Support intro
Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 13.0.2
Operating system and version (eg, Ubuntu 17.04): Raspbian 8 (jessie)
Apache or nginx version (eg, Apache 2.4.25): nginx/1.6.2
PHP version (eg, 7.1): 5.6.30
The issue you are facing: In my logfile I will be spamed with fatal errors. It is telling me bad signature.
Is this the first time you’ve seen this error? (Y/N): Y
The output of your Nextcloud log in Admin > Logging:
OCP\Encryption\Exceptions\GenericEncryptionException: Bad Signature
/var/www/nextcloud/apps/encryption/lib/Crypto/Crypt.php - line 465: OCA\Encryption\Crypto\Crypt->checkSignature('fSbZhYc9aT2ijwj...', ' \xAF8\xB0\x9D\x90\xC5\xB1\xC2\xEA\x1F\x82\xF5\x95/...', '5ea40bdb199fbf1...')
/var/www/nextcloud/apps/encryption/lib/Crypto/Encryption.php - line 380: OCA\Encryption\Crypto\Crypt->symmetricDecryptFileContent('fSbZhYc9aT2ijwj...', ' \xAF8\xB0\x9D\x90\xC5\xB1\xC2\xEA\x1F\x82\xF5\x95/...', 'AES-256-CTR', 41, 0)
/var/www/nextcloud/lib/private/Files/Stream/Encryption.php - line 464: OCA\Encryption\Crypto\Encryption->decrypt(*** sensitive parameters replaced ***)
/var/www/nextcloud/lib/private/Files/Stream/Encryption.php - line 295: OC\Files\Stream\Encryption->readCache()
[internal function] OC\Files\Stream\Encryption->stream_read(8192)
/var/www/nextcloud/3rdparty/icewind/streams/src/Wrapper.php - line 83: fread(Resource id #40, 8192)
/var/www/nextcloud/3rdparty/icewind/streams/src/CallbackWrapper.php - line 91: Icewind\Streams\Wrapper->stream_read(8192)
[internal function] Icewind\Streams\CallbackWrapper->stream_read(8192)
/var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php - line 84: fread(Resource id #43, 8192)
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 498: Sabre\HTTP\Sapi sendResponse(Object(Sabre\HTTP\Response))
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/nextcloud/apps/dav/lib/Server.php - line 283: Sabre\DAV\Server->exec()
/var/www/nextcloud/apps/dav/appinfo/v2/remote.php - line 35: OCA\DAV\Server->exec()
/var/www/nextcloud/remote.php - line 164: require_once('/var/www/nextcl...')
{main}
What can I do to avoid this error? And how can I get rid of it?
Kind regards
//nephilim