18

PGPPGPPGPPGP

PGP1991Philip ZimmermannPGP

1991PGPPGP

1996

1997PGP 5.0i

RSAIDEA

(Private Key)(Public Key)

(Encrypt)(Decrypt)(Sign)(Verify)

USB

S/MIME

(WINDOWSMACUnixMS-DOS)

(OutLookApple mailThunderbird)

IDEA + RSA !!()(DESAESRSAElGamal)(X.509 vs. PGP)

PKZIP

PKZIP => IDEA+RSAIDEA+RSA => PKZIP

128-bit Hash(MD5SHA-1MD2)

IDEA + RSA

PKZIP

Hash => (Hash+)IDEA+RSA => PKZIPPKZIP => IDEA+RSA(Hash+) => Hash

ID1RSA()2RSA()3RSA()16ElGamal()17DSS1819ECDSA20ElGamal()21Diffie-Hellman100-110

ID01IDEA2DES3CAST-1284Blowfish5SAFER-SK1286DES/SK7AES-1288AES-1929AES-256100-110

ID1MD52SHA-13RIPE-MD/1604SHA5MD26TIGER/1927HAVAL100-110

ID01ZIP2ZLIP100-110

PGP

X.509()

PGP

PGP

PGP http://www.pgp.com

PGP Desktop Trial Software (Client Only)http://www.pgp.com/downloads/desktoptrial/desktoptrial2.html

=> =>

http://www.google.com.tw/

http://www.pgp.com/http://oasis.csie.ntu.edu.tw/2009_spring_ss/slides/45http://www.asiapeak.com/pgp-howto.php