We need always to hide somthing so that we can protect a secret. Give the elments that need to hidden to protect correcl

[answerhappygod]

We need always to hide somthing so that we can protect a secret.
Give the elments that need to hidden to protect correclty a secret
if we use the following methods to protect a secret:
1- Symmetric algorithm and symmetric key
2- Asymetric algorithm, private key, public key:
3- Staganography algorithm