It is debatable whether any software system is capable of defeating a skilled and persistent hacker. Hackers can be defeated if the system is physically disconnected from networks whenever network access is not required. As well as hackers, a variety of eavesdroppers can monitor data. While the digital mobile phone network is reasonably secure, the analog system can be monitored. The first computer bug was a moth that got caught in the circuitry of one of the first computers.
Modern bugs are metaphorical.
This means that the date 1 January 2000 will be stored as 000101. If you sort transactions based on date, they will not be in chronological order. The millenium bug may cause additional problems. The UC student record system contains a millenium bug. To check for bugs it is necessary to run test data through the program to ensure it operates properly.