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When A Session Is Resumed, Which Of The Following Cryptographic Secrets Need To B

Question:


When a session is resumed, which of the following cryptographic secrets need to be recalculated?

(i) Pre-Master secret

(ii) Master secret

(iii) Authentication keys

(iv) Encryp1ion keys

(v) IVs

Answer:


1) Pre-master secret and
2) Master Secret

  If an end-user reconnects to a server withing a short time frame, In the client hello, the client identifies itself with the  session-id previously issued to it by the server, and by returning this session-id in the server hello, the server implicitly agrees to use an abbreviated handshake. The master secret from the original connection is cached by both sides. The abbreviated handshake skips the need for the server to decrypt the client key exchange message to obtain the pre-master secret.

Incase the duration is long and client is trying to connect after a long gap ,the information on server might have been cached than Pre-master and master secret needs to be recalculated

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QUESTION 6 (a) The bar shown in Figure Q2(a) is subjected to tensile load of 150 Kn. If the stress in the middle portions is limited to 160 N/mm², determine the diameter of the middle portion. Find also the length of the middle portion if the total elongation of the bar is to be 0.25 mm. E E = 2.0 + 105N/mm². (12 marks) 150 KN 10 cm DIA 10 cm DIA 150 KN 45 cm Figure Q6(a) (b) A brass bar, having cross-section area of 900 mm², is subjected to axial forces as shown in Figure Q2(b), in which AB = 0.6 m, BC = 0.8 m, and CD = 1.0 m. Find the total elongation of the bar. E = 1.0 + 105N/mm2 . (8 marks) Page 4 of 5 B D 40 KN 70 KN 20 KN 10 KN Figure Q6(b) (TOTAL = 20 MARKS)

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