Amazon Simple Storage Service
Developer Guide (API Version 2006-03-01)

Appendix B: Authenticating Requests (AWS Signature Version 2)

Important

This section describes how to authenticate requests using AWS Signature Version 2. Signature Version 2 is being deprecated, and the final support for Signature Version 2 will end on June 24, 2019. After June 24, 2019, Amazon S3 will only accept API requests that are signed using Signature Version 4. Signature Version 4 is supported in all AWS Regions, and it is the only version that is supported for new Regions. For more information, see Authenticating Requests (AWS Signature Version 4) in the Amazon Simple Storage Service API Reference.