# Tag Info

Here's an artificial example: Start with some secure encryption scheme with encryption function $\mathcal{E}(\cdot)$, and construct a new scheme with encryption function $\mathcal{E}'(\cdot)$, which for any input message $m$ copies the first bit, $b$, of the message, and outputs $b||\mathcal{E}(m)$, where $||$ denotes concatenation. For such a scheme, ...