| GMD | Text |
| Language | Eng |
| Classification | 001.64 C786 |
| Publisher | New York, McGraw-Hill, c1989 |
| Subject | Computer security.Telecommunication systems -- Security measures. |
| Series | McGraw-Hill communications series. |
| Description | xix, 411 p. : ill. ; 24 cm. |
| ISBN | 9780070129269 |