Finding a Encryption Algorithm to encrypt users personal data -

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there personal service need encrypt user's data archived password able make database saved secret data.it meaningful can make sure software developer , manager can't users data.
it's easy can choice algorithm let user's password factor link encrypted data.but how user change password? on 1 hand, can't save user's password straightly(password encrypted md5 irreversible), on other hand, can't encrypt data again if password changed.
able do?thanks

update
hit situation when user forget password.it seems presupposition unreality.>_<
please consider haven't think of idea.
make question fallback "how use encrypted data in database make sure data owner can achieve it."
if not consider forget password, @samgak give idea @ question comment.
, now, can continue use users password key or find way deal new problem?


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