Multiple choice technology security

If a database is protected from modification using only symmetric encryption, someone may still be able to mount an attack by:

  1. Moving blocks of data such that a field belonging to one person is assigned to another

  2. Changing the encryption key so that a collision occurs

  3. Using the public key instead of the private key

  4. Arranging to intercept the public key in transit and replae it with his own
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A Correct answer
Explanation

When symmetric encryption only protects data from being read, an attacker can still rearrange encrypted blocks without decrypting them. By moving ciphertext blocks around, fields can be swapped between records - for example, assigning someone else's encrypted account balance to your own record. This works because the encryption doesn't authenticate or preserve the structure of the data.

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