The design of tech intended, deliberately or by accident, to be obscure. Theoretically, anything, even macroscale dumbtech, can be cryptotech. The term however is more often applied to more dramatic high ultratech, transapientech or godtech creations. And while many cryptotechnologists tend to be higher toposophic minds whose motives and logic are often incomprehensible to lower beings, it is also possible for a dedicated and highly augmented ordinary sapient to design simpler forms of cryptotech; perhaps as a hobby, a joke, a unique craft, or a form of memegineering.
Cryptotech - Text by M. Alan Kazlev Technology about which there is debate whether it really even exists. Cryptotech may be obscure, very rare, and/or high toposophic tech, or transapient tech and above that for whatever reason doesn't fit into current lower toposophic understanding. The study of cryptotech is called cryptotechology, the design and construction of (authentic) cryptotech is cryptotechnology.
Cryptotechology - Text by M. Alan Kazlev The study of hidden, obscure, very rare, and/or often high toposophic tech. Some Cryptotechnology is actually nothing but rumor or memetic ploy (this is sometimes known as rumorware), but others are genuine devices, sometimes rare and one-off, sometimes dangerous, sometimes just inscrutable to lower toposophics. Because of the difficulty of procuring cryptotech, cryptotechologists themselves disagree over what is authentic and what is mere folklore.