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I am using md5 to encrypt the password. then, how to get back the original string if i need it. is there any decryption possible?

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In a word: no. If you want it to be reversible, this is the wrong approach. MD5 is a hashing algorithm, not an encryption one. Don't use MD5 for passwords.

Use actual encryption, like AES or Blowfish.

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You cannot decrypt one-way hashes like MD5 - The best you can do is brute-force them or run a dictionary through and compare the values for matches.

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so, are you going to say that this application is some kind of brute force?
@HendryTanaka Sorry for taking long to answer but yes, you need to brute force them until you find a match or compare the value to an already-calculated mapping table (e.g. Rainbow tables)

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