1

WEP

2

SECURITATE SEMANTICA INTERCEPTARE SIMPLA

SECURITATE SEMANTICA INTERCEPTARE MULTIPLA

3

DEM

SISTEME DE CRIPTARE BLOC

PRP

4

PRF

5

6

Sisteme bloc ca PRP

Cum punem PRP in practica?

RETELE DE SUBSTITUTIE-PERMUTARE

7

8

9

DES - Data Encryption Standard

10

11

12

13

AES - Advanced Encryption Standard

Securitate CPA si CCA

14

15

Coduri de autentificare a mesajelor

16

17

18

19

Scheme de criptare CCA sigure

20

CONFIDENTIALITATE SI AUTENTIFICAREA MESAJELOR

21

22

FUNCTII HASH

23

24

25

26

STOCAREA PAROLELOR

27

MD5

28

29

Keccak

HMAC

30

Atacuri de timp pentru MAC-uri

31

CRIPTOGRAFIA ASIMETRICA

32

33

PREZUMTII CRIPTOGRAFICE DIFICILE

34

35

NOTIUNI DE SECURITATE IN CRIPTOGRAFIA

ASIMETRICA

36

37

PERMUTARI CU TRAPA SECRETA

38

39

RSA

40

PKCS

41

Despre problema logaritmului discret

42

43

44

45

Sistemul de Criptare ElGamal

46

47

48

49

50

SISTEME ISTORICE DE CRIPTARE

RAIL FENCE

MONO CAESAR

POLI PLAYFARE, HILL, VIGENERE

PRINCIPIILE DE LA BAZA CRIPTOGRAFIEI MODERNE

51

SECURITATEA PERFECTA

OTP (one time pad)

CRIPTOGRAFIE COMPUTATIONALA

Securitate perfecta (Scheme informational-teoretic sigure)

vs. Criptografia computationala

Sec perf nu e practica...

52

SISTEME FLUIDE

SISTEME FLUIDE:

PRG

SECURITATE INTERCEPTARE UNICA

Demonstratie intuitiva

53

SECURITATE- INTERCETARE MULTIPLA

MOD SINCRONIZAT

MOD NESINCRONIZAT

54

Contents WEP .......................................................................................................................................1

SECURITATE SEMANTICA INTERCEPTARE SIMPLA .....................................................2

SECURITATE SEMANTICA INTERCEPTARE MULTIPLA ................................................2

DEM .......................................................................................................................................3

SISTEME DE CRIPTARE BLOC .............................................................................................3

PRP.........................................................................................................................................3

PRF .........................................................................................................................................4

Sisteme bloc ca PRP............................................................................................................6

Cum punem PRP in practica?............................................................................................6

RETELE DE SUBSTITUTIE-PERMUTARE ............................................................................6

DES - Data Encryption Standard .......................................................................................9

AES - Advanced Encryption Standard ........................................................................... 13

Securitate CPA si CCA ...................................................................................................... 13

Coduri de autentificare a mesajelor ............................................................................. 15

Scheme de criptare CCA sigure ..................................................................................... 19

CONFIDENTIALITATE SI AUTENTIFICAREA MESAJELOR ............................................. 20

FUNCTII HASH ................................................................................................................... 22

STOCAREA PAROLELOR ................................................................................................... 26

MD5 .................................................................................................................................... 27

Keccak ................................................................................................................................ 29

HMAC ................................................................................................................................. 29

Atacuri de timp pentru MAC-uri ................................................................................... 30

CRIPTOGRAFIA ASIMETRICA........................................................................................... 31

PREZUMTII CRIPTOGRAFICE DIFICILE ........................................................................... 33

PERMUTARI CU TRAPA SECRETA................................................................................... 37

RSA...................................................................................................................................... 39

PKCS.................................................................................................................................... 40

Despre problema logaritmului discret ......................................................................... 41

Sistemul de Criptare ElGamal ........................................................................................ 45

SISTEME ISTORICE DE CRIPTARE ................................................................................... 50

RAIL FENCE ........................................................................................................................ 50

MONO CAESAR.............................................................................................................. 50

POLI PLAYFARE, HILL, VIGENERE ................................................................................ 50

PRINCIPIILE DE LA BAZA CRIPTOGRAFIEI MODERNE ................................................. 50

SECURITATEA PERFECTA ................................................................................................. 51

OTP (one time pad).......................................................................................................... 51

CRIPTOGRAFIE COMPUTATIONALA .............................................................................. 51

SISTEME FLUIDE ............................................................................................................... 52

SISTEME FLUIDE: .............................................................................................................. 52

PRG ..................................................................................................................................... 52

SECURITATE INTERCEPTARE UNICA........................................................................... 52

SECURITATE- INTERCETARE MULTIPLA ........................................................................ 53

MOD SINCRONIZAT.......................................................................................................... 53

MOD NESINCRONIZAT ..................................................................................................... 53