### Instruction:

Extract the cause and effect entities from the following sentence:
Sender and receiver share a secret key to generate and verify a MAC (Message Authentication Code) [72]

### Assistant:

CONDITION: share a secret key
AND: and
VARIABLE: receiver
NOT_RELEVANT: (Message Authentication Code) [72]
EFFECT_1: to generate
EFFECT_2: verify a MAC
CAUSE_1: Sender
CAUSE_2: receiver share a secret key

