Steganography is the technique of hiding secret data within an ordinary, non-secret, file or message in order to avoid detection. It's essentially being able to hide in plain sight. The question is referring to a hidden file not some form of encryption, Steganography is not an encryption method but can be used with encryption to add an extra step for protecting data.
Homomorphic encryption - An encryption algorithm designed to allow calculations to be performed on the encrypted data without requiring access to a secret key to decrypt the data. The result of such a computation remains in encrypted form, and can at a later point, the original data can be accessed with the proper decryption key. This allows critical and sensitive data to be outsourced to third-parties without posing a serious risk to the original owner of that data.
Cipher suite - Algorithms/Instructions required to enable secure network connections between servers and clients through TLS(SSL).
Blockchain - A shared, immutable ledger that facilitates the process of recording transactions and tracking assets in a business network.