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scottbb ♦
scottbb ♦
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You shallshould ask this question on Security.SE.

To avoid corruption you shallshould make Backupbackups.

See, compact disc,Writable digital optical media such as CD-R and DVD would-R could be corrupted even by sun lightsunlight. To avoid this you might use something like double backup strategy. However, nowadays, we are havinghave such beautiful methodonline methods to backup photophotos, like instagram,Instagram or any other serviceonline services. For example, behind google-disk,Google Drive there are large amount of data-centers centers. Every one of your photophotos will be stored on the Google-File-System inside this Data-Centers File System (GoogleFS or GFS) on servers hosted in these data centers. This file-systemfilesystem was designed by Google to protect users from losing data. Your photophotos will be saved in THREEthree exemplars in three different geographic locations, physically on the Earth. Toto protect against data loss because of local disasters from lightning, tsunami, earthquake, etc...

Try to use different at once,multiple online services simultaneously (such as megaupload, dropbox, wuala, 4shared, etc..).

Thereafter, if you would like to be calm,for the greatest peace-of-mind that allnone of your photos was not modified/corruptedwere modified or corrupted, you would takeuse Checksumchecksums to verify your data integrity.

The rightestbest way is to use cryptography for such task. And when you will taking checksum, useUse the latest stable hash-function functions, such as sha256SHA-256 or sha512SHA-512. SeeOlder algortihms, md5sum was crackedsuch as MD5, nowadays evildoer mightare now considered insecure. A modern attacker could make forgery of your data with the same md5sum.

When you are done, you will have sucha distributed backup-system system which wouldwill not be easily broken, even by highest attacker, such as governments of countries or evil corporations suchthe most sophisticated and dedicated attackers (such as Umbrella Incnation state -backed attacks).

  • Two DVD copy with identical datas inside:

    Two DVD copy with identical datas inside:

         1. Photo1.jpg
     2. Photo2.jpg
     3. Photo3.jpg
   ...
   999. Photo999.jpg
  1000. SHA256SUM

    Where this SHA256SUM shall contain something like:

      e5347dce99eb8cf694cf708d4a17d83abb3ec378241b5878c0abdab045859b24  Photo1.jpg
  b497a12b608def869a0429d7e6bbbd112bd413256201647a5aff6773de3b7bd9  Photo2.jpg
  b15b0d99bf8135286f444fc62bcf70278a89e60650252ab2bd3b6fffd40c4255  Photo3.jpg
  ...
  209732fbdb499f0cad6fd3311b45185667bbb40e501106997d3ac2c49cb30a7e  Photo999.jpg

    The lines 209732fbdb499f0cad6fd3... are unique hashes of your photos. When one bit of your photo becomes corrupt, this hash will be changed to another, so you could test hashes against this list to be calm that your photos are keeping integrity.

  1. Photo1.jpg
  2. Photo2.jpg
  3. Photo3.jpg

...

  1. Photo999.jpg
  2. SHA256SUM

Where this SHA256SUM shall contain something like:

e5347dce99eb8cf694cf708d4a17d83abb3ec378241b5878c0abdab045859b24  Photo1.jpg
b497a12b608def869a0429d7e6bbbd112bd413256201647a5aff6773de3b7bd9  Photo2.jpg
b15b0d99bf8135286f444fc62bcf70278a89e60650252ab2bd3b6fffd40c4255  Photo3.jpg

...

209732fbdb499f0cad6fd3311b45185667bbb40e501106997d3ac2c49cb30a7e  Photo999.jpg

This lines 209732fbdb499f0cad6fd3... - are unique hashes of your photos. When one bit of your photo will corrupt, this hash will be changed to another, so you could test hashes against this list to be calm that your photos are keeping integrity.

  • Secondly, all of this photos and this SHA256SUM-hashes file are uploaded to e.g. dropbox and somewhere else.

    Secondly, all of this photos and this SHA256SUM-hashes file are uploaded to e.g. dropbox and somewhere else.

The scheme might be evolved to something more robust off-courseof course. Your imagination -is your trump card.

You shall ask this question on Security.SE.

To avoid corruption you shall make Backup.

See, compact disc, such as DVD would be corrupted even by sun light. To avoid this you might use something like double backup. However, nowadays, we are having such beautiful method to backup photo, like instagram, or any other service. For example, behind google-disk, there are large amount of data-centers. Every your photo will be stored on the Google-File-System inside this Data-Centers. This file-system designed by Google to protect users from losing data. Your photo will be saved in THREE exemplars in three different locations, physically on the Earth. To protect data from lightning, tsunami, earthquake etc...

Try to use different at once, megaupload, dropbox, wuala, 4shared, etc...

Thereafter, if you would like to be calm, that all of your photos was not modified/corrupted you would take Checksum.

The rightest way is to use cryptography for such task. And when you will taking checksum, use latest stable hash-function, such as sha256 or sha512. See, md5sum was cracked, nowadays evildoer might make forgery of your data with the same md5sum.

When you are done, you will have such distributed backup-system which would not be broken even by highest attacker, such as governments of countries or evil corporations such as Umbrella Inc.

  • Two DVD copy with identical datas inside:
  1. Photo1.jpg
  2. Photo2.jpg
  3. Photo3.jpg

...

  1. Photo999.jpg
  2. SHA256SUM

Where this SHA256SUM shall contain something like:

e5347dce99eb8cf694cf708d4a17d83abb3ec378241b5878c0abdab045859b24  Photo1.jpg
b497a12b608def869a0429d7e6bbbd112bd413256201647a5aff6773de3b7bd9  Photo2.jpg
b15b0d99bf8135286f444fc62bcf70278a89e60650252ab2bd3b6fffd40c4255  Photo3.jpg

...

209732fbdb499f0cad6fd3311b45185667bbb40e501106997d3ac2c49cb30a7e  Photo999.jpg

This lines 209732fbdb499f0cad6fd3... - are unique hashes of your photos. When one bit of your photo will corrupt, this hash will be changed to another, so you could test hashes against this list to be calm that your photos are keeping integrity.

  • Secondly, all of this photos and this SHA256SUM-hashes file are uploaded to e.g. dropbox and somewhere else.

The scheme might be evolved to something more robust off-course. Your imagination - your trump card.

You should ask this question on Security.SE.

To avoid corruption you should make backups.

Writable digital optical media such as CD-R and DVD-R could be corrupted even by sunlight. To avoid this you might use something like double backup strategy. However, nowadays, we have such beautiful online methods to backup photos, like Instagram or other online services. For example, behind Google Drive there are large amount of data centers. Every one of your photos will be stored on the Google File System (GoogleFS or GFS) on servers hosted in these data centers. This filesystem was designed by Google to protect users from losing data. Your photos will be saved in three exemplars in three different geographic locations, to protect against data loss because of local disasters from lightning, tsunami, earthquake, etc.

Try to use multiple online services simultaneously (such as megaupload, dropbox, wuala, 4shared, etc.).

Thereafter, for the greatest peace-of-mind that none of your photos were modified or corrupted, you would use checksums to verify your data integrity.

The best way is to use cryptography for such task. Use the latest stable hash functions, such as SHA-256 or SHA-512. Older algortihms, such as MD5, are now considered insecure. A modern attacker could make forgery of your data with the same md5sum.

When you are done, you will have a distributed backup system which will not be easily broken, even by the most sophisticated and dedicated attackers (such as nation state -backed attacks).

  • Two DVD copy with identical datas inside:

         1. Photo1.jpg
     2. Photo2.jpg
     3. Photo3.jpg
   ...
   999. Photo999.jpg
  1000. SHA256SUM

    Where this SHA256SUM shall contain something like:

      e5347dce99eb8cf694cf708d4a17d83abb3ec378241b5878c0abdab045859b24  Photo1.jpg
  b497a12b608def869a0429d7e6bbbd112bd413256201647a5aff6773de3b7bd9  Photo2.jpg
  b15b0d99bf8135286f444fc62bcf70278a89e60650252ab2bd3b6fffd40c4255  Photo3.jpg
  ...
  209732fbdb499f0cad6fd3311b45185667bbb40e501106997d3ac2c49cb30a7e  Photo999.jpg

    The lines 209732fbdb499f0cad6fd3... are unique hashes of your photos. When one bit of your photo becomes corrupt, this hash will be changed to another, so you could test hashes against this list to be calm that your photos are keeping integrity.

  • Secondly, all of this photos and this SHA256SUM-hashes file are uploaded to e.g. dropbox and somewhere else.

The scheme might be evolved to something more robust of course. Your imagination is your trump card.

Source Link
backupemall
backupemall
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Why does this happen and, most importantly, how to avoid this?

You shall ask this question on Security.SE.

To avoid corruption you shall make Backup.

In information technology, a backup, or the process of backing up, refers to the copying and archiving of computer data so it may be used to restore the original after a data loss event. The verb form is to back up in two words, whereas the noun is backup.

See, compact disc, such as DVD would be corrupted even by sun light. To avoid this you might use something like double backup. However, nowadays, we are having such beautiful method to backup photo, like instagram, or any other service. For example, behind google-disk, there are large amount of data-centers. Every your photo will be stored on the Google-File-System inside this Data-Centers. This file-system designed by Google to protect users from losing data. Your photo will be saved in THREE exemplars in three different locations, physically on the Earth. To protect data from lightning, tsunami, earthquake etc...

Try to use different at once, megaupload, dropbox, wuala, 4shared, etc...

Thereafter, if you would like to be calm, that all of your photos was not modified/corrupted you would take Checksum.

A checksum is a small-size datum from a block of digital data for the purpose of detecting errors which may have been introduced during its transmission or storage.

The rightest way is to use cryptography for such task. And when you will taking checksum, use latest stable hash-function, such as sha256 or sha512. See, md5sum was cracked, nowadays evildoer might make forgery of your data with the same md5sum.

When you are done, you will have such distributed backup-system which would not be broken even by highest attacker, such as governments of countries or evil corporations such as Umbrella Inc.

  • Two DVD copy with identical datas inside:
  1. Photo1.jpg
  2. Photo2.jpg
  3. Photo3.jpg

...

  1. Photo999.jpg
  2. SHA256SUM

Where this SHA256SUM shall contain something like:

e5347dce99eb8cf694cf708d4a17d83abb3ec378241b5878c0abdab045859b24  Photo1.jpg
b497a12b608def869a0429d7e6bbbd112bd413256201647a5aff6773de3b7bd9  Photo2.jpg
b15b0d99bf8135286f444fc62bcf70278a89e60650252ab2bd3b6fffd40c4255  Photo3.jpg

...

209732fbdb499f0cad6fd3311b45185667bbb40e501106997d3ac2c49cb30a7e  Photo999.jpg

This lines 209732fbdb499f0cad6fd3... - are unique hashes of your photos. When one bit of your photo will corrupt, this hash will be changed to another, so you could test hashes against this list to be calm that your photos are keeping integrity.

  • Secondly, all of this photos and this SHA256SUM-hashes file are uploaded to e.g. dropbox and somewhere else.

Now, you have 5 copies of your photos. 2 off-line, 2 on-line, 1 on your current hard drive.

The scheme might be evolved to something more robust off-course. Your imagination - your trump card.