Saturday Mac riddles 169

Here are this weekend’s riddles to entertain you through family time, shopping and recreation.

1: Challenging response of a lunge and command to prove identity.

2: Sensational contact in the unconscious from a fingerprint.

3: For gaining private admission with a public key.

To help you cross-check your solutions, there’s a common factor between them.

I’ll post my solutions first thing on Monday morning.

Please don’t post your solutions as comments here: it spoils it for others.