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 !

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.

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.