(Requirements in communication) (efficiently) (Information Theory) (certainly) (Coding Theory) (safely) (Cryptography) I 1
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1 (Requirements in communication) (efficiently) (Information Theory) (certainly) (oding Theory) (safely) (ryptography) I 1
2 (Requirements in communication) (efficiently) (Information Theory) (certainly) (oding Theory) (safely) (ryptography) I 1
3 (obstructions for safe communication) (obstruction) (DoS ) (tapping) (tampering) (disguise) etc. I 2
4 DoS (Denial-of-service attack) A B E B E I 3
5 DoS (Denial-of-service attack) A B E B E I 3
6 DoS (Denial-of-service attack) A B E distributed denial-of-service attack (DDos) I 4
7 (tapping) A P P B E P I 5
8 (tapping) A P P B E P I 5
9 (secret communication) A B P E? P P: (plain text), : (ciphertext) P : (encryption) P : (decryption) (cryptanalysis) I 6
10 (tampering) A B P E P A (authentication), (digital signature) I 7
11 (disguise) A B E P P A (authentication), (digital signature) I 8
12 (disguise) A B E P P A (authentication), (digital signature) I 8
13 (cryptography) A B P E? P A P B P E P B I 9
14 (cryptography) A B P E? P A P B P E P B I 9
15 (cryptography) Assumption: open channels (being tapped) ( ) open cryptographic system (symmetric-key cryptography) ( ) (public-key cryptography) I 10
16 (cryptography) Assumption: open channels (being tapped) ( ) open cryptographic system (symmetric-key cryptography) ( ) (public-key cryptography) I 10
17 (cryptography) ( ) ( ) ( ) I 11
18 (symmetric-key cryptography) substitution ciphers ( ) aesar cipher linear block ciphers ( ) Vernam ciphers (one-time pad) DES (Data Encryption Standard) AES (Advances Encryption Standard) I 12
19 Ex. aesar cipher (aesar ) Key ( ) : n Z/26Z Encryption ( ) : n-shift backward Decryption ( ) : n-shift forward XYZABDEFGHIJKLMN OPQRSTUVWXYZAB : n =? :????? KHOOR I 13
20 Ex. aesar cipher (aesar ) Key ( ) : n Z/26Z Encryption ( ) : n-shift backward Decryption ( ) : n-shift forward XYZABDEFGHIJKLMN OPQRSTUVWXYZAB : n = 3 : HELLO KHOOR I 13
21 aesar (Weakness of aesar cipher) DES (Deta Encryption Standard) AES (Advanced Encryption Standard) I 14
22 aesar (Weakness of aesar cipher) DES (Deta Encryption Standard) AES (Advanced Encryption Standard) I 14
23 ( ) (preperties of symmetric-key cryptography) The encryption key and the decryption key are the same. (simple, fast) (need key-sharing) (need a different key for each pair) I 15
24 : ( ) ( ) I 16
25 : ( ) ( ) I 16
26 : ( ) ( ) I 16
27 (Public-key cryptography) ( ) ( ) The encryption key and the decryption key are different. (No need key-sharing in advance) (authentication) (signature) (non-repudiation) I 17
28 (Public-key cryptography) ( ) ( ) The encryption key and the decryption key are different. (No need key-sharing in advance) (authentication) (signature) (non-repudiation) I 17
29 (Public-key cryptography) ( ) ( ) The encryption key and the decryption key are different. (No need key-sharing in advance) (authentication) (signature) (non-repudiation) I 17
30 (Public-key cryptography) (slow) (first share a secret key under public-key cryptosystem) (then communicate with the key under secret-key cryptosystem) I 18
31 A e public: e B d P E? P secret: d I 19
32 A public: e B e d P E? P secret: d A (signature) I 20
33 (signature) A public: e d P E? secret: d B e P I 21
34 (signature) d A public: e B e P E? P secret: d E P I 22
35 (signature) M M (hash value) h(m) A S M B I 23
36 (signature) A public: e A public: e B B S d A h(m) M secret: d A e B d B ea S M h(m) secret: d B I 24
37 (preperties of public-key cryptography) (Everyone can encrypt.) (Decryption requires the secret key.) ( )?!! ( ) I 25
38 (preperties of public-key cryptography) (Everyone can encrypt.) (Decryption requires the secret key.) ( )?!! ( ) I 25
39 (preperties of public-key cryptography) (Everyone can encrypt.) (Decryption requires the secret key.) ( )?!! ( ) I 25
40 (preperties of public-key cryptography) (Everyone can encrypt.) (Decryption requires the secret key.) ( ) (use of problems hard to compute) (prime decomposition) (discrete logarithm) I 26
41 (public-key cryptosystems) RSA cryptosystem (Rivest-Shamir-Adleman) Diffie-Hellman key-exchange ( ) ElGamal encryption I 27
42 (public-key cryptosystems) RSA cryptosystem (Rivest-Shamir-Adleman) Diffie-Hellman key-exchange ( ) ElGamal encryption I 27
43 : RSA Rivest, Shamir, Adleman (1977) p, q n = pq n e d n e d n e d n n = pq ( ) I 28
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