Encrypting & Decrypting

[wichawd]

Hi. Lets say you have an encrypted password saved on a file. Inorder to decrypt the password you need the key used in the decrypting the password...right? How will I decrypt the password without exposing the key to the code or client?

 

[wichawd]

Correction........
Hi. Lets say you have an encrypted password saved on a file. Inorder to decrypt the password you need the key used in[decrypting] encrypting the password...right? How will I decrypt the password without exposing the key to the code or client?

 

[mutant]

You dont usually decrypt the password, but encrypt the string you want to compare to the encrypted one to see if they are the same. Framework has a handful of classes for encryption like MD5 or SHA.

 

[wichawd]

I see. So how do you protect the key you used to encrypt the anything in general?