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All SAML Metadata documents published by ACOnet for the eduID.at service are signed with a 2048-bit sized private key that corresponds to the public key contained in the self-issued X.509 certificate reproduced below in Base64-encoded DER format:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

This certificate can also be securely downloaded via HTTPS from this location, e.g. via curl:

eduID.at SAML Metadata Signing Key

curl -O https://eduid.at/keys/aconet-metadata-signing.crt

The public key from that certificate is this (openssl x509 -pubkey -noout -in aconet-metadata-signing.crt):

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwSDLS25Y5spmrB8fykSq
zXbTaEssR/cD12foFIDoLwN5PUEwXWWPsl8zXyoFw2nWlrORK47Z8wjU1QlO4BcZ
Rt8ix52GJXs9Q5xgBs4zE/Xp6hgUBa0if2PxOWoA2UTqUgBj8L6joVkz5rBeiY7J
2CkfvRw+QSzkMm+YEsmAcwpyghavKfDvYSOxubuYBacqkwGa0J8AkDuiG3kfpydr
CE5R8KTt8P65Xie5+g8YCU0mql1vCzD0O48y5dK5SHD4PhkpG2BAayGiNUR7bDSk
VElb3uybwjb0BQI+q0hu4NqpeZjTY0pTnu5oZhQW49e4M+gKJEoSUceI3CSZ6nSf
HwIDAQAB
-----END PUBLIC KEY-----

The fingerprints of that certificate are:

SHA-1    EE:37:0A:C2:77:56:F8:8B:45:3A:9B:7D:F2:F0:CA:24:C2:14:33:72
SHA-256  35:56:3A:36:DA:77:A7:76:77:12:E9:E6:BC:CA:F7:02:D8:40:26:A8:AE:A7:DA:BC:5D:B9:72:EB:BE:FA:CB:4B

You can always contact ACOnet to verify the fingerprint, e.g. via telephone. To calculate the fingerprint of the downloaded certificate use the following openssl command (on MS-Windows you could use these binaries):

openssl x509 -noout -fingerprint -sha256 -in aconet-metadata-signing.crt

Optional Web of Trust check

For added assurance about the authenticity of the key reproduced and referenced above you may download an OpenPGP signature from one of the eduID.at operators.

The commands below will download the Metadata Signing Key (aconet-metadata-signing.crt), a file containing an OpenPGP-signature of it (aconet-metadata-signing.crt.asc) and then verify that the Metadata Signing Key has in fact been signed by that OpenPGP-key:

$ curl -O https://eduid.at/keys/aconet-metadata-signing.crt
$ curl -O https://eduid.at/keys/aconet-metadata-signing.crt.asc
$ gpg --verify aconet-metadata-signing.crt.asc
gpg: Signature made Mon 23 Jun 2014 15:23:35 CEST using RSA key ID F868B59A
gpg: Good signature from "Peter Schober <peter@metameta.org>"
gpg:                 aka "Peter Schober <peter.schober@univie.ac.at>"
gpg:                 aka "Peter Schober <peter@aco.net>"

How much additional trust you derive from that procedure depends solely on the trust you put into the Web of trust signatures on the OpenPGP key used to sign that file, i.e. whether you believe the people who have signed the eduID.at operator's key to be legit thereby testifying to the authenticity of the identity represented in that OpenPGP key.

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