Summary of PGP Services and Algorithms

PGP

IDEA

MD5

Radix-64

ZIP

message encryption

digital signature

compression

E-mail compatibility

RSA

A message is encrypted using

IDEA with a one time session

key generated by the sender.

The key is encrypted using RSA

with the recipient’s public key,

and included with the message.

A hash code of a message is created

using MD%. This message digest is

encrypted using RSA with the

sender’s private key, and included

with the message.

A message may be compressed,

for storage or transmission, using

ZIP.

To provide transparency for E-mail

applications, an encrypted message

may be converted to an ASCII string

using radix-64 conversion.

segmentation

To accommodate maximum message size

limitations, PGP performs segmentation

and reassemble.

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