Anyone ever try encrypting a database ID (IE, a sequential int,) and use that as a public key? IE, take a 32 or 64 bit int that's the primary key, encrypt it,

Anyone ever try encrypting a database ID (IE, a sequential int,) and use that as a public key? IE, take a 32 or 64 bit int that's the primary key, encrypt it, and then use that as the public ID in a web application, URL, API, ect.