[conspire] Risks ...

[Michael Paoli]

Risks ...
of an expired Risks Digest certificate:
$ TZ=GMT0 date -Iseconds
2019-03-23T22:52:20+00:00
$ curl -I https://catless.ncl.ac.uk/Risks/
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
  of Certificate Authority (CA) public keys (CA certs). If the default
  bundle file isn't adequate, you can specify an alternate file
  using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
  the bundle, the certificate verification probably failed due to a
  problem with the certificate (it might be expired, or the name might
  not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
  the -k (or --insecure) option.
$ TZ=GMT0 nmap -Pn -r -sT -p 443 --script=ssl-cert catless.ncl.ac.uk |  
fgrep -i after
| Not valid after:  2019-03-22T16:19:56
$