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Question

In GCM, we define S as S = GHASH(A||0^v||C||0^u||[len(A)]||[len(C)]). What is v defined as?

a.

64 ceil[len (A)/128] – len (A)

b.

64 ceil[len (C)/128] – len (C)

c.

128 ceil[len (A)/128] – len (A)

d.

128 ceil[len (C)/128] – len (C)

Posted under Message Authentication Codes and Key Management Cryptography and Network Security

Answer: (c).128 ceil[len (A)/128] – len (A)

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Q. In GCM, we define S as S = GHASH(A||0^v||C||0^u||[len(A)]||[len(C)]). What is v defined as?
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