2021 autumn Information Security Experiment 1 (password and hiding technology)

Senior network security operation , Need to use python Of simplegui Implement a simple interface .

1. The first question is

Code ：

import PySimpleGUI as sg  #  The abbreviation of the default library on the official website is sg, It is recommended to keep the same when using 


#  Define the layout of the window 
layout = [[sg.Text(' Plaintext '),sg.InputText(key="value")],
          [sg.Text(' encryption '), sg.InputText(key="value1")],
          [sg.Text(' Decrypt '),sg.InputText(key="value2")],
          [sg.Button(' encryption '),sg.Button(' Decrypt '),sg.Button(' Cancel ')]]

#  Create a display window 
window = sg.Window(' Ciphertext conversion ', layout)

# Encryption code 
def add(string,k):
    s=""
    c=list(string)
    for i in range(0,len(c)):
        s=s+chr((ord(c[i])+k-ord('a'))%26+97)
    return s

# Decryption code 
def debug(string,k):
    s=""
    c=list(string)
    for i in range(0,len(c)):
        s=s+chr((ord(c[i])-k+26-ord('a'))%26+97)
    return s

# Window response 
while True:
    event, values = window.read()
    data = add(values['value'], 3)
    sdata = debug(data, 3)
    if event in (None, ' Cancel '):
        break
    elif event in (' encryption '):
        window["value1"].update(data)
    else:
        window["value2"].update(sdata)

window.close()

effect ：

The second question is

Code ：

import PySimpleGUI as sg  #  The abbreviation of the default library on the official website is sg, It is recommended to keep the same when using 


#  Define the layout of the window 
layout = [[sg.Text(' Plaintext '),sg.InputText(key="value")],
          [sg.Text(' encryption '), sg.InputText(key="value1")],
          [sg.Text(' Decrypt '),sg.InputText(key="value2")],
          [sg.Button(' encryption '),sg.Button(' Decrypt '),sg.Button(' Cancel ')]]

#  Create a display window 
window = sg.Window(' Ciphertext conversion ', layout)

# encryption 
def add(string):
    s=""
    c=list(string)
    for i in range(0,len(c)):
        s=s+chr(((ord(c[i])-ord('a'))*3+5)%26+97)
    return s

# Decrypt 
def debug(string):
    s=""
    c=list(string)
    for i in range(0,len(c)):
        for j in range(0,3):
            if ((ord(c[i])-ord('a')-5+26*j)%3)==0:
                s=s+chr(int((ord(c[i])-ord('a')-5+26*j)/3+97))
                break
    return s

# Window response 
while True:
    event, values = window.read()
    data = add(values['value'])
    sdata = debug(data)
    if event in (None, ' Cancel '):
        break
    elif event in (' encryption '):
        window["value1"].update(data)
    else:
        window["value2"].update(sdata)

window.close()

effect ：