foreach (_class('encryption')->_avail_ciphers as $cipher) {
            $encrypted = _class('encryption')->_safe_encrypt_with_base64(self::$to_encode, self::$secret, $cipher);
            $this->assertRegexp('/^[a-z0-9\=+\*\|]+$/i', $encrypted);
            $this->assertNotEquals($prev_encrypted, $encrypted);
            $prev_encrypted = $encrypted;