The paper by Leslie Lamport describes a method for user password authentication that remains secure even if an intruder can read system data or tamper with or eavesdrop on the communication between the user and the system. The method relies on a secure one-way encryption function, which is implemented using a microcomputer in the user's terminal. The system stores the encrypted form of the password, and the user authenticates by sending the original password to the system, which then decrypts it using the one-way function. To prevent eavesdropping and tampering, a sequence of 1000 distinct passwords is used, where each password is the result of applying the one-way function to the previous one. This sequence ensures that any attempt to impersonate the user will fail, as the system can always compute the next password from the current one. The method also includes robustness features to handle system crashes and communication failures, ensuring that the system can detect and correct any synchronization issues. The implementation involves the user choosing a random initial password and computing the required sequence of encrypted passwords, which are then sent to the system.The paper by Leslie Lamport describes a method for user password authentication that remains secure even if an intruder can read system data or tamper with or eavesdrop on the communication between the user and the system. The method relies on a secure one-way encryption function, which is implemented using a microcomputer in the user's terminal. The system stores the encrypted form of the password, and the user authenticates by sending the original password to the system, which then decrypts it using the one-way function. To prevent eavesdropping and tampering, a sequence of 1000 distinct passwords is used, where each password is the result of applying the one-way function to the previous one. This sequence ensures that any attempt to impersonate the user will fail, as the system can always compute the next password from the current one. The method also includes robustness features to handle system crashes and communication failures, ensuring that the system can detect and correct any synchronization issues. The implementation involves the user choosing a random initial password and computing the required sequence of encrypted passwords, which are then sent to the system.