import random as r def Encrypt(text, key): result = "" for i in range(len(text)): char = text[i] if(char==" "): result+=" " elif (char.isupper()): result += chr((ord(char) + key-65) % 26 + 65) else: result += chr((ord(char) + key - 97) % 26 + 97) return result def EncryptVerif(text, key): result = "" for i in range(len(text)): char = text[i] if(char==" "): result+=" " elif (char.isupper()): result += chr((ord(char) + key-65) % 26 + 65) else: result += chr((ord(char) + key - 97) % 26 + 97) return result def Decrypt(text, key): result = "" for i in range(len(text)): char = text[i] if(char==" "): result+=" " elif (char.isupper()): result += chr((ord(char) - key-65) % 26 + 65) else: result += chr((ord(char) - key - 97) % 26 + 97) return result def DecryptVerif(text, key): result = "" for i in range(len(text)): char = text[i] if(char==" "): result+=" " elif (char.isupper()): result += chr((ord(char) - key-65) % 26 + 65) else: result += chr((ord(char) - key - 97) % 26 + 97) return result def testEncrypte(x): if(Encrypt("Hello world",2)!="Jgnnq yqtnf"): return False if(Encrypt("Scripted",9)!="Blarycnm"): return False for i in range(x): l="" cle=r.randint(1,26) for i in range(r.randint(1,10)): l+=chr(r.randint(97,122)) if(Encrypt(l,cle)!=EncryptVerif(l,cle)): return False return True def testDecrypte(x): if(Decrypt("Hello world",2)!="Jgnnq yqtnf"): return False if(Decrypt("Scripted",9)!="Blarycnm"): return False for i in range(x): l="" cle=r.randint(1,26) for i in range(r.randint(1,10)): l+=chr(r.randint(97,122)) if(Decrypt(l,cle)!=DecryptVerif(l,cle)): return False return True print(Decrypt("Scripted",4))