mongodb - Rails: storing encrypted data in database -

i want encrypt database because confidential data being stored. use mongodb mongoid. possible kind of database? , alternatives can recomend, if not?

p.s. main purpose is: if hack server , steal db, unencryptable.

update: nickh, found many soultions activerecord, nothing mongoid , other mongo clinets. great find soultion mongo , mongoid!

i have gotten attr_encrypted working mongo , mongoid. takes few tweaks.

make sure of encrypted_ fields automatically created attr_encrypted explicitly created in model. instance, if have:

    attr_encrypted :email, :key => 'blah blah blah', :encode => true 

you need have:

    field :email, :type => string     field :encrypted_email, :type => string 

also notice need tell encode encrypted string otherwise mongo complain loudly.

lastly, if you're encrypting hash, this:

    field :raw_auth_hash, :type => hash     field :encrypted_raw_auth_hash, :type => string      attr_encrypted :raw_auth_hash, :key => 'blah', :marshal => true, :encode => true