← LAB 04 INFORMATIONPUBLIC CHANNEL EXPERIMENT

EXAMPLE VALUES ONLY · Browser-only · deliberately tiny numbers are not secure cryptography.

01 OBSERVE02 EXCHANGE03 LOCK04 SIGN

PUBLIC INFORMATION CAN CROSS. PRIVATE INFORMATION STAYS HOME.

ALICE

PRIVATE a = 6shared secret: —
PUBLIC / OBSERVABLE CHANNEL
p = 23 · g = 5
Waiting for public values
EVE OBSERVES EVERYTHING HERE

BOB

PRIVATE b = 15shared secret: —
THE OLD PROBLEM

Sending ORBIT-7 as a shared secret exposes it to an observer.

Try the unsafe route first.
SHOW THE TINY DH MATH

BOB'S KEY PAIR

PUBLIC KEY: protected locallyPRIVATE KEY: remains with Bob
MESSAGE→ public-key operation →CIPHERTEXT→ public channel →BOB'S PRIVATE SIDEPublish the public key to begin the conceptual flow.

TINY RSA TRANSPARENT MACHINE

MATHEMATICAL MODEL ONLY — deliberately tiny and insecure.

The teaching round trip is ready.

SIGN THE EXACT DATA

UNSEALED
A signature can bind this exact message to a corresponding private key.