Fisch, White, and Pooch [319] define four levels of log sanitization.

A. Simple sanitization, in which all information except the commands issued by anintruder are deleted

B. Information-tracking sanitization, in which sensitive information is entered into asymbol table as it is encountered, a unique identifier is assigned, and whenever thatinformation is encountered it is replaced with the associated identifier

C. Format sanitization, in which compressed or encoded data is transformed into itsoriginal form, the original form is sanitized using information-tracking sanitization, andthe resulting data is returned to its transformed format

D. Comprehensive sanitization, in which all data is analyzed and sanitized as ininformation-tracking and format sanitization

Discuss the level of anonymity of each level of sanitization. Which level could be automated,and to what degree would human oversight be required?