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Where can I download PGP key 0x50FA58BC used to sign "thunderbird-38.4.0.en-US.mac.checksums"?

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JohnFolsum
JohnFolsum
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The key 0x50FA58BC used to verify the checksum file "thunderbird-38.4.0.en-US.mac.checksums" downloaded from https://ftp.mozilla.org/pub/thunderbird/nightly/latest-comm-esr38/ is not available from the Mozilla or MIT PGP key servers; neither Google nor several other search engines locate it, though this is the ID of the public key used to sign this general release file.

Here is the full output from my tests:

tests-...$ openssl dgst -sha512 thunderbird-38.4.0.en-US.mac.dmg SHA512(thunderbird-38.4.0.en-US.mac.dmg)= ec11b2428fad89db096a2efc326a27e8ca2b4bbb7cf5530ed191e6451fbad772137b744eaeb878b3e6761b8e321191a9fd00e89fc1875855dd5bbbf5d4cc86ac tests-...$ gpg --verify thunderbird-38.4.0.en-US.mac.checksums.asc thunderbird-38.4.0.en-US.mac.checksums gpg: Signature made Tue Dec 15 06:53:37 2015 CST using DSA key ID 50FA58BC gpg: Can't check signature: No public key tests-...$

The key 0x50FA58BC used to verify the checksum file "thunderbird-38.4.0.en-US.mac.checksums" downloaded from https://ftp.mozilla.org/pub/thunderbird/nightly/latest-comm-esr38/ is not available from the Mozilla or MIT PGP key servers; neither Google nor several other search engines locate it, though this is the ID of the public key used to sign this general release file. Here is the full output from my tests: tests-...$ openssl dgst -sha512 thunderbird-38.4.0.en-US.mac.dmg SHA512(thunderbird-38.4.0.en-US.mac.dmg)= ec11b2428fad89db096a2efc326a27e8ca2b4bbb7cf5530ed191e6451fbad772137b744eaeb878b3e6761b8e321191a9fd00e89fc1875855dd5bbbf5d4cc86ac tests-...$ gpg --verify thunderbird-38.4.0.en-US.mac.checksums.asc thunderbird-38.4.0.en-US.mac.checksums gpg: Signature made Tue Dec 15 06:53:37 2015 CST using DSA key ID 50FA58BC gpg: Can't check signature: No public key tests-...$

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christ1
christ1
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There is a KEY file available at https://ftp.mozilla.org/pub/thunderbird/releases/38.0.1/ This key is: Primary User ID Mozilla Software Releases <releases@mozilla.org> Key ID 0x3A06537A Signing subkey 0x15A0A4BC

Checksums are available at https://ftp.mozilla.org/pub/thunderbird/releases/38.4.0/

When trying to verify the sig file SHA512SUMS.asc it fails, because it has been signed with a different key.

> gpg --verify SHA512SUMS.asc SHA512SUMS gpg: Signature made Fri 20 Nov 2015 07:47:50 PM CET using RSA key ID 5E9905DB gpg: Can't check signature: No public key

I have no idea where to get key 0x5E9905DB from.

Update: The key is available at https://gpg.mozilla.org/pks/lookup?search=0x5E9905DB&op=get

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