Decryption error bad signature¶

The following error appears while accessing an encrypted file:

"Bad Signature" from apps/encryption/lib/Crypto/Crypt.php:489. It should be from the checkSignature method.

This happen during file access, so it can be seen in different occasions.

1. In the nextcloud.log if a user is not able to access one if his file.
2. In the terminal during a file transfer with occ files:transfer-ownership.

Root cause analysis¶