Company A and company B need to communicate in a secure way.

For each of the following scenarios, you need to identify and justify which of the following four states has been achieved:

Confidentiality. 2- Integrity. 3- Authenticity. 4- Non-repudiation.

Scenario A:

Company A sends an encrypted message to Company B using a shared key. (Assumption: Both companies maintain the secrecy of the shared key.)

Scenario B:

Company A encrypts a hashed message using its own private key.

Scenario C:

Company A hashes a message and sends the hash and the message through two channels. Company B receives the message and hashes it using the same hash function. After comparing the received hash to the generated hash, they find an exact match.