Physical decryption card

thingiverse

I am sorry, my English is poor. Please use a translation tool for details. This is an encrypted device. ## Usage Scenarios If you have doubts about the security of electronic devices or plan to send confidential information through insecure devices or share secrets with your loved ones or want to save extremely important passwords on paper but are worried that plain text will be visible to others or, for example, communicate some information on public platforms and want a few specified people to read the information. ## Principle The entire system has 2 keys, public key (public key, sent along with the message) and private key (private key, delivered by phone or face-to-face secure method). Both keys are numbers from 1-9. An encryption card (the printed body of the card) has 19x26 positions randomly punched now only one type will be released later to facilitate setting of hole positions. ### Generating Encrypted Text If the private key is 4 and the text is "hello,jim,my password is admin_888," enter the private key and text on the encrypted text generator web page (later if time allows a js version will be developed for local generation without network) to generate a 19x26 letter matrix, then screenshot it together with the generated random public key (if 2) send or save to recipient. Recipient receives it first resets (public key, private key, and hole positions on the board aligned), slides the private key to 4 then slides the public key to 2 at this time public key's arrow points to the row that is the start of encrypted text read sequentially is original text.