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Java Forum / Security / January 2005MD5 or DES encryption
I have a 3rd party app that is going to encrypt a username/password and send it to me over the URL string. I've found examples of how to decrypt it but that means I have to have the key file that was used to encrypt it. How do I get this key? Where do I store it? How do I use it for my decryption? Using JSP. Thanks! Hello! I think you misunderstand something. DES is an encryption algorithm, while MD5 is a hashing algorithm. DES means you take a plaintext (password), apply a function to it using the key as a parameter and get a ciphertext. Only using the exact same key you can get the plaintext back. MD5 takes the plaintext and calculates a hash-value of fixed size. There is no way to recompute the original plaintext from the hashcode. It is a one-way function. Daniel OK then let's talk DES since that's what we'd use since I need to reverse it. Questions still apply. Thanks for the response. The answer depends entirely on how the 3rd party app is encrypting the information, and what information you have at your end prior to receiving the data from the 3rd party app. --greg OK let me expound a little bit on the scenario. A 3rd party application has a varierty of means of encrypting a string value they want to send to me. 3DES, MD4, MD5 and about 20 other options. They are going to take this string and encrypt it with one of these methods. I should receive the key that they used to encrypt the string so that I can read the encrypted string over the URL, then apply the string to the encryption key to translate it back to a normal readable string. Currently we built our own hash table and are translating characters to 3 digit numbers, adding the time as an int and then multiplying by an 18 digit prime. Thanks for the responses. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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