coder_du_viginere.py

Created on January 23, 2024
1.24 KB
def prepare(TexteClair):
    li1=["âà","éèêë","îï","ô","ûü","ç"]
    li2=["A","E","I","O","U","C"]
    i=0
    # Remplacement des caractères accentués éventuels
    for mot in li1:
       repl=li2[i]
       for lettre in mot:
           TexteClair=TexteClair.replace(lettre,repl)
       i+=1      
    for lettre in "',-;:!?.":   # Suppression des signes de ponctuation
        TexteClair=TexteClair.replace(lettre,"")
    TexteClair=TexteClair.upper()    # Passage en majuscules
    return TexteClair

Carre=[]
ligne=[]
for j in range(26):
    for i in range(26):
        ligne.append(chr(65+(i+j)%26))
    Carre.append(ligne)
    ligne=[]


TexteClair=str(input("entrez le texteclair"))
TexteClair=prepare(TexteClair)
lg_tc=len(TexteClair)
Cle=str(input("entrez la clef"))
lg_C=len(Cle)
bl=0                   
TexteCrypte=""


for i in range(lg_tc):
    lettre=TexteClair[i]
    if lettre==" ":
        bl+=1
        TexteCrypte+=" "
    else:
        j=(i-bl)%lg_C
        j=ord(Cle[j])-65
        h=ord(lettre)-65
        TexteCrypte+= Carre[h][j]


print ("             Texte de départ :")
print (TexteClair)
print
print ("             Clé :")
print (Cle)
print
print ("             Texte crypté :")
print (TexteCrypte)