asp.net mvc - Encrypting information to a hidden field in an MVC application -

i working on mvc project. need encrypt information , store in hidden field. solution being deployed in intranet scenario , information private not critical encrypting best practice. using windows authentication.

to prevent user seeing these values using rijndael encryption method create encrypted string converting encrypted value hex string , placing in hidden field.

i hard-coding values key , iv (storing them in web.config - , encrypting). have read iv should different in every encryption. not want have start storing each iv server side , retrieving on post unless have to.

how critical generate new iv key every request?

would there more suitable encryption algorithm not require generated values?

you can store key , iv values in database each user. prevent generating them on each request, make unique each employee accesed web application

regeneration make each midnight using windows service or sql job.