  Fairly recently, a new encryption scheme for embedded systems based on
continuous third-order hyperbolic sine chaotic system was proposed by Z. Lin et
al. The cryptosystem's main objective is to provide a faster algorithm with
lowest computational time in order to be qualified for use in embedded systems
especially on a program of UAV (unmanned aerial vehicle). In this paper, we
scrutinize the design architecture of this recently proposed scheme against
conventional attacks e.g., chosen plaintext attack, differential attack, known
plaintext attack. We prove in this paper that, negatively, the studied system
is vulnerable. For differential attack, only two chosen plain images are
required to recover the full equivalent key. Moreover, only one 3x400 size
image is sufficient to break the cryptosystem under chosen plaintext attack
considering stability of sort algorithm. Therefore, the proposed scheme is not
recommended for security purposes.
