Some years back I was in a D&D campaign where doppelgangers became a major ongoing concern. It turned out that in that case doppelgangers built up their image of the person they wanted to mimic through careful observation, but thanks to the general prudishness of society doppelgangers rarely ever caught glimpses of peoples’ genitals. So we ultimately came up with the “crotch check” system. Doppelgangers usually couldn’t form plausible genitalia.
Relevant XKCD: https://xkcd.com/1121/
Does my doppelgänger go to my workplace and do my job?
If not, that’s the giveaway. If he does, I leave him to it and go read a book in the park.
Don’t let my boss know that I know this.
Congrats, your doppelganger goes to your job and gets you fired. The monkey’s paw strikes again.
In that case, that’s the giveaway
My friends would notice immediately when we started playing any fps games after work. I don’t wanna toot my own horn too much, but I am decently above average at fps games and my friends tend to like having me on their team since I am almost always top fragging.
If they aren’t weirdly good at shooters people are gonna get suspicious quick lol
I’d sign a payload using my private key that my doppelganger doesn’t have.
Same as I do now, passwords. Unless they inherited my memories, in which case who’s to say I’m not the doppelganger?
Lol, I think passwords are very trival to get.
I mean, they got the ability to look like you, you gotta assume they can get CCTV footage of you typing your passwords.
I don’t see how looking like me would help them get CCTV footage, unless it’s through some sort of supernatural means. And even if they could find footage of me entering a password, they’d be hard-pressed to extract individual keystrokes from a typical CCTV quality recording. Perhaps it’s technically possible, but it’s certainly not trivial.
Nice try, Doppelganger!
Save it for queen dopplepopolis!
I dub thee Sir Phobos, Beater of Ass.
Simple. I kill my doppelgänger, if he wins he wanted it more.
There could be only one Rusty Shackleford.
…Dwight?
Be too useless to merit a doppelganger. To paraphrase zhuangzi, few know the usefulness of uselessness.
I’m the one who knows how to use Lemmy.
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Well, easy, I’m the one without the moustache.
I would be signing all my communications cryptographically and sharing a key in person so people can validate whether a message not delivered face to face is really from me.
Cryptography is the only correct answer
They can’t type anything on my phone because I use Thumb-Key.
If they only mimic me and have some knowledge based on what is on my phone/online, they probably don’t speak the same foreign languages as I on the same level. So I could authenticate myself by proving that I speak those languages.
