Unable to decode encrypted data – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to decrypt data that has been encrypted. This could be due to an incorrect or missing decryption key, or the data may have been corrupted during transmission. To resolve this issue, you can try re-entering the decryption key, ensuring it is correct. If the problem persists, you may need to retransmit the data, ensuring it is properly encrypted before transmission. If the data is stored, you may need to check the storage medium for errors.

This guide will help you check for common problems that cause the log ” unable to decode encrypted data ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “unable to decode encrypted data” class name is CryptoService.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 String encrypted = new String(chars; ENCRYPTED_TEXT_PREFIX.length(); chars.length - ENCRYPTED_TEXT_PREFIX.length());
 byte[] bytes;
 try {
 bytes = Base64.getDecoder().decode(encrypted);
 } catch (IllegalArgumentException e) {
 throw new ElasticsearchException("unable to decode encrypted data"; e);
 }  byte[] decrypted = decryptInternal(bytes; encryptionKey);
 return CharArrays.utf8BytesToChars(decrypted);


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