barcode 128 crystal reports free DATA ENCRYPTION in Objective-C

Making ECC200 in Objective-C DATA ENCRYPTION

CHAPTER 16 DATA ENCRYPTION
ECC200 Creation In Objective-C
Using Barcode printer for iPhone Control to generate, create DataMatrix image in iPhone applications.
www.OnBarcode.com
Paint EAN-13 Supplement 5 In Objective-C
Using Barcode drawer for iPhone Control to generate, create EAN-13 image in iPhone applications.
www.OnBarcode.com
We can observe the effect of SALT easily. We ll continue using the table from the manual application encryption approach ops$tkyte%ORA11GR2> create table t 2 ( last_name varchar2(30), 3 encrypted_name varchar2(30) ENCRYPT 4 ); Table created. and populate the non-encrypted column, measuring the space used with our SHOW_SPACE routine (introduced in the Setting Up section in the beginning of this book) ops$tkyte%ORA11GR2> insert into t(last_name) 2 select object_name from stage; 64588 rows created. ops$tkyte%ORA11GR2> exec show_space( 'T' ) Unformatted Blocks ..................... FS1 Blocks (0-25) ..................... FS2 Blocks (25-50) ..................... FS3 Blocks (50-75) ..................... FS4 Blocks (75-100)..................... Full Blocks ..................... Total Blocks............................ Total Bytes............................. Total MBytes............................ Unused Blocks........................... Unused Bytes............................ Last Used Ext FileId.................... Last Used Ext BlockId................... Last Used Block......................... PL/SQL procedure successfully completed. 62 1 0 1 42 264 384 3,145,728 3 0 0 4 640 128
Encoding Barcode In Objective-C
Using Barcode printer for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Paint Barcode In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
So, that table has about 322 used blocks right now (384 total allocated blocks minus 62 unformatted, never used blocks). If we truncate that table and populate the ENCRYPTED_NAME column instead ops$tkyte%ORA11GR2> truncate table t; Table truncated. ops$tkyte%ORA11GR2> insert into t(encrypted_name) 2 select object_name from stage; 64588 rows created. ops$tkyte%ORA11GR2> exec show_space( 'T' ) Unformatted Blocks ..................... FS1 Blocks (0-25) ..................... FS2 Blocks (25-50) ..................... FS3 Blocks (50-75) ..................... FS4 Blocks (75-100)..................... Full Blocks ..................... Total Blocks............................ Total Bytes............................. Total MBytes............................ Unused Blocks........................... 62 3 0 0 31 652 768 6,291,456 6 0
Encode Code39 In Objective-C
Using Barcode maker for iPhone Control to generate, create Code 3 of 9 image in iPhone applications.
www.OnBarcode.com
Paint Code128 In Objective-C
Using Barcode creator for iPhone Control to generate, create ANSI/AIM Code 128 image in iPhone applications.
www.OnBarcode.com
CHAPTER 16 DATA ENCRYPTION
USS-128 Printer In Objective-C
Using Barcode creator for iPhone Control to generate, create EAN / UCC - 14 image in iPhone applications.
www.OnBarcode.com
UPC - 8 Generation In Objective-C
Using Barcode generation for iPhone Control to generate, create EAN8 image in iPhone applications.
www.OnBarcode.com
Unused Bytes............................ Last Used Ext FileId.................... Last Used Ext BlockId................... Last Used Block......................... PL/SQL procedure successfully completed.
DataMatrix Maker In None
Using Barcode creator for Font Control to generate, create DataMatrix image in Font applications.
www.OnBarcode.com
Printing DataMatrix In .NET
Using Barcode drawer for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
www.OnBarcode.com
0 4 1,152 128
Matrix 2D Barcode Creator In Visual Basic .NET
Using Barcode printer for .NET Control to generate, create 2D image in VS .NET applications.
www.OnBarcode.com
Code 128 Code Set B Drawer In None
Using Barcode generator for Font Control to generate, create Code 128 image in Font applications.
www.OnBarcode.com
you can see we jumped to having 706 used blocks (768 total blocks minus 62 never used blocks). That is, we doubled our storage. This does not mean that column encryption will double your storage needs not at all. It means that for this column, we ll need twice as much storage after encrypting than before. If this column represented 1 percent of the data in the table, it won t have a large impact on the total size of the table. However, if this column represented 50 percent of the data in the table, it would. It s something to think about when deciding whether to encrypt a column: what effect will it have on the size of the table overall We can remove the SALT from the column during encryption and see what impact that would have on storage. Recall however that by removing the SALT from the column, we reduce the protection afforded by encrypting it. If the attacker knows something of the data (i.e. the attack is an inside job because an employee has stolen the datafiles but doesn t have the keys to decrypt it), they may be able to figure out the values associated with some rows in a table because they have access to those rows in the real system. Then they could recognize where else those same values were anywhere in the stolen datafile since that value would encrypt to the same exact bytes wherever they were encountered in the file. If we redo the example without salting the column, we will observe ops$tkyte%ORA11GR2> truncate table t; Table truncated. ops$tkyte%ORA11GR2> alter table t modify encrypted_name encrypt NO SALT; Table altered. ops$tkyte%ORA11GR2> insert into t(encrypted_name) 2 select object_name from stage; 64588 rows created. ops$tkyte%ORA11GR2> exec show_space( 'T' ) Unformatted Blocks ..................... FS1 Blocks (0-25) ..................... FS2 Blocks (25-50) ..................... FS3 Blocks (50-75) ..................... FS4 Blocks (75-100)..................... Full Blocks ..................... Total Blocks............................ Total Bytes............................. Total MBytes............................ Unused Blocks........................... Unused Bytes............................ Last Used Ext FileId.................... Last Used Ext BlockId................... Last Used Block......................... PL/SQL procedure successfully completed. 62 0 1 0 50 509 640 5,242,880 5 0 0 4 1,024 128
EAN-13 Generator In Java
Using Barcode creator for Java Control to generate, create GTIN - 13 image in Java applications.
www.OnBarcode.com
Barcode Printer In Visual Studio .NET
Using Barcode encoder for .NET framework Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
PDF417 Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Barcode Scanner In Visual Studio .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Make USS-128 In None
Using Barcode encoder for Software Control to generate, create EAN / UCC - 13 image in Software applications.
www.OnBarcode.com
QR Code ISO/IEC18004 Printer In .NET
Using Barcode printer for Visual Studio .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Reader In .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
www.OnBarcode.com
Making UCC - 12 In None
Using Barcode encoder for Word Control to generate, create EAN / UCC - 13 image in Microsoft Word applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.