Git was using SHA1 as a cryptographically secure identifier right from the very first month of its existence. https://github.com/git/git/commit/65f0d0ee4627dd0f

Git was using SHA1 as a cryptographically secure identifier right from the very first month of its existence. https://github.com/git/git/commit/65f0d0ee4627dd0f0468ceded38677076d78feb5 https://github.com/git/git/commit/65f0d0ee4627dd0f0468ceded3...