Perfect Engineers

What are the different types of attacks possible on a computer system(?) Define DES and draw related appropriate(?) diagram. Differentiate between encryption and decryption (something). Differentiate between public key and private key technologies(?) techniques (?) Define stegnography and describe stegnographic techniques(?)

Describe distributed computing/processing. Describe distributed data and the different categories of data diatribe. Differentiate between centralisation and decentralisation. Describe types of distributed systems. Describe private and public networks.