Article · Wikipedia archive · Last revised Jun 15, 2026

Crypton (framework)

Crypton is a JavaScript library that allows one to write web applications where the server knows nothing of the contents a user is storing. This is done by use of cryptography, though the developer of the application does not need any cryptographic knowledge. It is designed to encrypt data inside a JavaScript context.

Last revised
Jun 15, 2026
Read time
≈ 1 min
Length
204 w
Citations
7
Source
Crypton
DevelopersDavid Dahl, Cam Pedersen
Initial releaseMarch 1, 2013 (2013-03-01)
Stable release
0.0.41 / January 7, 2015 (2015-01-07)2
Written inJavaScript
Operating systemCross-platform
TypeJavaScript library
LicenseAGPL, GPLv33
Websitecrypton.io
Repository

Crypton is a JavaScript library that allows one to write web applications where the server knows nothing of the contents a user is storing. This is done by use of cryptography, though the developer of the application does not need any cryptographic knowledge.4 It is designed to encrypt data inside a JavaScript context (either a browser extension, mobile application, or WebKit-based desktop application).5

Crypton was created by SpiderOak, also known for their encrypted backup product,6 who were looking for a way for data to be securely encrypted without the need for users to download a separate program.7

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