# Man Tries to Explain RSA Cryptography to His GF, Ends Up Getting Dumped Via Encrypted Text
Look, I know we’ve all been there. You’re sitting on the couch, your partner asks a simple question like “What did you do at work today?” and suddenly you’re three PowerPoint slides deep into a lecture about prime factorization and modular arithmetic. It’s a tale as old as time. But one Redditor on r/relationship_advice just took this sacred tradition and turned it into a dumpster fire so epic, it’s now being studied by cryptographers and therapists alike.
Let’s set the scene. Our hero, u/CryptoDaddy69420 (yes, that’s his actual throwaway, because of course it is), is a software engineer who “really likes” public-key cryptography. His girlfriend of eight months, let’s call her “Alice” because he probably did, asked him a innocent question: “How do those little lock icons on websites actually work?”
Brother. **Brother.** This was not a question. This was a trap. This was the universe handing him a loaded gun and asking if he wanted to play Russian roulette with his relationship.
According to his post, which has since been deleted but preserved by the digital archeologists over at r/SubredditDrama, he responded by saying, “Babe, that’s a really good question. Let me explain RSA.”
He didn’t just explain RSA. He **lived** RSA. He became RSA. He allegedly pulled out a whiteboard he keeps in the trunk of his car “for emergencies.” He drew a diagram of Bob sending a message to Alice. He explained the totient function. He spent 45 minutes on why 65537 is the “golden ratio of encryption exponents” (it’s not, but go off king).
And here’s where it gets spicy. His girlfriend, who works in marketing and apparently has the patience of a saint, asked him to “just give her the short version.” So what does our boy do? Does he say “it’s math stuff that keeps your credit card safe”? No. He says, **“The short version is that breaking RSA is computationally infeasible because factoring large semiprime numbers is hard. It’s like trying to find two specific LEGO bricks in a giant pile of LEGOs, but the pile is the size of Texas and the LEGOs are atoms.”**
That’s a direct quote. A man used the analogy “LEGOs are atoms” to explain cryptography to a woman who just wanted to know why her Venmo didn’t get hacked.
Now, let’s talk about the fallout. Because this is where it becomes a Certified Reddit Moment™.
She didn’t respond. She just got up, walked to the bedroom, and closed the door. He, in his infinite wisdom, thought she was “processing the information.” He sat there for another 20 minutes writing down the RSA algorithm on a napkin “in case she wanted to practice later.”
At 11:47 PM, his phone buzzed. It was a text from her.
**“I’m breaking up with you. This message is encrypted with RSA-4096. Have fun factoring the private key.”**
Narrator voice: *He did not have fun.*
The comments on his post were, predictably, a masterpiece of internet cruelty. Let me give you the highlights:
- “YTA. Not for explaining RSA, but for keeping a whiteboard in your car. That’s not a personality, that’s a condition.”
- “INFO: Did you explain that RSA is actually vulnerable to quantum computing? Because if you didn’t, she dodged a bullet.”
- “This is the most software engineer breakup since that guy who got dumped for calling his girlfriend’s emotions ‘unhandled exceptions.’”
- “I’m a cryptographer. I’ve literally designed algorithms that secure nuclear launch codes. And even I think you need to touch grass.”
But here’s the real twist, the moment that sent this post into the stratosphere of r/all. Another Redditor, claiming to be his ex-girlfriend’s friend, commented with a screenshot. The screenshot was of her new Tinder bio. It read:
**“Looking for a guy who can keep a secret. Not one who explains how to keep a secret for three hours. Must not own a whiteboard. Bonus points if you don’t know what RSA stands for.”**
The post was nuked within an hour, but not before screenshots hit Twitter, where it was ratioed into oblivion. The discourse was brutal. Some people argued he was just “passionate.” Others pointed out that emotional intelligence is a thing. One brave soul asked, “Why didn’t he just say ‘it’s math magic’ and then kiss her?”
And that, my friends, is the real question. Why didn’t he just say “it’s math magic”? Because he’s a man. A man with a whiteboard in his trunk. A man who thinks “computationally infeasible” is pillow talk.
Let’s break down the AITA verdict here, because you know the internet already has.
On one hand, he was sharing knowledge. He was excited. He wanted her to understand a complex topic that he loves. That’s cute, right? Wrong. That’s the kind of cute that leads to a cat lady future. There’s a time and place for RSA, and that time is never, and that place is definitely not your girlfriend’s living room after she asked a simple question.
On the other hand, she handled it like an absolute queen. That breakup text? Iconic. Legendary. She didn’t scream, she didn’t cry, she just nerd-sniped him with his own damn algorithm. She turned his passion into his punishment. That’s not just a breakup, that’s a **performance art piece**.
The internet has ruled: He’s the asshole, but she’s the hero.
Now, the inevitable update came three days later. u/CryptoDaddy69420 posted a follow-up. He said he “
Final Thoughts
Having covered the RSA Conference for years, I’ve seen it oscillate between a genuine crucible of ideas and a bloated trade show, but this year’s “country” metaphor struck me as both apt and unsettling. The event has become a sovereign nation of cybersecurity, complete with its own economy of venture capital, hierarchies of celebrity analysts, and border disputes over turf like zero-trust vs. SASE. My takeaway? As long as the industry remains more focused on branding its own fiefdoms than on the grim reality of nation-state attackers, we’re just building a shiny palace on a fault line.