Encrypt and Sign with Two Keys

About this app

Alice, Bob and Eve with their key rings: padlocks for the public keys (everybody has all of them), keys for the private ones (only with their owner). Bob chooses what to encrypt DIES_IST_EIN_GEHEIMTEXT with, the digit card travels over the line, Eve tries every padlock. With Bob's private key Eve reads along – that is a signature, not a secret. In signed mode Alice signs an order via SHA-256, Bob checks it, Eve changes 500 to 5000 or guesses. Plus RSA with 3713 = 47 · 79 and factoring.

Subject: Cryptography

More from Cryptography

• The Nonce Lottery
• Hashing & collisions
• Pseudorandomness — how a computer rolls dice
• SHA-256 in slow motion (8-bit model)
• Cracking a Substitution Cipher

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