Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh...
-
Upload
ender-sali -
Category
Documents
-
view
212 -
download
0
Transcript of Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh...
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
1/20
8
8.3.4
. 320-325 19, ggiannop (at)
sch.gr
http://diktya-epal-g.ggia.info/Creative Commons License 3.0 Share-Alike
http://diktya-epal-g.ggia.info/http://diktya-epal-g.ggia.info/ -
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
2/20
.
.
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
3/20
(Encryption):
( plaintext) () . , . .
(Decryption): . () ( )
.
el.wikipedia.org/wiki/
http://el.wikipedia.org/wiki/%CE%9A%CF%81%CF%85%CF%80%CF%84%CE%BF%CE%B3%CF%81%CE%B1%CF%86%CE%AF%CE%B1http://el.wikipedia.org/wiki/%CE%9A%CF%81%CF%85%CF%80%CF%84%CE%BF%CE%B3%CF%81%CE%B1%CF%86%CE%AF%CE%B1http://el.wikipedia.org/wiki/%CE%9A%CF%81%CF%85%CF%80%CF%84%CE%BF%CE%B3%CF%81%CE%B1%CF%86%CE%AF%CE%B1 -
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
4/20
.
. . Caesar Cipher
( ) .
: 3
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
5/20
CaesarCipher
24 ( ).
, . () =>
. ( )
(;).
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
6/20
CSS (Content Scramble System) DVD, A5/1 , BD+ Blue Ray (.. Anydvd Slysoft).
( ) !
http://en.wikipedia.org/wiki/Content_Scramble_S
http://en.wikipedia.org/wiki/A5/1http://en.wikipedia.org/wiki/BD%2B
http://commons.wikimedia.org/wiki/File:BluRayDiscBack.png
http://commons.wikimedia.org/wiki/File:BluRayDiscBack.pnghttp://en.wikipedia.org/wiki/Content_Scramble_Systemhttp://en.wikipedia.org/wiki/A5/1http://en.wikipedia.org/wiki/BD%2Bhttp://commons.wikimedia.org/wiki/File:BluRayDiscBack.pnghttp://commons.wikimedia.org/wiki/File:BluRayDiscBack.pnghttp://en.wikipedia.org/wiki/BD%2Bhttp://en.wikipedia.org/wiki/A5/1http://en.wikipedia.org/wiki/Content_Scramble_System -
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
7/20
DES (Data Encryption Standard): .3DES (Triple DES): DES.
IDEA (International Data EncryptionAlgorithm): .
64bits. 64bits 64bits.
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
8/20
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
9/20
. 2
.
. .
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
10/20
Alice Bob
. . ( keyservers). ( )
.
AliceBob
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
11/20
(Key): , ( bits) . .
(Public Key): , , .
, . () . , .
en.wikipedia.org/wiki/File:RSA_SecurID_SID800.jpg
http://en.wikipedia.org/wiki/File:RSA_SecurID_SID800.jpghttp://en.wikipedia.org/wiki/File:RSA_SecurID_SID800.jpg -
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
12/20
. 323 , .
keyservers
. . (fingerprint), .
(.. ) !
.
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
13/20
Alice Bob. Bob , Bob . ( Bob) ( ,
Bob Bob).
Alice Bob
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
14/20
O Bob Alice Alice ; Alice . Bob Alice Bob
Alice.
Alice Bob
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
15/20
. ,
(smart cards).
( ).
RSA (Rivest, Shamir, Adelman) ELGamal:
en.wikipedia.org/wiki/File:RSA_SecurID_SID800.jpg http://en.wikipedia.org/wiki/File:Public-key-crypt
http://en.wikipedia.org/wiki/File:RSA_SecurID_SID800.jpghttp://en.wikipedia.org/wiki/File:Public-key-crypto-1.svghttp://en.wikipedia.org/wiki/File:RSA_SecurID_SID800.jpghttp://en.wikipedia.org/wiki/File:Public-key-crypto-1.svghttp://en.wikipedia.org/wiki/File:Public-key-crypto-1.svghttp://en.wikipedia.org/wiki/File:RSA_SecurID_SID800.jpg -
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
16/20
.
(Digital Signature): bit ( ) ( ) .
() (HashFunction): ( )
. , ,
(digests). commons.wikimedia.org/wiki/File:Hash_functio
http://commons.wikimedia.org/wiki/File:Hash_function_el.svghttp://commons.wikimedia.org/wiki/File:Hash_function_el.svg -
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
17/20
( ).
. : Message
Digest 4 (MD4), Message Digest 5 (MD5),Secure Hash Algorithm (SHA).
:
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
18/20
(.. Bob Alice)
( , .. PGP, Digital Signature Standard) (.. MD5). . . Alice Bob
. (digest). , . Bob . O Bob
Alice. , . , , Alice.
.
:
-
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
19/20
http://commons.wikimedia.org/wiki/File:Digital_Signature_diag
.
http://commons.wikimedia.org/wiki/File:Digital_Signature_diagram_el.svghttp://commons.wikimedia.org/wiki/File:Digital_Signature_diagram_el.svg -
8/7/2019 Kefalaio 8 Diaxeirish Kai Asfaleia Diktyou 8 3 4 Texnikes Asfaleias Symmetrikh Asymmetrikh Kryptografish Pshfiakes Ypografes
20/20
http://diktia.dyndns.org/ - ' . .
http://el.wikipedia.org/wiki/%CE%A8%CE%B7%CF%86%CE%B9%CE%B1%CE%BA%CE%AE_%CF%85%CF%80%CE%BF%CE%B3%CF%81%CE%B el. wikipedia.
http://diktia.dyndns.org/http://el.wikipedia.org/wiki/%CE%A8%CE%B7%CF%86%CE%B9%CE%B1%CE%BA%CE%AE_%CF%85%CF%80%CE%BF%CE%B3%CF%81%CE%B1%CF%86%CE%AEhttp://el.wikipedia.org/wiki/%CE%A8%CE%B7%CF%86%CE%B9%CE%B1%CE%BA%CE%AE_%CF%85%CF%80%CE%BF%CE%B3%CF%81%CE%B1%CF%86%CE%AEhttp://diktia.dyndns.org/