Table 4.

Comparison of WIEs (SWIE is the fastest one)

Scheme	Feature	Scalability	Pattern	Ciphertext size
WIE [128], 2011	Wildcarded	$\times$	Not-hidden	Variable
GWIE [133], 2012	Generalized	$✓$	Hidden	Variable
SWIE [130], 2018	Scalable	$✓$	Hidden	Constant
DWIE [134], 2019	Downgradable	$\times$	Not-hidden	Constant
SWIE [135], 2020	Scalable	$✓$	Hidden	Constant
WIE [136], 2020	Wildcarded	$\times$	Hidden	Constant