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

Appendix B: Authenticating Requests (AWS Signature Version 2)

Note

This topic explains authenticating requests using Signature Version 2. Amazon S3 now supports the latest Signature Version 4, which is supported in all regions; it is the only version supported for new AWS regions. For more information, go to Authenticating Requests (AWS Signature Version 4) in the Amazon Simple Storage Service API Reference.