Briefly explain the reasons behind the following statements:

a$)$ RSA and AES encryptions are both used to perform online transactions securely$.$

b$)$ Although JSON Web Tokens $($JWTs$)$ are not encrypted, their integrity and

authenticity are guaranteed.

c$)$ Encrypting a file using $256-$bit RSA is not as secure as encrypting it using $256-$bit

AES.

d$)$ Hacking and cloning the Mifare Classic Contactless RFID cards was possible via

reverse engineering.

e$)$Bcrypt$$ could offer higher level of protection than $$SHA$-256$ for hashing

passwords.

f$)$ Digital certificates are used in the process of establishing a secure connection between

a browser and a web server.