- Torsten Timm, Andreas Schinner:
Review of The linguistics of the Voynich manuscript by Claire Bowern and Luke Lindemann. Cryptologia 45(5): 434-438 (2021) - John A. Tokar:
NSA honors two Cryptologia board members. Cryptologia 45(2): 97-101 (2021) - Viktor Wase:
Benford's law in the Beale ciphers. Cryptologia 45(3): 282-286 (2021) - Frode Weierud
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In memoriam: Thomas Ralph Erskine CB (1933 - 2021). Cryptologia 45(4): 289-308 (2021) - 18th cryptologic history symposium. Cryptologia 45(3): 193 (2021)