The Window.crypto read-only property returns the Crypto object associated to the global object. This object allows web pages access to certain cryptographic related services. Syntax var cryptoObj = window.crypto || window.msCrypto; // for IE 11 Specifications Specification Status Comment Web Cryptography APIThe definition of 'Window.crypto' in that specification. Candidate Recommendation Initial definition Browser compatibility Desktop Mobile Feature Chrome Firefox (Gecko) Internet Explorer / Edge Chrome Opera Vivaldi Safari Basic support 44 (Yes) (Yes) 6 -ms 19 (Yes) Feature Chrome for Android Firefox Gecko Mobile Firefox OS Internet Explorer / Edge Opera for Mobile Safari Mobile Basic support (Yes) (Yes) 2 (Yes) 10 (Yes) 37 (Yes) (Yes) See also The Window global object