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NEW QUESTION: 1
The Diffie-Hellman algorithm is used for?
A. Key exchange
B. Digital signature
C. Non-repudiation
D. Encryption
Answer: A
Explanation:
Diffie Hellman is a Key exchange algorithm, its strength its in the difficulty of computing discrete logarithms in a finite field generated by a large primary number. Although RSA and Diffie Hellman are similar in mathematical theory, their implementation is somewhat different.
This algorithm has been released to the public. It's the primary alternative to the RSA algorithm for key exchange.

NEW QUESTION: 2
Given the code fragment:
Path path1 = Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 = Paths.get("/server/exe/");
Path res1 = path1.resolve("/readme/");
System.out.println(res1);
System.out.println(res2);
What is the result?
A. /app/./sys/log
/ server/exe/readme
B. /app/log/sys
/ server/exe/readme
C. /app/sys/log
/readme/server/exe
D. /app/./sys/log
/ readme
Answer: D

NEW QUESTION: 3
A company has a web application that securely uploads pictures and videos to an Amazon S3 bucket The company requires that only authenticated users are allowed to post content The application generates a preasigned URL that is used to upload objects through a browser interface Most users are reporting slow upload times for objects larger than 100 MB.
What can a Solutions Architect do to improve the performance of these uploads while ensuring only authenticated users are allowed to post content?
A. Configure an Amazon CloudFront distribution for the destination S3 bucket Enable PUT and POST methods for the CloudFront cache behavior Update the CloudFront origin to use an origin access identity (OAI). Give the OAI user s3:PutObject permissions in the bucket policy Have the browser interface upload objects using the CloudFront distribution.
B. Enable an S3 Transfer Acceleration endpoint on the S3 bucket Use the endpoint when generating the presigned URL Have the browser interface upload the objects to the URL using the S3 multipart upload API.
C. Set up an Amazon API Gateway with a regional API endpoint that has a resource as an S3 service proxy Configure the PUT method for this resource to expose the S3 Putobject operation Secure the API Gateway using an AWS Lambda authorizer Have the browser interface use API Gateway instead of the presigned URL lo upload objects
D. Set up an Amazon API Gateway with an edge-optimized API endpoint that has a resource as an S3 service proxy Configure the PUT method for this resource to expose the S3 Putobject operation Secure the API Gateway using a COGNITO_USER_POOLS authorizer. Have the browser interface use API Gateway instead of the presigned URL to upload objects
Answer: D

NEW QUESTION: 4
Which of the following is NOT a key recovery method?
A. A message is encrypted with a session key and the session key is, in turn, encrypted with the public key of a trustee agent. The encrypted session key is sent along with the encrypted message. The trustee, when authorized, can then decrypt the message by recovering
the session key with the trustee's private key.
B. A message is encrypted with a session key and the session key is, in turn, encrypted with the private key of a trustee agent. The encrypted session key is sent along with the encrypted message. The trustee, when authorized, can then decrypt the message by
recovering the session key with the trustee's public key.
C. A message is encrypted with a session key. The session key, in turn, is broken into parts and each part is encrypted with the public key of a different trustee agent. The encrypted parts of the session key are sent along with the encrypted message. The trustees, when
authorized, can then decrypt their portion of the session key and
provide their respective parts of the session key to a central agent.
The central agent can then decrypt the message by reconstructing
the session key from the individual components.
D. A secret key or a private key is broken into a number of parts and
each part is deposited with a trustee agent. The agents can then
provide their parts of the key to a central authority, when presented
with appropriate authorization. The key can then be reconstructed
and used to decrypt messages encrypted with that key.
Answer: B
Explanation:
Encrypting parts of the session key with the private keys of the
trustee agents provides no security for the message since the
message can be decrypted by recovering the key components of
the session key using the public keys of the respective agents. These
public keys are available to anyone.
The other answers are valid means of recovering keys, since key recovery refers to permitting access to encrypted messages under predefined circumstances.
Two of these answers are also called key encapsulation since the session key is encapsulated in the public keys of the trustee agents and, therefore, can be decrypted only by these trustee agents with their private keys.