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Password security system designers noticed that users sometimes want to choose dictionary words because they are easy to remember. Hence, they decided to create pronounceable passwords that may be easy to remember because users can sound them out, but would not be words in the dictionary. Pronounceable passwords are made up of syllables and vowels connected together that are meant to be easy to remember. Some examples of pronounceable passwords generated by a package called Gpw (www.multicians.org/thvv/gpw.html) are ahrosios, chireckl, and harciefy.

The IFilteredModelBinder implements the IModelBinder interface and adds a method through which implementations can perform custom matching logic. In our case, we can look at the model type passed to the binder to determine if it inherits from our common base type, Entity. To use custom filtered model binders, we need to create an implementation that inherits from DefaultModelBinder, as shown in listing 14.2.

G_FILE_ERROR_NXIO G_FILE_ERROR_NODEV G_FILE_ERROR_ROFS G_FILE_ERROR_TXTBSY G_FILE_ERROR_FAULT G_FILE_ERROR_LOOP G_FILE_ERROR_NOSPC G_FILE_ERROR_NOMEM G_FILE_ERROR_MFILE G_FILE_ERROR_NFILE G_FILE_ERROR_BADF G_FILE_ERROR_INVAL G_FILE_ERROR_PIPE G_FILE_ERROR_AGAIN G_FILE_ERROR_INTR G_FILE_ERROR_IO G_FILE_ERROR_PERM G_FILE_ERROR_NOSYS G_FILE_ERROR_FAILED

public class SmartBinder : DefaultModelBinder { private readonly IFilteredModelBinder [] _filteredModelBinders; public SmartBinder ( params IFilteredModelBinder[] Accepts array of filteredModelBinders) IFilteredModelBinder { _filteredModelBinders = filteredModelBinders; } Overrides

You could give your users a limited number of login attempts before you disable or lock their account. The advantage of limited login attempts is that if an attacker is trying to break into a particular user s account, he will only be given a fixed number of tries (say, three or four). The downside of using this approach is that if a legitimate user happens to incorrectly enter her password just a few times, then her account will be locked. A legitimate user may then need to call a system administrator or customer service number to have her password reset. Another disadvantage of account locking is that it gives an attacker the ability to launch a DoS attack against one or more accounts. For instance, if the attacker gets a lot of usernames in the system and tries a couple of random guesses for each username s password, the attacker can end up locking a large fraction of the user accounts in a system.

The device on which the file is located cannot be found. The file type does not support mapping. The file system is read-only. The text file is currently busy. A pointer to a bad memory location was passed. Circular symbolic links have been detected. The disk is full; no space is available. No memory is available, and virtual memory is full. The current process already has too many open files. Too many files are open on the entire system. A reading file descriptor has been specified for writing or vice versa. The wrong argument has been passed. The pipe is broken or has been blocked. Resources are broken but may work if you try again later. The function call has been interrupted. A read or write error has occurred on the disk. The operation is not permitted. The function has not been implemented for your operating system. The operation failed for an unspecified reason.

public override object BindModel (

G_KEY_FILE_ERROR_UNKNOWN_ENCODING G_KEY_FILE_ERROR_PARSE G_KEY_FILE_ERROR_NOT_FOUND G_KEY_FILE_ERROR_KEY_NOT_FOUND

ControllerContext controllerContext, ModelBindingContext bindingContext) { foreach (var modelBinder in Checks if binder _filteredModelBinders) should execute { if (modelBinder.IsMatch(bindingContext.ModelType)) { return modelBinder.BindModel (controllerContext, bindingContext); Returns result } of binding }

You could introduce increasing artificial delays when users attempt to log into a system over the network. The first time that a user attempts to log in, you present the user with the username and password prompt immediately. If the user enters an incorrect password, you can have the system wait 2 seconds before allowing the user to try again. If the user still gets the username or password wrong, you can have it wait 4 seconds before allowing that user to try again. Generalizing, you can exponentially increase the amount of time before letting a particular client with a particular IP address try to log into your network.

An unknown encoding was attributed to the document being parsed. The document that was being parsed was not formatted correctly. The file provided to the function was not found. The key requested by the function was not found.

return base.BindModel (controllerContext, bindingContext); } }

The group requested by the function was not found. The value provided to the function could not be successfully parsed.