play a large part in the process of constructing numerous symmetric cryptographic plans whose core security is determined by the ability of the underlying block ciphers
to fight the existing cryptanalytic technologies.
The microcontroller features AES 128/256, SHA 256, block ciphers
for code protection, key wrap, and hash message authentication code (HMAC) encryption to provide stronger IP protection and better defense against malware and misuse.
Unlike block ciphers
stream ciphers are less secured.
HIGHT is a lightweight block cipher
that has attracted a lot of attention because it is constructed by only ARX operations (modular addition, bitwise rotation, bitwise shift, and XOR), which exhibits high performance in terms of hardware compared to other block ciphers
Heys, "Analysis of the statistical cipher feedback mode of block ciphers
," IEEE Transactions on Computers, vol.
For this reason, existing block ciphers
use a SPN (substitution and permutation network) architecture such as AES , which requires a considerable amount of memory to save S-boxes and the round keys and operations.
1- Symmetric (Secret-key) cryptosystems  where only one key is used for both encryption and decryption operations, and it is of two types: Block ciphers
and stream ciphers.
Khan, "A new chaotic substitution box design for block ciphers
," in Proceedings of the 1st International Conference on Signal Processing and Integrated Networks, SPIN 2014, pp.
have to be confined to less GEs in order to fit in lightweight applications.
Security of Block Ciphers
: From Algorithm Design to Hardware Implementation
According to the MalwareHunterTeam, once installed, attackers use Rijndael block ciphers
to encrypt website files and demand Bitcoin payment ranging from $140 to $415 for decryption.
One of the best-known early block ciphers
is the Playfair system .