private IMessage cryptanalyseCesar(IMessage crypte) {
		IMessage m=this.decrypterCaesar(crypte, "0");
		double min=Outils.comparerLong(m.getChar());
		Integer r=-1;
		for(Integer i=1;i<26;i++) {
			m=this.decrypterCaesar(crypte, i.toString());
			if(Outils.comparerLong(m.getChar())<min) {
				min=Outils.comparerLong(m.getChar());
				r=i;
			}
		}
		return this.decrypterCaesar(crypte,r.toString());
	}