Google Keep Encryptor is a Chrome add-on that allows you to keep your sensitive information secure on Google Keep. With this tool, you can encrypt your text as ciphertext using the Stanford Javascript Crypto Library (SJCL).

SJCL is a highly secure library that utilizes industry-standard encryption algorithms such as AES at 128, 192, or 256 bits. It also incorporates the SHA256 hash function, HMAC authentication code, PBKDF2 password strengthener, and CCM and OCB authenticated-encryption modes. Additionally, SJCL implements sensible default parameters to strengthen passwords and protect against rainbow tables. It also ensures message authenticity to prevent unauthorized modifications.

It is important to note that if you forget your password, you will lose access to all the information stored in the encrypted notes. To mitigate this risk, the add-on recommends using password hints as labels or adding them to the note titles.

Please note that the Chrome mobile app does not currently support extensions. To decrypt your notes on Android and iOS devices, you will need to install the Tampermonkey script and access the Google Keep website through mobile browsers. Detailed instructions can be found on the project's GitHub page.

Overall, Google Keep Encryptor provides a convenient way to protect your sensitive information on Google Keep, ensuring that only you and trusted individuals can access it.