My solution is to doubly encrypt a 7zip file with 2 separate passwords and send each password to a different individual so that they need to cooperate in order

My solution is to doubly encrypt a 7zip file with 2 separate passwords and send each password to a different individual so that they need to cooperate in order to access the information. I wrote about it a while ago on my blog here: https://kylekelly.com/posts/share-your-passwords/ https://kylekelly.com/posts/share-your-passwords/ I'm wondering if I missed an obvious security issue with this solution?