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1 talked about controlling the variables associated with your passwords to ensure that your users must use the most secure passwords possible. It also talked about ensuring you use modern password-encryption techniques such as MD5 and shadow passwording. Although this greatly enhances the security of your password, it is not always a guarantee that your passwords are totally impenetrable. Further testing is a good idea to add further reassurance that your passwords are strong and secure. I will show you how to use the password cracker John the Ripper to test the strength of your passwords.

namespace 13.BobsMoviesMVC.Models { public class FilmRepository : BobsMoviesMVC.Models.IFilmRepository { private BobsMoviesMVC.Models.TheatreEntities dbContext = new BobsMoviesMVC.Models.TheatreEntities(); public IEnumerable<Film> GetAll() { return dbContext.Films; } public Film GetFilm(int ID) { return dbContext.Films.Single(f => f.FilmID == ID); } public bool Add(Film film) { if (film.GetErrors().Count == 0) {

s Caution Password cracking can be construed as a serious attack on a system. Do not run password cracking on a system that you do not control or do not explicitly have permission to run password cracking on.

The two most common forms of password cracking are brute-force and dictionary-based cracking Brute-force cracking requires throwing computing resources at a password you want to crack Usually a brute-force password-cracking program generates character sequences starting with one character and then incrementing from there and testing those character sequences against the password This often requires considerable time and resources, and if your passwords are secure, then an attacker is unlikely to break them unless they are prepared to very patient For example, a random password of eight characters in length and created from the 94 displayable ASCII characters would take a cracker approximately 1,930 years to crack using a typical desktop PC2 Of course, the more computing power you can throw at problem, the shorter you can make this time Thus, password cracking highly lends itself to using parallel processing and using multiple systems to work on cracking passwords simultaneously.

The second form of password cracking relies on inputting a dictionary of potential passwords, encrypting them using the algorithm used by your password encryption, and then testing them against the encrypted password This sort of cracking assumes users have chosen everyday words or combinations of everyday words as their passwords This is quite common unless you force your users not to use this style of password The system administrator s clich of easily hacked systems with passwords such as sex, god, and love is still alive and well out there Given the choice, your users will want to use a password they can easily remember, often containing personal information such as birthdays or pets names rather than a complex string of characters and symbols.

3 This is simply the most dangerous form of password, and I strongly urge you not to let your users use any word that is a dictionary word for a password Running a password cracker over your password files on a regular basis is a good way to ensure your users are not choosing weak or easy-to-guess passwords..

dbContext.Films.AddObject(film); Save(); return true; } else { return false; } } public bool Update(Film film) { if (film.GetErrors().Count == 0) { var ExistingFilm = dbContext.Films.Single(f => f.FilmID == film.FilmID); ExistingFilm.Title = film.Title; ExistingFilm.Description = film.Description; ExistingFilm.Length = film.Length; Save(); return true; } else { return false; } } public void Delete(int ID) { dbContext.Films.DeleteObject(dbContext.Films.Single(f => f.FilmID == ID)); Save(); } public void Save() { dbContext.SaveChanges(); } } }

When you reposition the shape, the text will move with the shape. However, when you rotate or flip the shape, the text will not rotate and/or flip. Once you size and position the shape, you can add a picture to the shape (see Figure 5-50).

I use a password cracker called John the Ripper (JTR). A few password crackers are available, including the now venerable Crack.4 I have chosen to cover JTR because it is regularly

2. 3. 4.

http://geodsoft.com/howto/password/cracking_passwords.htm#howlong http://zdnet.com.com/2100-11-530187.html legacy=zdnn http://www.crypticide.com/users/alecm/

Usually you will want to validate data before saving it back to the database (or you should). In this simple example, you will want to ensure that film entries have a title before inserting them into the database. One method of creating validation rules, as suggested in Wrox s Professional ASP.NET MVC, is using partial classes (an excellent ASP.NET MVC introduction). You will utilize a very similar method to that suggested in the book as it is easy to understand and very effective.