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00:10
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00:36
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Flashfire |
Does anyone know of anyone to search via SHA256 hashes on the archive? I want to upload some files but don’t know how to check if they have already been upload as some have some really whacky file names |
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00:37
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JAA |
Since it's not possible to search by filename, I doubt searching by hashes is possible. IA also doesn't provide SHA256 hashes in its files lists, only MD5 and SHA1. |
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00:39
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vitzli |
couple years ago there was an archive census, when item names, file names and their checksums were extracted, but it was only done for md5 and sha1 checkums |
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00:39
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Flashfire |
ok fair enough SHA1 but MD5 is deprecated as fuck. I know sha1 has had proven hash collisions as well but it’s still broadly used |
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00:40
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JAA |
vitzli: https://archiveteam.org/index.php?title=Audit2014 ? That would only be AT, not all of IA, right? |
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00:40
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Flashfire |
I feel like the amount of items in the archive you would have run into many md5 has collisions |
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00:40
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JAA |
Flashfire: MD5 and SHA1 are fine for corruption detection. Hell, even CRC32 would be fine for single-bit corruption detection. They shouldn't be used for cryptographic purposes though. |
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00:41
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vitzli |
https://archiveteam.org/index.php?title=Internet_Archive_Census |
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00:41
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Flashfire |
Alright then. |
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00:41
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JAA |
Ah, cool. |
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00:43
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Flashfire |
https://shattered.io/ |
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00:43
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JAA |
Yeah, I know. |
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00:43
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Flashfire |
I remember when this happened |
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00:43
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JAA |
Corruption detection is very different from authenticity verification though. |
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00:44
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Flashfire |
Do you have any reading for me to look at |
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00:46
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JAA |
https://crypto.stackexchange.com/questions/60142/md5-hash-functions-to-prove-integrity-of-a-download and other threads on Crypto SE. |
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02:12
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02:26
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hook54321 |
iirc I used MD5 checksums to let people "verify" some stuff that I have. I probably shouldn't have used, but it took ridiculously long. |
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02:26
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hook54321 |
*used it |
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02:26
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02:36
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JAA |
hook54321: That would require a pre-image attack (preparing a file that has the same hash as a given file that is not under the control of the attacker), which to my knowledge isn't practical at the moment. So no, fine for that. |
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02:38
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JAA |
The thing that's broken about MD5 is collision resistance, i.e. it's easy to prepare two files that have the same hash. That means it's useless for many cryptographic applications and generally shows that the algorithm has issues, but it doesn't mean it can't be used for anything. |
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02:39
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JAA |
I wouldn't use it for that (better safe than sorry), but at the moment, it shouldn't be a problem. |
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02:39
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hook54321 |
Well, it was log of a discord channel. I made every line an MD5 hash. I'll link to it on once I get back to my laptop. |
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02:39
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hook54321 |
*a log |
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02:41
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JAA |
Ah, that. Yeah, you mentioned it before. Right, since the data being hashed is very short, that's probably bruteforceable to at least some degree. |
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02:42
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JAA |
Forging a message that gives the same hash should still be pretty hard. |
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02:43
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02:43
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JAA |
Except for messages controlled by an attacker. So if someone is in the channel, they might be able to write something to the channel and then claim they wrote something different which produces the same hash. |
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02:44
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JAA |
Anyway, I need to go to bed. |
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02:53
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hook54321 |
gn |
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02:57
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hook54321 |
https://archive.org/download/FRCDiscord-gencon-2017-hashes/hashes.txt |
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psi |
I should ask fus ell for his Grafana setup sometime |
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15:18
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psi |
and/or find a better way than https://github.com/ThePsionic/list-warrior-jobs to display the status of my jobs (because the list has become quite long) |
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