2. - конфиденциальность
- подлинность
- неотчуждаемость
2

3. S
Alice
S, O
P = encrypt(O,S)
Bob
P
S,P
O = decrypt(P,S)
3

4. key
PRNG
plaintext
ciphertext
4

5. A5/1,A5/2
RC4
Salsa20
SEAL
…
5

6. main key
key1
PRNG
key2
PRNG
key3
PRNG
6

7. DES
3DES
AES
Twofish
…
7

8. Alice
A,A’,B’,O
P = encrypt(O,B’)
Bob
P
B,B’,A’,P
O = decrypt(P,B)
8

9. RSA
Cramer-Shoup
ECC
…
9

10. Alice
Bob
secret:
public:
open
10

11. Alice
Bob
apq
p,q
b
A=q^a mod p
A
bqp
apqA
S = B^a mod p
B
B=q^b mod p
S = A^b mod p
11

12. S
S’
MD5
RIPEMD
SHA1
…
12

13. Client
Server
ClientHello
ServerHello
Certificate
ServerHelloDone
ChangeCipherSpec
Finished
ChangeCipherSpec
Finished
13