Twitter has open sourced TextSecure — an Android text-messaging client the company acquired earlier last month with the purchase Whisper Systems, an outfit founded by well-known security guru Moxie Marlinspike — and in the coming months, it plans to release the rest of Whisper’s security-minded software.

On Tuesday, Twitter announced that the TextSecure code is already available on GitHib and that more is on the way. “Before we fully release Whisper Systems’ code to the public in the coming months, we need to make sure it meets legal requirements and is consumable by the open source com...