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Another alternative involves taking different parts of that key that may be used to encrypt a file and spreading it through various parts of the source code. This makes it harder for an attacker to piece the key together. Solutions that go in this direction, however, are based on obfuscation, and seek to create security by obscurity. Obscuring the location of the key in your program is not necessarily the best way to achieve security. While storing keys in source code is an option, it is not necessarily a good one. The difficulty of reverse-engineering a compiled binary is often significantly overestimated. There exist tools that can automatically analyze a binary executable file, unless specific measures are taken during compilation to confuse such tools. Such tools can often extract call graphs and cross-references between code and data from a binary, which often helps a reverse engineer to quickly zero-in on and analyze an interesting piece of code, such as encryption or key management routines. In addition, an attacker could run your program in a debugger, set breakpoints in strategic locations, and inspect the program s memory after the code that assembles the de-obfuscated key into memory has been run. It is best to assume that it is impossible to hide a secret within a binary from a reasonably skilled attacker.

Many to many: Zero or more instances of one entity are associated with zero or more instances of another entity Thinking about entities and mappings can be a bit abstract, so I ll show a wiki comments system as a concrete example Each wiki page can have lots of different comments, but the same comment won t appear on more than one page This means there is a one-to-many mapping between pages and comments The best way to represent a one-to-many mapping is by adding what is known as a foreign key to the comments table to store the id of the page to which the comment has been added An appropriate name for the column to hold the foreign key might be pageid This means that to find all the comments on, say, page 5, you would select all the comments in the comments table where pageid is 5.

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Note Unix systems are considered to have a single drive /, whereas a Windows machine's drive space

So far so good Now let s think about the tags that are a little more complicated Once again, pages can have multiple tags, but this time the same tag can also be used on multiple pages You have a many-to-many relationship This time the relationship can t be modeled by adding a foreign key to the tag table because although this would allow you to work out the tags used on a particular page, it wouldn t allow you to work out which pages used a particular tag unless you had duplicate tags in the tags table Creating duplicates of primary entities is often bad practice, so the only way to model the relationship between tags and pages is with a third table We ll call it pagetag.

Another option is to store keys in files on disk. Should an attacker gain full read access to the file system, she could search for files that have high entropy, and consider their contents to be candidate keys. (You can read Adi Shamir and Nicko van Someren s paper, Playing Hide and Seek with Stored Keys, for more information about such attacks.)

QFileInfo objects are used to hold information about files and directories. It has a number of useful methods, some of which are listed here:

The pagetag table will have three columns, a foreign key to the page table, a foreign key to the tag table, and a primary key of its own Here s an example of the data the tables might contain: page table +-----+------------------+-------------+---------------+ | id | content | posted | title | +-----+------------------+-------------+---------------+ | 1 | When I was.. | 2007-05-08 | The Other Day | | 2 | Databases are.. | 2007-07-13 | Databases | +-----+------------------+-------------+---------------+ tag table +-----+------------+-------------+ | id | name | created | +-----+------------+-------------+ | 1 | databases | 2007-07-13 | | 2 | life | 2007-03-10 | | 3 | fun | 2007-04-28 | | 4 | news | 2008-03-30 | +-----+------------+-------------+.

Other approaches include storing the key in the Windows registry instead of in a file. The Windows registry is a part of the operating system that maintains all kinds of configuration information for various programs that are executed on the computer. While it is not as easy for average users to open those files or the registry, it is simple for attackers. There is a utility called regedit, which an attacker, or even a slightly above-average user, can use to open the registry and potentially look at any keys that you might store there. Furthermore, registry entries are stored on disk by the operating system, and an attacker with full read access or administrator access can read registry entries. Windows does provide some support for preventing non-administrator accounts from accessing registry entries by locking them, but in general, the registry may not be the best place to store highly valuable secrets that your program uses.

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