Lightweight Cryptographic Algorithms for Guessing Attack Protection in Complex Internet of Things Applications

Table 1

Comparative analysis between block cipher and stream cipher.

Parameter	Block cipher	Stream cipher
Block size	Large (128 bit)	Small (1 bit)
Key size	Fixed	Variable
Number of rounds	Large	—
Resource consumption	Large	Small
Robustness against error	Small	High
Application	To encrypt the bulk message	To encrypt the small message
Zero padding	Required	Not required
Examples	DES, AES, Blowfish	RC4, Grain, Trivium