String manipulation using MD5 in rails 3 [closed]

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I have a big string

approx 4000 characters

i want encrypt and decypt it using MD5 because of i want to do convert in a small string please help me a lot of finding i found Base64 but it is not our solution please any one help me

my_string="abcdefghhhhhhhhhhhhhhhhhhhhhh"
      Base64.encode64(my_string)

it gives us very lengthy string.

Answer 1

Encrypting a string will not make it smaller, it will at best be the same length. I think what you are looking for is a way to compress your string. That aside, MD5 is a one-way hashing algorithm, that means that it is designed, so there is now way of recovering the source string (it turns out that it was designed rather poorly).

Answer 2

MD5 is a one-way hash, you can't decrypt it.

To encode a string use Digest::MD5.hexdigest('foobar') but for most purposes I'd say use a better hashing algorithm; MD5 has been broken for a long time.