Cryptographic Hash Functions and Message Authentication Codes

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Cryptographic Hash Functionsand Message
Authentication Codes

• Reading Section 3.4 (up to 3.4.4) of Delfs
  Knebl

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m1 m2 m3
mk
r r r r
n n n
n
h(m)

f
f
f
f
IV
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m m1 m2 m3
mk (padded)
r r r r
n n n
n
h(m)

f
f
f
f
IV
m m1 m2 m3
mk (padded)
r r r r
n n n
n

h(m)h(m)
f
f
f
f
IV
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Message Authentication Code
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m1 m2 m3
mk
r r r r
h
n n n
n
h(m)

f
f
f
f
IV0
m1 m2 m3
mk
r r r r
hs
n n n
n
h(m)

f
f
f
f
s
k m1 m2
mk

h(k m)
f
f
f
f
IV0
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m m1 m2 m3
ms
X hk(m)

h(m)
f
f
k X
f
f
IV
ms1
f
hk(m) hk(mms1)
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