Add mutual signatures

README.md

@@ -23,4 +23,13 @@ An S/MIME certificate has both a serial number (arbitrarily assigned by the issu
 
 ```bash
 gpg --show-keys --with-fingerprint fs-coli@cl.uni-heidelberg.de.pgp.pub.asc 
-```
\ No newline at end of file
+```
+
+## Mutual signatures
+
+You trust one key (S/MIME or OpenPGP), but not the other? For this case, we have mutually signed each key with the other one. The directory `Signatures` contains the following two files:
+
+* The S/MIME key signed with the OpenPGP key: [`Signatures/fs-coli@cl.uni-heidelberg.de.smime.pub.pem.sig`](Signatures/fs-coli@cl.uni-heidelberg.de.smime.pub.pem.sig)
+* The OpenPGP key signed with the S/MIME key: [`Signatures/fs-coli@cl.uni-heidelberg.de.pgp.pub.asc.sig`](Signatures/fs-coli@cl.uni-heidelberg.de.pgp.pub.asc.sig)
+
+By verifying the signature made with the key you already trust, you can verify that you can also trust the other key.

Signatures/fs-coli@cl.uni-heidelberg.de.pgp.pub.asc.sig

+MIME-Version: 1.0
+Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg="sha-256"; boundary="----7114FE60DBBFA0477D3F7E749D204BAF"
+
+This is an S/MIME signed message
+
+------7114FE60DBBFA0477D3F7E749D204BAF
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=9b2a
+-----END PGP PUBLIC KEY BLOCK-----
+
+------7114FE60DBBFA0477D3F7E749D204BAF
+Content-Type: application/x-pkcs7-signature; name="smime.p7s"
+Content-Transfer-Encoding: base64
+Content-Disposition: attachment; filename="smime.p7s"
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+
+------7114FE60DBBFA0477D3F7E749D204BAF--
+

Signatures/fs-coli@cl.uni-heidelberg.de.smime.pub.pem.sig

+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+Issuer ...: /CN=GEANT Personal CA 4/O=GEANT Vereniging/C=NL
+Serial ...: 076407AE88FD1AD97435B13A03EB04B0
+Subject ..: /O=Universitaet Heidelberg/ST=Baden-Wuerttemberg/C=DE/EMail=fs-coli@cl.uni-heidelberg.de/2.5.4.97=GOVDE+BW
+    aka ..: fs-coli@cl.uni-heidelberg.de
+Keygrip ..: 8CC6C7ED16AF341184BA3B87DC74062A924E1E20
+
+- -----BEGIN CERTIFICATE-----
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+- -----END CERTIFICATE-----
+-----BEGIN PGP SIGNATURE-----
+
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+-----END PGP SIGNATURE-----