From ce4b7fecf04a18a0aab30364af3fc01710f2336b Mon Sep 17 00:00:00 2001
From: marcellus <msimon_fr@hotmail.com>
Date: Thu, 22 May 2025 11:22:17 +0200
Subject: update: Thursday 4 May, 11:22:17 from IUseArchBTW

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 CHIFR/TD/TD5 - Kyber.md | 22 ++++++++++++++++++++++
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 create mode 100644 CHIFR/TD/TD5 - Kyber.md

diff --git a/CHIFR/TD/TD5 - Kyber.md b/CHIFR/TD/TD5 - Kyber.md
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+# Le cryptosystème Kyber
+## STA Flashback
+$$
+\begin{align}
+&a = 4X^2 + 7X + 1 \\
+&b = 3X^2 + 2
+\end{align}
+$$
+### a)
+- $a+b = 7X^2 + 7X + 3$
+- $a \cdot b = 12X^4 + 8X^2 + 21X^3 + 14X + 3X^2 + 2 = 12X^4 + 21X^3 + 11X^2 + 14X + 2$
+### b)
+$X^3 = -1, \, X^4 = -X$
+- $a+b = 7X^2 + 7X + 3$
+- $a\cdot b = -12X -21 + 11X^2 + 14X + 2 = 11X^2 + 2X -19$
+### c)
+$X^3 = -1, \, X^4 = -X$
+- $a+b = 7X^2 + 7X + 3$
+- $a\cdot b = 2X^2 + 2X + 8$
+
+## Kyber
+### a)
-- 
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