PGP Format

key ID of recipient’s

public key (KUb)

session key(Ks)

Timestamp

key ID of sender’s

public key (KUa)

leading two octets

of message digest

Message digest

Filename

Timestamp

Data

session key

component

signature

message

Content

Operation

ERKUb

ERKUa

ZIP

EIKs

R64

Notations :

KUb = public key of user B

KRa = private key of user A

Ks = session key

ER = public-key encryption , using the RSA algorithm

EI = conventional encryption , using IDEA

ZIP = compression using ZIP algorithm

R64 = conversion to radix 64 ASCII printable format

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