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cl-ement05 committed Mar 21, 2021
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35 changes: 29 additions & 6 deletions Manual.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -16,22 +16,24 @@ Manual organisation :


Thanks for choosing ZCrypt !
This software was developped by Clement and has been released the 24th of February 2020
This software was developped by Clement and has been released the February, the 24th 2020

ZCrypt is a progam that uses Python engine to run
Please, take into consideration that, all the files linked to this app or which were created by this app will be saved in the same location that the software
So, if you want to decrypt a message, please paste the file you want to decrypt in the software's location


Crypting Engine :
Now Let's talk a bit about cryptography...
Here is how ZCrypt encrypting engine works
When you type, your message, ZCrypt make an analysis of each character
After that, he assigns to each character its corresponding Ascii number and changes this number by adding or removing another number : the key !
When you type your message, ZCrypt makes an analysis of each character
After that, it assigns to each character its corresponding Ascii number and changes this number by adding or removing another number : the key !
The program deicdes to add or remove a number considering one more time the key : if the key is a pair number, it removes the key from the original Ascii but if the key is an impair number, it adds the key to the Ascii code of the character
After that, ZCrypt splits the final encrypted ascii in three number (eg : 126; 093; 105...) and for each character of this Ascii number, it transforms it in its binary version
At the end, we get three binary codes (3 * 8) so a total lenght of 24 numbers
At the end, we get three binary codes (3 * 8) so a total lenght of 24 numbers for one chacarcter
Recap, let's take an example your message is "a" : a ==> 97 ==> 97 + 25(key) ==> 122 ==> 00000001 (binary of 1) 00000010 (binary of 2) 00000010 (binary of 2)


Command usage :
You can type different commands to use ZCrypt
Here are they : encrypt, decrypt, settings, instructions, showErrors and manual
Expand All @@ -56,9 +58,30 @@ If you want to change this value, type "set X" where is X is one more time the n
If you want to go back to the software main page, type exit and will be able to encrypt or decrypt messages again
!!! Warning : Since the commands (enrypt or decrypt) are not registered in the settings, crypting or decrypting messages is not possible when you are in the settings

The instructions command explains very shortly and easily how the program works and how to use it
The instructions command explains shortly how the program works and how to use it
Please consider reading it if this is your first time using ZCrypt
If you need help, you can always read it

Sometimes ZCrypt is not able to decrypt your message
When this happens, you can type showErrors to understand why your file can't be decrypted
When you type this command, ZCrypt returns you error codes (eg : E301; E421...) which each of them is linked to a specific reason ZCrypt could not decrypt your file
This is usually because the file does not match ZCrypt requirements
Here is the list of the Error Codes and their meaning :

I) Errors starting with E1XX : Operating-System-Level error
- E101 : your file does not exist or is corrupted and cannot be read by your system

II) Errors starting with E2XX : File does not match basic ZCrypt requirements
- E201 : the file has more or less than 5 lines (and ZCrypt needs 5 lines in the file)
- E202 : one or more lines couldn't be read (convert to string impossible so unknow character type)

III) Errors starting with E3XX : File does not match advanced requirements of ZCrypt (easier to fix)
- E301 : the first line (which contains time informations) couldn't be read (convert to string impossible so unknow character type)
- E302 : the first line that contains time informations is less or more than 29 characters long
- E313 : the fourth line which contains the encrypting key couldn't be converted to a number which made ZCrypt unable to understand it
- E314 : the fourth line that contains encrypting key is less or more than 9 characters long
- E325 : the fith line which contains the whole message couldn't be converted to a specific type of character which led to a an impossible understanding
- E326 : the fith line that contains the whole message does not contain a ';' wich is needed, at least one time, to decrypt the message




Expand Down
167 changes: 130 additions & 37 deletions Programme.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
import os
from random import *
import string
from printy import *

count = 0
check = 0
Expand Down Expand Up @@ -31,7 +32,8 @@ def fileCheck() :
file = open(file_name, 'r+')
file_pass = True
except :
Error_Code.append("")
Error_Code.append("E101")
file_pass = False

if file_pass == True :
text = file.readlines()
Expand All @@ -41,6 +43,7 @@ def fileCheck() :
pass
elif len(text) > 5 or len(text) < 5 :
file_pass = False
Error_Code.append("E201")

#Assigns a variable name with the line number to each element (line) in the file
if file_pass == True :
Expand All @@ -57,6 +60,49 @@ def fileCheck() :
line5 = text[4]
count += 1

if file_pass == True :
try :
str1 = str(line1)
str2 = str(line2)
str3 = str(line3)
str4 = str(line4)
str5 = str(line5)
except :
Error_Code.append("E202")
file_pass = False


if len(line1) == 29 : #29 because there is a \n at the end of the line and the n is a character
try :
test21 = int(line1[:28])
except :
file_pass = False
Error_Code.append("E301")
else :
file_pass = False
Error_Code.append("E302")

if len(line4) == 9 :
try :
test = int(line4, 2)
except :
file_pass = False
Error_Code.append("E313")
else :
file_pass = False
Error_Code.append("E314")

if ';' in line5 :
try :
test3 = int(line5[:24])
except :
file_pass = False
Error_Code.append("E325")
else :
file_pass = False
Error_Code.append("E326")

if file_pass == True :
return file_pass, line1, line2, line3, line4, line5


Expand Down Expand Up @@ -121,7 +167,8 @@ def encryptTime() :
if current_time[element] == '/' or current_time[element] == ':' or current_time[element] == ' ' :
pass
else :
print("Error")
printy("Sorry there was an error. Please try again", "m")
sleep(4)
exit()

#If the try passes and the current element is an integer (so a number that is part from the date), encyption starts
Expand Down Expand Up @@ -230,7 +277,7 @@ def encrypt() :

#Spaces are encoded as is they were "~" (its ascii is 126) so to avoid errors, the programm does not support this character
if ascii_chr == 126 :
print("Error ! Your message contains a character that is not supported")
printy("Error ! Your message contains a character that is not supported", "m")
break

#If the key is a pair number
Expand Down Expand Up @@ -279,16 +326,19 @@ def encrypt() :

final_message_binary.append(letter_str)

print("Your key is:", key_num)
printy("Your key is :", 'c', end = ' ')
printy(str(key_num), 'c')
return final_message_binary

#Get all settings and variables and starts the writeFile function to apply changes with the variables
def prepareOutput() :
encryptTime()
#Rajouter ici la fonction qui va faire tt les cmd liées au serv
encryptSender()
encryptReciever()

txt = False
overwriteOut = False
message_str = ''
for i in range(len(final_message_binary)) :
message_str += final_message_binary[i]
Expand All @@ -299,9 +349,33 @@ def prepareOutput() :
txt = True

if txt == True :
writeFile(final_time_encr, sender_encr, reciever_encr, key_bin, message_str)
try :
testfileOW = open(file_output, "r")
overwriteOut = True
except :
overwriteOut = False

if overwriteOut == True :
printy("Warning !", 'y', end = ' ')
printy(file_output, 'y', end = ' ')
printy("already exists.", 'y')
printy("If you continue the encryption process, the existing file will be overwritten", 'y')
printy("This will irremediably delete its current data", 'y')
printy("We highly recommend you to backup this file if personnal infos are stored on it", 'y')
printy("Are you sure you want to continue ? (y/n)", 'y', end = '')
firstanswer = input(" ")
if firstanswer == "y" :
printy(file_output, 'y', end = ' ')
printy("will be overwritten !! Proceed anyway ? (y/n)", 'y', end ='')
confirmation = input(" ")
if confirmation == "y" :
writeFile(final_time_encr, sender_encr, reciever_encr, key_bin, message_str)
else :
printy("OK. Encryption aborted", 'c')
else :
printy("OK. Encryption aborted", 'c')
else :
print("Error ! The name of the file you want to save is incorect. Please try another one !")
printy("Error ! The name of the file you want to save is incorect. Please try another one !", 'm')

#Write all changes to the file using the settings prepared by the prepareOutput function
def writeFile(time_w, sender_w, recipient_w, key_w, message_w) :
Expand All @@ -318,6 +392,8 @@ def writeFile(time_w, sender_w, recipient_w, key_w, message_w) :
file_w.write(message_w)
file_w.close()

printy("Done ! Your message has been securely encrypted !", 'n')


#In this part, all the function used for decrypting are defined

Expand Down Expand Up @@ -575,23 +651,23 @@ def decrypt() :

#This function gather all decrypted variables processed by the other functions (decryptTime, decrypt...) and prints everything in a user friendly presentation
def printDecrypted() :
print("We finished decrypting your file !")
print("Here is everything you need to know about it :")
printy("We finished decrypting your file !", "n")
printy("Here is everything you need to know about it :", "n")
print("")

print("This message was created ", end = '')
print(day_decrypted, month_decrypted, year_decrypted, sep = '/', end = ' ')
printy("This message was created ", "c", end = '')
print(day_decrypted, month_decrypted, year_decrypted, "c", sep = '/', end = ' ')
print("at", end = ' ')
print(hour_decrypted, min_decrypted, sec_decrypted, sep = ':')
print(hour_decrypted, min_decrypted, sec_decrypted, "c", sep = ':')
print("")

print(sender_decr, "sent it !")
print(sender_decr, "sent it !", "c")
print("")

print(reciever_decr, "should recieve it !")
print(reciever_decr, "should recieve it !", "c")
print("")

print("And the message is :", final_decrypted)
print("And the message is :", final_decrypted, "c")


def settings() :
Expand All @@ -604,38 +680,39 @@ def settings() :
print("Your encrypted messages are currently saved with the following name :", file_output)

else :
print("Error ! The option you tried to view does not exists or does have a number assigned to it")
printy("Error ! The option you tried to view does not exists or does have a number assigned to it", "m")


elif 'set' in settings_cmd and len(settings_cmd) == 5 :
if settings_cmd[4] == '1' :
file_output = input("Please enter the name of file you want to be saved as. Don't forget to ad (.txt) at the end ! : ")
printy("Done ! The name of the output file has been successfully modified", "n")

else :
print("Error ! The option you tried to view does not exists or does have a number assigned to it")
printy("Error ! The option you tried to view does not exists or does have a number assigned to it", "m")


elif settings_cmd == 'exit' :
stop = True

else :
print("Error ! Either this command is unknown either it does not use the needed format ! See the manual to learn more ")
printy("Error ! Either this command is unknown either it does not use the needed format ! See the manual to learn more ", "m")

return stop


#Welcome screen
print("Welcome to ZCrypt !")
print("Here are the commands you can use : encrypt, decrypt and you can also see the user manual by typing manual")
print("If this is your first time using the program, please consider using the \"instructions\" command")
print("If you want to access the settings, type \"settings\"")
print("You can also exit the program jsut by typing \"quit\"")
printy("Welcome to ZCrypt !", "n>")
printy("Here are the commands you can use : encrypt, decrypt and you can also see the user manual by typing \"manual\"", "n>")
printy("If this is your first time using the program, please consider using the \"instructions\" command", "n>")
printy("If you want to access the settings, type \"settings\"", "n>")
printy("You can also exit the program by typing \"quit\"", "n>")
last_key = 15 #This line runs just once, at the programm start because the encryption module needs the last key (and there is no last key at the first time)


while True :
print("")
print("Please input a command ")
printy("Please input a command ", "c")
command = input(">>> ")

if command == "encrypt" :
Expand All @@ -650,33 +727,34 @@ def settings() :


elif command == "decrypt" :
print("Please specify the COMPLETE name of the file with the .txt end !")
Error_Code.clear()
printy("Please specify the COMPLETE name of the file with the .txt end !", "c")
file_name = input()
fileCheck()
if file_pass == True :
print("Your file was successfully checked and no errors or file integrity violations were found. Continuing...")
printy("Your file was successfully checked and no file integrity violations were found. Continuing...", "n")
keySettings()
dateSettings()
decryptSender()
decryptReciever()
decrypt()
printDecrypted()
else :
print("Error ! Either the file specified does not use the needed format for the program either it is corrupted.")
sleep(1)
printy("Error ! Either the file specified does not use the needed format for the program either it is corrupted.", "m")
sleep(0.7)
print("Aborting...")
sleep(1)
sleep(0.7)

elif command == "settings" :
stop = False
print("\n", "\n", "\n", "\n")
print("You are now in the settings !")
print("Here, are the options you can change :")
print(" - 1: encrypted file name\n")
printy("You are now in the settings !", "c")
printy("Here, are the options you can change :", "c")
printy(" - 1: encrypted file name\n", "c")

print("If you want to see the current value of an option, type \"see\" followed by the number linked to the option")
print("If you want to change this value, type \"set\" followed by the number linked to the option")
print("If you want to exit this page, you can also type \"exit\"")
printy("If you want to see the current value of an option, type \"see\" followed by the number linked to the option", "c")
printy("If you want to change this value, type \"set\" followed by the number linked to the option", "c")
printy("If you want to exit this page, you can also type \"exit\"", "c")

while stop != True :
settings_cmd = input(">>>")
Expand All @@ -685,7 +763,22 @@ def settings() :


elif command == "showErrors" :
pass
if len(Error_Code) == 1 :
print("We are sorry to hear that your file has a problem")
print("Please consider reading the manual by typing manual and search for the Error Code ", Error_Code[0])
print("Otherwise, ask the sender to send the message again")
elif len(Error_Code) > 1 :
print("We are sorry to hear that your file has some problems")
print("Here are all the codes corresponding to the errors we faced")
all_errors = ''
for x in Error_Code :
all_errors += x
all_errors += ' '

print("Please consider reading the manual by typing manual and search for these Error Codes ", all_errors)
print("Otherwise, ask the sender to send the message again")
else :
printy("Your file has been decrypted without any errors.", "c")

elif command == "manual" :
manual_file = open("Manual.txt", "r")
Expand All @@ -696,7 +789,7 @@ def settings() :
elif command == "instructions" :
print("Dear User, welcome to ZCrypt !")
print("ZCrypt was developped by Clement")
print("This software was created in order to encrypt messages easily, send it and decrypt it quickly !")
print("This software was created in order to encrypt messages easily, send it and decrypt them quickly !")
print("")

print("If you want to encrypt a file, remeber that it will be saved in the same location of this program")
Expand All @@ -715,5 +808,5 @@ def settings() :
print("Enjoy !")

elif command == 'quit' :
print("Thanks for using ZCrypt ! See you soon...")
printy("Thanks for using ZCrypt ! See you soon...", "c")
exit()

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