Exam AWS Certified Solutions Architect - Professional topic 1 question 18 discussion

C. HMAC-SHA1

The correct answer is C. HMAC-SHA1. AWS Auto Scaling requests are signed using HMAC-SHA1, a cryptographic hash function that creates a unique signature from the request and the user's private key. The signature is then sent to AWS along with the request. AWS uses the user's public key to verify the signature and confirm that the request was sent by an authorized user. SSL, AES-256, and X.509 are all different types of encryption technologies. SSL is used to encrypt data in transit, AES-256 is a symmetric encryption algorithm, and X.509 is a standard for public key certificates. None of these technologies are used to sign AWS Auto Scaling requests.

https://docs.aws.amazon.com/autoscaling/ec2/APIReference/CommonParameters.html X-Amz-Algorithm The hash algorithm that you used to create the request signature. Condition: Specify this parameter when you include authentication information in a query string instead of in the HTTP authorization header. Type: string Valid Values: AWS4-HMAC-SHA256 Required: Conditional

C. is right

c SHA1

C Requests are signed with an HMAC-SHA1 signature calculated from the request and the user’s private key.

D . X509