← All challenges
RSA·easy·15 pts
The Fastest Cipher
An engineer wanted RSA encryption without the performance cost. They found a way.
"RSA is too slow for our use case," the commit message says, "so I set e = 1 — same security, way faster." The pull request was approved.
Here's the "ciphertext" they're using in production.
Ciphertext (decimal integer)
54346890045854400693635193847915839177343981221943352407185784970053957584700833987772292323202591869
Hints
Checked entirely in your browser — nothing you submit here leaves your device.
Background on this technique
Up next
Too Close for Comfort →A flawed key generator picked two primes that are suspiciously close together. This is scriptable in a few lines.