> For the complete documentation index, see [llms.txt](https://zypher-network.gitbook.io/zypher-network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zypher-network.gitbook.io/zypher-network/developer-support/ai-game-demo/zk-sdks/secret-engine/shuffle.md).

# Shuffle

A zk-powered shuffle for cards

### Contents

Players take turns to encrypt and shuffle cards, resulting in a deck which is “sealed” & randomly ordered; it offers a superior solution that traditional RNGs, i.e.VRF cannot.

#### mental poker

The mental poker protocol is not a single protocol, but rather a collection of sub-protocols, each responsible for a specific action.

* Key Generation: – Generate a public-private key pair for each player. – Aggregate all players’ public keys to generate a single public key.
* Masking:
  * A masking function is an ElGamal encryption function under an ag- gregated public key.
* Shuffle and re-masking: – Perform shuffling operations to randomize the cards. – Re-mask the shuffled cards.
* Unmask: – Decode the cards to obtain the real card information.

### zk-shuffle as a service