diff --git a/src/app/features/shared/components/ui/static-pages/ciphering/ciphering.component.ts b/src/app/features/shared/components/ui/static-pages/ciphering/ciphering.component.ts
index e29193fa..639d1fa0 100644
--- a/src/app/features/shared/components/ui/static-pages/ciphering/ciphering.component.ts
+++ b/src/app/features/shared/components/ui/static-pages/ciphering/ciphering.component.ts
@@ -25,7 +25,7 @@ export class CipheringComponent implements OnInit {
 	public prem: number;
 	public dico: string[];
 	public separatedCouples: any[];
-	public codingMatrice: string = '2 3 5 8';
+	public codingMatrice = '2 3 5 8';
 	private cipheredTextCIL: string;
 
 	constructor() {
@@ -193,8 +193,12 @@ export class CipheringComponent implements OnInit {
 	 * on entre une définition de matrice en écrivant 4 nombres dans un input
 	 * @param stringMatrix
 	 */
-	convertStringToMatrix(stringMatrix: string) {
-		return stringMatrix.replace(',', ' ').replace('  ', ' ').slice(' ');
+	convertStringToMatrix(stringMatrix: string): number[] {
+		return stringMatrix
+			.replace(',', ' ')
+			.replace('  ', ' ')
+			.split(' ')
+			.map((elem) => parseInt(elem));
 	}
 
 	/**
@@ -281,8 +285,8 @@ export class CipheringComponent implements OnInit {
 	}
 
 	getEntropy(s) {
-		let sum = 0,
-			len = s.length;
+		let sum = 0;
+		const len = s.length;
 		this.process(s, (k, f) => {
 			const p = f / len;
 			sum -= (p * Math.log(p)) / Math.log(2);