1. Davies, D.W., Price, W.L.: Security for Computer Networks — An Introduction to Data Security in Teleprocessing and Electronic Funds Transfer. 2nd Edition. Wiley, Chichester (1989)
2. Denning, D.E.R.: Cryptography and Data Security. Addison-Wesley, Reading, MA (1982)
3. Pfleeger, C.P.: Security in Computing. 2nd Edition. Prentice-Hall, Englewood Cliffs, NJ (1997)
4. Seberry, J., Pieprzyk, J.: Cryptography — An Introduction to Computer Security. Prentice-Hall, Englewood Cliffs, NJ (1989)
5. Menkus, B.: Understanding the Use of Passwords. Computers & Security 7 (1988) 132–136