Discussion:Protocole cryptographique
Tout ou partie de cet article est issu de la traduction de l'article sous licence CC-BY-SA « (en) Cryptographic protocol » dans sa version du 03/05…
Tout ou partie de cet article est issu de la traduction de l'article sous licence CC-BY-SA « (en) Cryptographic protocol » dans sa version du 03/05/2022.
Consultez l'historique de la page originale pour connaître la liste de ses auteurs.
Cryptographie alternative
Je soumets ici un protocole alternatif d'échange de clé cryptographique. J'invite les intéressés à en trouver la faille, ce qui ne doit pas être bien difficile. 2A01:CB19:707:3200:1C11:A5C3:9BFF:5910 (discuter) 11 août 2024 à 12:28 (CEST) Ianop.
A = 127
B = 179
X = 74 (2 * 37)
Y = 86 (2 * 43)
AX = 127 * 74 = 9398
BY = 179 * 86 = 15394
T = 15394 + 9398 / 2 = 12396
AX, BY, T publiques.
Alice :
[(T - 74) + 127] - BY = - 2945
[(T - 74) + 127] - AX = 3051
C = 3051 - 2945 = 106
Bob :
[(T - 86) + 179] - BY = - 2905
[(T - 86) + 179] - AX = 3091
D = 3091 - 2905 = 186
Alice :
(3 * 127) + 106 = 487
106 + (127 + 74) = 307
Bob:
(3 * 179) + 186 = 723
186 + (179 + 86) = 451
Alice : 487 à Bob
Bob : 451 à Alice
Bob : 487 + 723 = 1210
Alice : 451 + 307 = 758
Bob : 1210 + 12 = 1222 (cryptage)
1222 à Alice
Alice : 1222 - 758 = 464
758 - 464 = 294
294 + 74 = 368
368 + 16 = 384 (cryptage)
384 à Bob
Bob : 384 + 86 + [12] = 482
482 à Alice
Alice : 482 - [16] = 466
Clé = 466 - (127 + 74) = 265 (179 + 86)
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