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NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

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Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#61

Earlier quoted context omitted.

If you're talking about SED feature, no, it isn't widespread since it's regarded as an "enterprise" feature and only available in minority of drives (regardless of HDD or SSD). Client or OEM variants of same drives (otherwise identical) lack SED option most of the time and doesn't encrypt data by default.

The hardware is still there - they don't make a new asic for the consumer version

doesn't mean it's active.

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#62
post #52

Earlier quoted context omitted.

Yes, using carbon fiber was also a very bad decision; it was known for a very long time that it was only good for single-use sub, because after the first dive it was too damaged to continue. In 2014, Virgin Oceanic, which had similar plans with similar technology, closed shop because it didn't make economic sense to build a new sub for each dive. But weight is absolutely an issue; the basic and tried-and-true metal s…

>size and thickness grow exponentially It's a [reverse] pressure vessel, so it follows pressure vessel scaling. Mass scaling is linear with internal volume.

Ok yes "exponentially" was hyperbolic. Mass scales linearly with volume, but volume is proportional to the cube of the radius (not linear).

Also, in practice, small imperfections can have a disproportionate impact on the resistance of the sphere so design codes typically apply conservative reductions that can have a big impact on actual thickness requirements.

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#63
post #59

Earlier quoted context omitted.

>size and thickness grow exponentially It's a [reverse] pressure vessel, so it follows pressure vessel scaling. Mass scaling is linear with internal volume.

It’s funny how “literally” often means “figuratively” now, and “exponentially” means “polynomially”.

Yep.

https://books.google.com/ngrams/graph?content=exponentially%...

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#64
post #49

There's a fascinating and redacted interview with an "anonymous" subject about the disaster. To say the least it's an unsuccessful attempt to hide the identity of the individual: "Q. So how did you get yourself started into submersible operations? A. Well, I'm sure you're familiar with my film Titanic. When I set down the path to make that film, the first thing that I did was arrange to be introduced to the head of t…

Cameron did several TV interviews about the Titan, why would they redact his name? He didn't mince his words either; he was extremely critical of the whole thing before and after the disaster.

Maybe it is policy. If you have three experts in the field and you redact the details for two of the interviews taken, you can’t work it out that Bob was one of the two. Granted, they borked the redaction here.

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#65
post #39

Amusing that the bits the “manufacturer asked to be redacted” in the images appear to be the identifiers for common off-the-shelf electronic components, including a standard memory card. Is that really super secret IP?

It is if you are a camera manufacturer. Another example https://www.cined.com/whats-inside-a-red-mini-mag-the-contro...

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#66

I'm confused. Why are decryption keys in NVRAM? That seems to negate the purpose of at-rest encryption if you can retrieve keys from the device even after shutdown.

What would you say is the threat model that leads one to auto-encrypt sdcards?

For a machine that needs to boot unattended, what would you do with disk decryption keys?

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#67
post #4

Wow. SubC’s software engineering needs some work. They thought the camera’s file system was unencrypted, when it was encrypted. They didn’t know where the keys were to decrypt it. It turned out the key was written unencrypted to a UFS storage device. There was a file written to /mnt/nas/Stills, which indicates that the camera was to writing to a remote file system that wasn’t mounted.

They thought the camera’s file system was unencrypted, when it was encrypted. Unfortunately this situation is likely to get more common in the future as the "security" crowd keep pushing for encryption-by-default with no regard to whether the user wants or is even aware of it. Encryption is always a tradeoff; it trades the possibility of unauthorised access with the possibility of even the owner losing access permane…

This has already happened to Windows users when BitLocker disk encryption is enabled by default and they do something that causes the encryption key to be lost.

You can have the key saved in your Microsoft account.

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#68
post #62

Earlier quoted context omitted.

>size and thickness grow exponentially It's a [reverse] pressure vessel, so it follows pressure vessel scaling. Mass scaling is linear with internal volume.

Ok yes "exponentially" was hyperbolic. Mass scales linearly with volume, but volume is proportional to the cube of the radius (not linear). Also, in practice, small imperfections can have a disproportionate impact on the resistance of the sphere so design codes typically apply conservative reductions that can have a big impact on actual thickness requirements.

Did this thing meet any design codes though? I doubt it.

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#69
post #62

Earlier quoted context omitted.

Ok yes "exponentially" was hyperbolic. Mass scales linearly with volume, but volume is proportional to the cube of the radius (not linear). Also, in practice, small imperfections can have a disproportionate impact on the resistance of the sphere so design codes typically apply conservative reductions that can have a big impact on actual thickness requirements.

Did this thing meet any design codes though? I doubt it.

I read the report when it come out. From memory, no. It never had any components or certification for human pressure vessels. IIRC theres no existing regs for carbon fiber and it would have cost like $50M to do the design and test work. They did buy some things, like the viewport, from companies who do certified parts, but instead opted for the same design minus any test certs to save money. The craft was never certified or inspected by the uscg. It did have a registration for a while, but they had to play find-a-new-district-sign-off shell games for a while, then… just stopped bothering.

Re: NTSB report: Decryption of images from the Titan submersible camera [pdf] (2024)

#70
post #33

Earlier quoted context omitted.

Took me forever to find the actual quote - ChatGPT and Gemini kept trying to gaslight me that it’s not a real quote or that Willie said it to Bart until I gave the exact quote (at which point normal search engines were fine): > A certain agitator, for privacy's sake, let's call her Lisa S. No, that's too obvious, let's say L. Simpson. Lisa the Vegetarian

If you google “Lisa S L Simpson” it’s the first thing that comes up… why make it harder with AI?

>> Took me forever to find the actual quote - ChatGPT and Gemini kept trying to gaslight me that it’s not a real quote or that Willie said it to Bart until I gave the exact quote (at which point normal search engines were fine):

> If you google “Lisa S L Simpson” it’s the first thing that comes up… why make it harder with AI?

Because AI is the future! His employer is probably requiring him use it first for everything. Only when it fails (and you can tell), may other ways to solve the problem be tried.

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