I never said it was impossible, but it is impractical. The reason why it's impractical is side channel attacks are not easy, in spite of the claims of the artic

I never said it was impossible, but it is impractical. The reason why it's impractical is side channel attacks are not easy, in spite of the claims of the article. If you have the knowledge and skill required to correctly preform a successful side channel attack (passive or induced), a free bus pass, or even an illicit business of selling fake/dupe bus passes, is certainly not worth your time. You can easily make a small fortune working legitimately with skills like that.