Which of the following is not a dimension of e-commerce security provided by encryption?

Solution (By Examveda Team)

The correct answer is A: availability
Let's break down why with an easy explanation:

E-commerce security aims to protect online transactions and data.
Encryption is a key tool in achieving this security, and it provides several protections.

* Confidentiality: Encryption makes sure that only the intended recipient can read the message. It scrambles the data so others can't understand it. So confidentiality is a dimension of e-commerce security provided by encryption.
* Message integrity: Encryption can ensure that the message hasn't been altered during transmission. If someone tries to tamper with it, the recipient will know. So message integrity is a dimension of e-commerce security provided by encryption.
* Nonrepudiation: Encryption, along with digital signatures, can make sure that the sender cannot deny sending the message. It proves they sent it. So nonrepudiation is a dimension of e-commerce security provided by encryption.
* Availability: This refers to making sure the system and data are accessible to authorized users when they need them. While security measures can *impact* availability (e.g., strong passwords might make it harder to log in if forgotten), encryption itself doesn't directly guarantee availability. Other measures like backups and redundancy are more crucial for availability.

Therefore, availability is NOT directly provided by encryption itself.