/usr/share/ca-certificates/igtf-classic/HellasGrid-CA-2006.crt is in igtf-policy-classic 1.59-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | -----BEGIN CERTIFICATE-----
MIIEhDCCA2ygAwIBAgIBATANBgkqhkiG9w0BAQUFADBoMQswCQYDVQQGEwJHUjET
MBEGA1UEChMKSGVsbGFzR3JpZDEiMCAGA1UECxMZQ2VydGlmaWNhdGlvbiBBdXRo
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ntpMyYxnRb0=
-----END CERTIFICATE-----
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