Ransomware is a type of malware that attacks by encrypting the victim$$s hard$-$drive and demands extortion money to reveal the encryption key. Linux.Encoder$\mathrm{.}1$ is a ransomware that affects linux$-$based computers. Such ransomware can impact IoT devices such as connected automobiles and surgical robots and other safety$-$critical systems.

$1-$ Linux.Encoder$\mathrm{.}1$ needs a random number generator to generate good quality encryption keys for the files it encryts. What design requirements should the attacker consider when choosing an appropriate random number generator.

$2-$ Key generation in Linux.Encoder$\mathrm{.}1$ is carried out by generating a $256-$bit random num$-$

ber used as the AES encryption key, via calls to the rand function, which depends on the

system time to key the random number generator. Once the key is generated it is imme$-$

diately used to encrypt files on the victim$$s computer. Describe a defence technique to

recover the encrypted files $($without paying the attacker$)$ in the given context