BUAA Crypto Experiment

Codes and reports for BUAA Cryptography Experiment in 2022 Spring.

Directions

• Most programs are written in Python, other programs are written in C due to efficiency issues.
• Due to the introduction of OJ Platform from 2022 Spring, the code has input and output requirements, and the course is more standardized.
• On the names of dictionaries and files
  • ex# stands for experiment #
  • c# stands for question # of the experiment, and it is compulsory
  • op# stands for question # of the experiment, and it is optional
  • s# stands for step # of a problem
• Learning and improving are encouraged, but DO NOT COPY COMPLETELY !

Codes

File name clearly shows what file contains.

Followings are directions of some special files.

• ex2/op10

  • ex2/op10 - only prints the result
  • op10/s1 & op10/s2 - shows the derivation step
  • op10/s3 - to split text by words (required wordninja)
  • more information can be found in report.

• ex3/des

  • des_v1 - original version without optimization
  • des_v2 - optimized version by Python (actually it didn't work)
  • des_v3 - optimized version by C++ (just rewrite in C++)
  • des_v4 - optimized version by C (SPbox optimization)

• ex3/op3

  • ex3/op3 - only prints the result
  • op3/s1 & op3/s2 - shows the derivation step
  • more information can be found in report.

• ex5

  • ex5/related - to answer the thinking questions
  • figures includes encrypted figures by the work mode of cbc & ecb
  • time_record - record times in sm4
  • print_2_excel - print record to excel
  • more information can be found in report.

• ex9/op5

  • ex9/op5 - only prints the result
  • op5/s1 & op5/s2 - generate pairs
  • more information can be found in report.

• callgraph - generate function call graph, see the program for usage examples.

Reports

• Reports for each experiment.
• Composed by Microsoft Office (Word & PowerPoint, with AxMath plugin).
• Simplified Chinese only.

Thanks

• Thanks to the guidance from teachers and assistants in Mathematical Fundamentals of Information Security.
• Thanks to the guidance from teachers and assistants in Cryptography and Cryptography Experiments.
• Thanks to the sharings from Zheng Yaowei, Fu Yunhao, Huang Xiang.
• Thanks to the help of Cui Shibo.