As per Ethicalhackx‘s lecture notes and slides, the following are the elements of information security.

1. Confidentiality
2. Integrity
3. Availability
4. Authenticity
5. Non-Repudiation

I am not going in details of them. However, I want to briefly define them as mentioned in page 6 of lecture notes and slides.

1. Confidentiality means “Authorized to have access“.
2. Integrity means “Trustworthiness of Data or resources“.
3. Availability means “Available when required“.
4. Authenticity means “Quality of being genuine“.
5. Non-Repudiation means “Guarantee or Assurance“.

Credits: Ethicalhackx