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I'm trying to securely validate the hash of a downloaded ubuntu-11.04-alternate-amd64.iso but it seems I just can't find any.

I found this site:
but there are only MD5SUMs on it.

About MD5's security:

Where are the SHA256 hashes of Ubuntu images? is not a solution, because it's not using valid HTTPS.

Verifying the SHA256SUMS with GPG isn't the solution either, because not everyone has the public key, so we have to import it with:

gpg --keyserver hkp:// --recv-keys 0xFBB75451

and I think using this method could be compromised (when importing the keys).

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Let's go back to Q+A business. This is valid question and not a dupe (keep in mind, all close votes automatically expire after two days, so the current three shouldn't hurt). – htorque May 28 '11 at 16:42
Actually, that page is not community editable. – psusi May 29 '11 at 3:11
@psusi Thanks, corrected. – htorque May 30 '11 at 8:41
up vote 6 down vote accepted

Currently only MD5 hashes are securely available. If you believe it is necessary to provide SHA256 hashes as well, please file a bug against the Ubuntu website.

Your report will be significantly more well received if you refrain from shouting profanities at those from whom you are seeking help.

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Please use the GPG web-of-trust to verify key validity after importing the key.

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Ubuntu help: Installation/MinimalCD, section 64-bit PC (amd64, x86_64)

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This page does not provide SHA256 hashes, does not describe the normal Ubuntu releases, and is not secure because it is publicly editable. – ændrük May 29 '11 at 21:05
thx 4 pointing that one out :\ – LanceBaynes May 30 '11 at 3:21

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