Is it possible to decrypt MD5 hashes?

Question

Someone told me that he has seen software systems that:

1. retrieve MD5 encrypted passwords from other systems;
2. decrypt the encrypted passwords and

Answer 1

You can find online tools that use a dictionary to retrieve the original message.

In some cases, the dictionary method might just be useless:

• if the message is hashed using a SALT message
  
• if the message is hash more than once
  

For example, here is one MD5 decrypter online tool.