Toy HTTPS

Server Hello Certificate

Have the toy server choose the suite and prove its certificate with tiny RSA arithmetic. This is toy arithmetic only, not deployable security.

cryptography This lesson follows a tiny HTTPS-like protocol sequence so every value can be checked by hand.

Example

Have the toy server choose the suite and prove its certificate with tiny RSA arithmetic.

highlighted = computed this step

Step 1 — Server random

Compute the highlighted cryptography value.

server_random9\begin{array}{c|c}\text{server\_random}&\hlmath{\text{9}}\end{array}

Step 2 — Selected suite

Compute the highlighted cryptography value.

selected suiteTOY_DHE_RSA_WITH_XOR8_SUM\begin{array}{c|c}\text{selected suite}&\hlmath{\text{TOY\_DHE\_RSA\_WITH\_XOR8\_SUM}}\end{array}

Step 3 — Certificate digest

Compute the highlighted cryptography value.

certificate digest8\begin{array}{c|c}\text{certificate digest}&\hlmath{\text{8}}\end{array}

Step 4 — Verify signature

Compute the highlighted cryptography value.

signature, e, n, verified(2, 3, 55, 8)\begin{array}{c|c}\text{signature, e, n, verified}&\hlmath{\text{(2, 3, 55, 8)}}\end{array}

Step 5 — Certificate verdict

Compute the highlighted cryptography value.

verified digest vs digestmatch\begin{array}{c|c}\text{verified digest vs digest}&\hlmath{\text{match}}\end{array}