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Authentication token format updates
March 29, 2021: We’ve updated this Changelog entry to reflect current prefix format
In two weeks, we will change the format of newly minted GitHub authentication tokens as part of ongoing improvements to make your software more secure. The following token types are affected:
- Personal Access Tokens
- OAuth Access Tokens
- GitHub App User-to-Server Tokens
- GitHub App Server-to-Server Tokens
- Refresh Tokens
For each of these token types we are making the following changes:
- The character set is changing from
[a-f0-9]to[A-Za-z0-9_] - The format is changing to include a prefix:
ghp_for Personal Access Tokensgho_for OAuth Access tokensghu_for GitHub App user-to-server tokensghs_for GitHub App server-to-server tokensghr_for GitHub App refresh tokens
The overall length of our tokens will remain the same for now. However, GitHub tokens will likely increase in length in future updates, so integrators should plan to support tokens up to 255 characters after June 1, 2021.
You can now attach files, including images, to markdown files while you're editing them in the web. This works just like file attachments in issues and pull requests and supports the same file types. Just drag and drag, click and select, or paste.
Note: If you add an image to a markdown file, anyone can view the anonymized image URL without authentication, even if the markdown file is in a private repository. To keep images private, serve them from a private network or server that requires authentication. For more information on anonymized URLs see "About anonymized image URLs".