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I want to encrypt files, wich can be decrypted and encrypted by multiple different keys. Is there any algorithm which can accomplish this?

Example (Each user has a different key):

  • User 1 encrypts a file with his key
  • User 2 decrypts the file, adds information and encrypts it with his key
  • User 3 decrypts the file with his key
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It seems that the similar problem was discussed here. The general approach was to encrypt the file with a random key and then encrypt copies of this key with users' keys.

However, if you'd like really different keys, check @ddddavidee's answer.

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