Abbreviation/Symbol	Explanation
CDM	Commitment Distribution Message
$d$	Disclosure time delay
DoS	Denial of Service attack
$F_0, F_1, and F_{01}$	Pseudo-random functions
$K_{i,n}$	The last $nth$ element of the low-level keychain in the $ith$ time interval of Multilevel-µTESLA
$K_{i+1}$	the high-level key in the $\left(i+1\right)$ time interval
$K^1{}_{i+2,0},K^2{}_{i+2,0}$	The commitment keys of the first and the second low-level keychains in the Hybrid TLI-µTESLA protocol
$L$	Length of High-level keychian
$MA{C}_{K_i}$	MAC value generated using $K_i$
$n$	Length of low-level keychains in the Multi-level µTESLA protocol
$S_1$ and $S_2$	Different Salt Values