Fr Matthew Charlesworth, SJ
Fr Matthew Charlesworth, SJ
https://sj.mcharlesworth.fr/

Verify my Email Signature

If you received a signed email from matthew.charlesworth@jesuits.net and your email application says that the certificate is not trusted, that is expected until you establish trust manually.

Certificate details

Name: Fr Matthew Charlesworth, SJ
Email: matthew.charlesworth@jesuits.net
Website: https://sj.mcharlesworth.fr/

Valid from: 2026-04-08 until: 2036-04-05

SHA-256 fingerprint

16 42 F9 CD 9B B7 31 7D 95 2D 57 C9 D0 56 B5 A0 2C A5 9E A7 A7 16 40 A9 E9 48 8D F0 4C E1 8D 55

SHA-1 fingerprint

75 FD D4 7C A2 55 6D 51 01 4C D7 72 F8 A9 AC 63 CA 05 25 D4

Public certificate

Download the public certificate

Notes

Used for personal signed email.

Authority

This certificate is issued under my private email signing authority. You can review that authority here: Email Signing Authority.

Revocation

If a certificate is ever compromised or replaced, it will be listed in the certificate revocation list (CRL).

Download the current revocation list (CRL)

How to trust it

Trusting a certificate is usually a one-time manual step. Once trusted, future signed emails from me should verify normally, provided I continue using the same certificate authority and the relevant certificate remains valid.

Apple Mail on macOS

  1. Open the signed email.
  2. Click the signature or certificate icon.
  3. View the certificate details.
  4. Confirm that the email address and fingerprint match this page.
  5. Add the certificate to Keychain if prompted.
  6. In Keychain Access, locate the certificate and set it to trust for email use if needed.

iPhone or iPad Mail

  1. Open the signed message.
  2. Tap the signature indicator.
  3. View the certificate.
  4. Confirm that the email address and fingerprint match this page.
  5. Accept or trust the certificate if your device gives you that option.

Thunderbird

  1. Open the signed email.
  2. Click the signature icon.
  3. View the certificate.
  4. Confirm that the email address and fingerprint match this page.
  5. Import or trust the certificate in Thunderbird’s certificate manager if needed.

Outlook on Windows

  1. Open the signed message.
  2. Open the signature details.
  3. View the certificate.
  4. Confirm that the email address and fingerprint match this page.
  5. Install it into the appropriate certificate store, usually Trusted People, if you want future signed messages from me to verify without warnings.

A note on security

Please do not trust the certificate merely because an email asks you to do so. Always compare the certificate fingerprint in your email program with the fingerprint published on this page.

If the fingerprint does not match exactly, do not trust the certificate.

Why I use this system

I use my own certificate authority to sign email cryptographically. This allows me to rotate individual email certificates when necessary while keeping a stable chain of trust.

If you are unsure

If you are uncertain whether to trust a certificate, please contact me through a known and trusted channel before proceeding.

Contact

If you are uncertain, please contact me through a known channel before trusting the certificate.

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