Sure, if you truncate a full‑length hash to 32 bits you’re giving up to 2^32 pre‑image resistance and a trivial collision probability. The only way to keep any bite of “security” is to make that 32‑bit chunk look random to an attacker by mixing in a secret key—basically a keyed hash or HMAC that outputs 32 bits. Even then, you’re bounded by the 32‑bit limit: it’s only good against brute‑force or targeted collision attacks up to that size. So unless you can afford a longer output, the pattern is simple: truncate, key‑mix, and accept the 2^32 ceiling.