PGP Cryptographic functions

KRa

M

H

ER

| |

Z

Z-1

M

ERKRa[H(M)]

KUa

DR

Compare

H

Ks

M

EI

| |

Z

Z-1

M’

ERKUb[Ks]

DR

ER

KUb

KRb

DI

M

KRa

M

H

ER

| |

Z

Ks

EI

| |

ER

KUb

Z-1

M’

DR

KRb

DI

ERKUb[Ks]

M

ERKRa[H(M)]

KUa

DR

Compare

H

(1) Authentication only

(2) Confidentiality only

(3) Confidentiality and authentication

Source A

Destination B

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