Table 4.

Data desensitization and encryption policies of big data platform.

Name of strategy	Scope of data involved	Design of desensitization and encryption policy
Digital data	Operating revenue, key quantity...	Fuzzy rounding method or fuzzy percentage method
Structured data of fixed length	Identification card number, telephone number, name...	Replace or encrypt from the starting bit to the end of the specified length range
Text data of varying length	Address, electronic medical record, descriptive diagnosis (infectious disease)	Locating sensitive content, then replace or encrypt sensitive characters
Image data	Radiological, ultrasonic and pathological imaging data	In image files, encryption algorithm is used for desensitization and watermarking is configured
File data	Genomics, molecular protein data	Locating sensitive content and rename sensitive characters