private String getCipherInitString() {
        if (algName.equals("Blowfish")) {
            return "Blowfish/CBC/PKCS5Padding";
        } else if (algName.equals("DES")) {
            return "DES/CBC/PKCS5Padding";
        } else if (algName.equals("TripleDES")) {
            return "TripleDES/CBC/PKCS5Padding";
        } else if (algName.equals("AES")) {
            return "AES/CBC/PKCS5Padding";
        } else if (algName.equals("RC4")) {
            return "RC4"; //stream chiffre
        } else {
            return algName;
        }
    }