Cryptography Course Design

School of Computer Science, Huazhong University of Science and Technology

in 2018

SPN

Implementation of basic SPN algorithm and cryptanalysis

File Name：SPN_inital.cpp

Programming Description：

Function 1: SPN Encryption

Input: plaintext

Output: ciphertext
Function 2: SPN Decryption

Input: ciphertext ( F1's output )

output: plaintext ( F1's input )
Function3、4: Linear Attack, Differential Attack

Instead of 24 - bit key exhaustion, only 8 - bit keys are obtained

File Name：SPN_analyse.cpp

Programming Description：

Function 1: SPN Encryption

Input: plaintext

Output: ciphertext
Function 2 Linear Attack
1. Get the 8-bit key and the analysis time
2. Through method of exhaustion, get 32 key, and the analysis time
Function 3 Differential Attack
1. Get the 8-bit key and the analysis time
2. Through method of exhaustion, get 32 key, and the analysis time

Implementation of Enhance SPN algorithm

File Name：SPN_plus.cpp

Programming Description：

Input: Two 16-bit hexadecimal Numbers separated by Spaces
Output: 32-bit hexadecimal ciphertext and hexadecimal plaintext separated by empty lines

RSA

-- File Name：rsa.cpp

Programming Description:

Output:

Public key e n

Private key D p Q

Plaintext m

Ciphertext C

Plaintext results in different decryption methods

Rainbow table

-- File Name：rainbow.cpp

The main function in the source program contains two test programs

Manually enter the test program after the rainbow table is generated
An automated test program behind the rainbow table