Problem whit reading characters

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I second @DiCaver’s remark. The presence of the string “AES/CBC/PKCS7Padding” is a clear indication of an encrypted file.

Now you have to investigate a bit more to discover or remember what was recently installed that could encrypt your files. It could be, for example (non-exhaustive list):

  1. An Obsidian plugin to encrypt the vault (are all your notes unreadable like this?)
  2. Some option in your filesystem to encrypt folders (are the files outside the vault also unreadable?)
  3. Ransomware (a virus encrypted your files, and you are asked to pay to recover them)

Hope it’s just a plugin and you can recover everything easily.