It's used only as a dev dependency in 8 crates.

Depender (with downloads and own rev deps) rand_dev version
650 1 generic-ec-curves dev ^0.1
600 1 stark-curve dev ^0.1
600 6 generic-ec dev ^0.1
550 3 generic-ec-zkp dev ^0.1
460 1 paillier-zk dev ^0.1.0
340 1 fast-paillier dev ^0.1
200 cggmp21 dev ^0.1
130 rand_hash dev ^0.1