https://www.vice.com/en_us/article/jgxdwy/twitter-encrypted-direct-messages-dms-ron-wyden

After hackers managed to take over a wave of high profile accounts on Twitter by leveraging access to an internal tool, Senator Ron Wyden is highlighting that the social network has not implemented end-to-encryption for direct messages, even though the company previously explored the idea.

"In September of 2018, shortly before he testified before the Senate Intelligence Committee, I met privately with Twitter's CEO Jack Dorsey. During that conversation, Mr. Dorsey told me the company was working on end-to-end encrypted direct messages. It has been nearly two years since our meeting, and Twitter DMs are still not encrypted, leaving them vulnerable to employees who abuse their internal access to the company's systems, and hackers who gain unauthorized access," Wyden said in a statement.