MODERN CRYPTOGRAPHY

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Digital Signatures and User Authentication using Public Key Cryptography • Can take place between any two parties, A and B provided they each know the other’s public key Typical authentication scheme: A sends a challenge (encrypted using B’s public key) to B. If B returns the challenge in clear then A believes it came from B Data Integrity: A sends a message to B with a cryptographic checksum (digital signature) calculated using A’s private key. B uses A’s public key to check the digital signature IMA 2009 32
Attacks on Scheme Implementing RSA If A and B use RSA for authentication and/or digital signatures then, if I want to impersonate A, I must either • Obtain A’s private key • Convince B that my public key belongs to A NOTE: A standard method of protecting against the latter attacks is to use a Public Key Infrastructure (PKI). This is a significant overhead • Identity based encryption? IMA 2009 33
Page 1 and 2: MODERN CRYPTOGRAPHY Fred Piper Code
Page 3 and 4: “Many cryptographic systems rely
Page 5 and 6: Two Types of Cipher System • Conv
Page 7 and 8: Cryptographic System • Design alg
Page 9 and 10: Implementing Cryptographic Algorith
Page 11 and 12: Side Channel Attacks To find a cryp
Page 13 and 14: Side Channel Attacks • Changed th
Page 15 and 16: Enigma Machine • Polyalphabetic c
Page 17 and 18: Lessons from Bletchley Park? • In
Page 19 and 20: Use of Cryptography Service • Con
Page 21 and 22: What is Cryptography Now? • A thr
Page 23 and 24: Cryptographic conjectures made in 1
Page 25 and 26: Key Search for DES 56 bit key requi
Page 27 and 28: DES: Key Search on Internet (1997)
Page 29 and 30: Fast DES Key Search DES Breaker use
Page 31: User Authentication and Data Integr
Page 35 and 36: RSA: The Theory (1) n = pq where p,
Page 37 and 38: RSA Security Problem The theoretica
Page 39 and 40: RSA Implementation RSA involves com
Page 41 and 42: Saints or Sinners ? Sender Receiver
Page 43: Cryptography and You • SSL • AT

MODERN CRYPTOGRAPHY

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