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