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fluent-nhibernatenhibernate-mappingmd5

How to decrypt MD5 Password in NHibernate mapping?

Is there a way to do this? In my mapping class, I want to decrypt a MD5 password when I fetch my database data into entities. Is this possible?

Thank you!

Solution

  • MD5 can be used to encrypt passwords. MD5 is considered as a broken. What you do is you hash the password with MD5 and compare it with the original hash value in the database. Since MD5 is one way, if the passwords are same, hash value is same.

    Edit:

    If you are looking for cracking MD5 encrypted passwords, That is something different. Take a look at this

    You mist first understand that this is not technology specific. These are basic computer science generic concepts which can be used implemented using various technologies. In you case C# and NHibernate etc.

    To be simple, what you are doing with MD5(Message-Digest algorithm 5) is, you do hashing. because it is a hashing function. take a look at this.

    But this MD5 is a one way hash function. "one way" means that it's nearly impossible to derive the original text from the string. That is why it is used for password encryption. Because you can not reverse a one way function and get the actual password. Take a look at this as well.

    I assume that you want to check weather the inserted password is correct and allow log-in or do what ever necessary. You should not be doing decryption a password. If you are not going to crack a password. Password cracking is more of a guessing and scope can be reduced using the weaknesses of implemented methodologies(In MD5 hashing collisions).

    In password creation, you take the password and you hash it using MD5(in your case).Then this hash value is what you are going to store in a database. Then next time you want to check weather the password is correct. Then you again take the password and you again hash it using MD5. then you take that hash value and compare it with the hash value in the database. If they match inserted password is correct.

    I can see that you are new to SO. What I recommend is that you better learn these concepts first and the these concepts will help you irrespective of what technology you use.