When you use the search encrypt browser extension, your data will be encrypted for the duration of your session and stored on end-to-end encrypted servers. All files are encrypted locally before being uploaded to Google, and decrypt keys are specific to you. Files are encrypted with a key that we never have access to (so nobody at Google can read what you upload) and each file is given its own unique encryption key. Our search code determines which decryption key of yours to use for a particular query based on filename extension rules that encode file type.