Personal photo as private key? | Bitcointalksearch.org

cbhelp

newbie

Activity: 56

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Quote from: Dabs on September 20, 2013, 09:28:38 AM

Use parity on your photo or file. Or 7zip / RAR it with recovery 10% record.

It's a lot easier to just generate a random private key using bitaddress or vanitygen and just save that in a text file. Then you zip or rar it and copy it to several places like in a floppy, usb flash drive, SD card and printed on paper, stored in an envelope, locked in your safe or vault.

If you really want to use a photo, take a picture of the sky, or someone said take a picture of complete darkness (cover the lens) while setting the ISO to maximum, to get noise from the CCD or sensor. Export the RAW file or the highest quality jpeg, depending on your camera model.

Best idea itt

Dabs

legendary

Activity: 3416

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The Concierge of Crypto

Use parity on your photo or file. Or 7zip / RAR it with recovery 10% record.

It's a lot easier to just generate a random private key using bitaddress or vanitygen and just save that in a text file. Then you zip or rar it and copy it to several places like in a floppy, usb flash drive, SD card and printed on paper, stored in an envelope, locked in your safe or vault.

If you really want to use a photo, take a picture of the sky, or someone said take a picture of complete darkness (cover the lens) while setting the ISO to maximum, to get noise from the CCD or sensor. Export the RAW file or the highest quality jpeg, depending on your camera model.

doof

hero member

Activity: 765

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Quote from: brotz on September 19, 2013, 05:18:48 AM

No Problem.

1. SHA256 hash your photo --> 27d45bd2b3cc80481629522c9de1409121f75e08c3ad65bce1eb88a7a54cd705

2. bitaddress.org --> Wallet details --> enter sha256 hash --> Private key: 5J7pyQRYWxAhYg4tC1BMVDhT15GFxcRYahz2m71DAG1UR11tit8

address: 1PQa3MbPhPezjz8SkY4TdMxAupkUX2s215

Like

kjj

legendary

Activity: 1302

Merit: 1025

Quote from: cp1 on September 19, 2013, 10:58:46 PM

You can hash anything, a photo is just another stream of bits. It would be like keeping your private key in an unencrypted ascii file, it's just more obscured.

It doesn't have to be unencrypted. You could use HMAC-SHA1 on the {image file,password} pair.

cp1

hero member

Activity: 616

Merit: 500

Stop using branwallets

You can hash anything, a photo is just another stream of bits. It would be like keeping your private key in an unencrypted ascii file, it's just more obscured.

jl2012

legendary

Activity: 1792

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Quote from: DannyHamilton on September 19, 2013, 05:53:23 PM

Quote from: jl2012 on September 19, 2013, 01:01:43 AM

Any file, like photo, music, video, could be the seed. However, you will lose the private key even with 1 bit of data loss.

Which is also true of storing any private key electronically (such as in your wallet/client) as well.

Yes. But since a private key takes only 256bit, while a photo may take several Mbits, a private key has lower chance of getting corrupted.

DannyHamilton

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Activity: 3416

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Quote from: jl2012 on September 19, 2013, 01:01:43 AM

Any file, like photo, music, video, could be the seed. However, you will lose the private key even with 1 bit of data loss.

Which is also true of storing any private key electronically (such as in your wallet/client) as well.

brotz

newbie

Activity: 12

Merit: 0

No Problem.

1. SHA256 hash your photo --> 27d45bd2b3cc80481629522c9de1409121f75e08c3ad65bce1eb88a7a54cd705

2. bitaddress.org --> Wallet details --> enter sha256 hash --> Private key: 5J7pyQRYWxAhYg4tC1BMVDhT15GFxcRYahz2m71DAG1UR11tit8

address: 1PQa3MbPhPezjz8SkY4TdMxAupkUX2s215

dserrano5

legendary

Activity: 1974

Merit: 1029

Or you can do it the other way around and hide the private key inside the picture using steganography.

jl2012

legendary

Activity: 1792

Merit: 1087

Any file, like photo, music, video, could be the seed. However, you will lose the private key even with 1 bit of data loss.

the joint

legendary

Activity: 1834

Merit: 1020

Hm...Biocryptography?

Public key + fingerprint/private key = send transaction? All someone has to do is cut off your fingers...

doof

hero member

Activity: 765

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Quote from: Anon136 on September 19, 2013, 12:35:26 AM

Quote from: doof on September 19, 2013, 12:33:31 AM

Quote from: msc on September 19, 2013, 12:18:48 AM

You'd need very advanced photo recognition, and it could only be used to verify your identity, not to generate a key from scratch, because no two photos of you would be exactly the same on a byte level. A fingerprint scanner would be easier.

That's my point. Wouldn't be image recognition, the software would iterate through the pixels to pull out specific values as keys.

Ill knock up some pseudo code to explain.

it could work well in conjunction with a smaller password that you memorized. the picture would add security that a smaller password alone couldnt offer and the password would prevent people from simply testing all of your pictures to see if any was a private key. and of course there are advantages to not having to remember such a long password.

Yes exactly.

doof

hero member

Activity: 765

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Quote from: kjj on September 19, 2013, 12:12:39 AM

And the bot to download, hash, addressify and check every image on the internet launches in 3...2...

Or you could choose 2 photos. Overlay one on the other. every image on the net * ever image on the net = big number

Anon136

legendary

Activity: 1722

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Quote from: doof on September 19, 2013, 12:33:31 AM

Quote from: msc on September 19, 2013, 12:18:48 AM

You'd need very advanced photo recognition, and it could only be used to verify your identity, not to generate a key from scratch, because no two photos of you would be exactly the same on a byte level. A fingerprint scanner would be easier.

That's my point. Wouldn't be image recognition, the software would iterate through the pixels to pull out specific values as keys.

Ill knock up some pseudo code to explain.

it could work well in conjunction with a smaller password that you memorized. the picture would add security that a smaller password alone couldnt offer and the password would prevent people from simply testing all of your pictures to see if any was a private key. and of course there are advantages to not having to remember such a long password.

doof

hero member

Activity: 765

Merit: 503

Quote from: msc on September 19, 2013, 12:18:48 AM

You'd need very advanced photo recognition, and it could only be used to verify your identity, not to generate a key from scratch, because no two photos of you would be exactly the same on a byte level. A fingerprint scanner would be easier.

That's my point. Wouldn't be image recognition, the software would iterate through the pixels to pull out specific values as keys.

Ill knock up some pseudo code to explain.

niko

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Activity: 756

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There is more to Bitcoin than bitcoins.

Quote from: doof on September 19, 2013, 12:03:25 AM

Quote from: SPC_Bitcoin on September 18, 2013, 11:52:49 PM

I would not. Nobody's getting my biometrics willingly.

I mean, it could be a snap of your dog or what ever. The idea is that no one will have that exact photo but you. Easy to remember.

Impossible to remember in your brain. You can store it in a non-volatile memory, but then why not just keep it simple and generate a random number and use it as private key and store it in a nonvolatile memory... yes... now, that's a thought! You might even encrypt it before storing it, and remember the passphrase!
Also, what kjj said.

msc

sr. member

Activity: 282

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You'd need very advanced photo recognition, and it could only be used to verify your identity, not to generate a key from scratch, because no two photos of you would be exactly the same on a byte level. A fingerprint scanner would be easier.

kjj

legendary

Activity: 1302

Merit: 1025

And the bot to download, hash, addressify and check every image on the internet launches in 3...2...

doof

hero member

Activity: 765

Merit: 503

Quote from: SPC_Bitcoin on September 18, 2013, 11:52:49 PM

I would not. Nobody's getting my biometrics willingly.

I mean, it could be a snap of your dog or what ever. The idea is that no one will have that exact photo but you. Easy to remember.

SPC_Bitcoin

member

Activity: 112

Merit: 10

Coffee makes it all better!

I would not. Nobody's getting my biometrics willingly.

Topic: Personal photo as private key? (Read 2393 times)