physical memory that should be allocated. Custom - Lets you specify advanced memory configurations. Oracle Flash Recovery is new option in Oracle 10g. Oracle uses the Flash Recovery Area to store and mange the archive logs.
All file necessary to recover the database following a media failure are part of the Flash Recovery Area. Select which schema to install. And click next. Choose one of the following:.
Later, you can make modifications to database filenames and locations. All the database files will be created in this location. Use Oracle-Managed Files —Select this option to have Oracle directly manage operating system files comprising an Oracle database.
You specify default location called a database area for all your files. Oracle thereafter automatically creates and deletes files in this location as required. You can also create multiple copies of your redo and online log files by selecting Multiplex Redo Logs and Control Files. To learn more about redo logs and control files, refer to Chapter 9, "Performing Backup and Recovery". Selecting this option enables you to delegate the complete management of database files to the database.
You no longer need to specify the filenames, location, or their sizes. When you create a new database, it is important to configure the database so you can recover your data in the event of a system failure. You can select the following options:. Specify Flash Recovery Area —Select this option to specify a backup and recovery area and specify its directory location and size. You can use variables to identify standard locations. To review or add additional locations, click File Location Variables at the bottom of the window.
Enable Archiving —Select this option to enable archiving of database redo logs, which can be used to recover a database. You can accept the default archive mode settings or change them by selecting Edit Archive Mode Parameters. Oracle recommends you select Enable Archiving. Selecting this option provides better protection for your database in the case of software or hardware failure. If you do not select this option now, you can enable archive log mode later.
The Sample Schemas provide a common platform for examples. Oracle books and educational materials contain examples based upon the Sample Schemas. Oracle recommends they be included in your database. In the Custom Scripts tab, you can specify one or more SQL scripts to run after your database is created. Scripts are useful for performing post-installation tasks, such as loading custom schemas.
To specify scripts, check Run the following scripts; otherwise accept the default No scripts to run. Note that if you choose to run scripts after installation, your scripts must include a connect string that identifies the database. Click Help for more information. The links on this window provide access to windows that enable you change default initialization parameter settings.
These parameters fall into the following categories:. Use this window to set the initialization parameters that control how the database manages its memory usage. You can choose from one of the following approaches to memory management:. Typical —This method requires little configuration, and allocates memory as a percentage of total overall physical system memory. Select Typical and enter a percentage value. Custom —This method requires more configuration, but gives you more control over how the database uses system memory.
This option is meant for more experienced database administrators. You can directly specify memory sizes for the SGA and PGA and their sub-structures, such as the shared pool and buffer cache. Select Manual to enter specific values for each SGA component. In th is tab, you specify the smallest block size and the maximum number of operating system user processes that can simultaneously connect to the database.
In the Block Size list, enter the size in bytes or accept the default. Oracle Database data is stored in these blocks. One data block corresponds to a specific number of bytes of physical space on disk. While using pre-defined templates, this field is not enabled since the database will be created with the default block size of 8 KB. But while using the custom option, you can change block size.
Selecting a block size other than the default 8 KB value requires advanced knowledge and should only be done when absolutely required. In the Processes field, specify the maximum number of processes that can simultaneously connect to the database.
Enter a number or accept the default of The default value for this parameter is good enough for many environments.
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