And some alternate endings seen on reedit

Alternate ending 1.

After dating for a few weeks, Bob decides that they’re just not right for each other. He tries to let her down easy, but they have an incredibly ugly breakup. Alice pleads with Bob to take her back. He’s the best thing that ever happened to her.

After years of therapy, Alice is finally convinced that she’s over Bob. One morning she reads of a new cryptographic attack on Bruce Schneier’s blog. She applies it to the messages in the folder “CIPHERTEXT I HAVE YET TO CRACK”. She’s forgotten about Bob’s old message, but it’s in there, of course.

Poor Alice.

Alternate ending 2.

Alice applies a Shor’s algorithm attack using her quantum computer. The knowledge that Bob leaves the decision of who he will marry up to a cryptography test clues her in to Bob’s latent psychotic tendencies and saves her life by allowing her to sever all contact with him.