Cryptography & Digital Signatures
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1 Cryptography & Digital Signatures CS 594 Special Topics/Kent Law School: Computer and Network Privacy and Security: Ethical, Legal, and Technical Consideration Prof. Sloan s Slides, 2007, 2008 Robert H. Sloan
2 Cryptography The science of sending secret messages Ancient history; people always interested in it Mentioned in Herodotus; the Hebrew Bible
3 Overview Uses: Secrecy, nonrepudiation, authentication Implementations: Rotor machines (Haeglin, Enigma) Computers, specialpurpose chips, etc.
4 Most basic scenario Alice uses encryption algorithm E to transform her message m, the plaintext (or cleartext), and a key k into ciphertext E(m,k). Intended recipient has key that allows him to decrypt the ciphertext E(m,k) and get back m.
5 Crypto In past century or two, secrecy rests upon secret key. I.e., ciphertext can be decrypted by anybody possessing (or guessing) the secret key. Before modern era (c ), security rests on some sort of mixing and can be broken with enough samples by statistical techniques (with exception of one-time pad)
6 Aside: Breaking Enigma Family of German rotor machines. Commercial originally; military Wehrmacht version is the famous one.
7 Breaking The Unbreakable 1932: Trio of Polish mathematicians led by Marian Rejewskibroke 3- rotor plus plugboard machine
8 Enigma continued 1939: Germans went up to 5 rotors; more than Polish system could handle July 1939 Polish mathematicians gave their techniques to French & British September 1939, Turing at Blechley Park begins effort to build Bombe to decrypt this Enigma and succeeds!
9 Modern era: 1976 Cryptography based on (computational) complexity theory theory of what can be computed quickly versus what can be computed slowly Goal: encryption, and decryption with possession of proper key can be computed very fast; decryption without key is very slow (e.g., 1 million years on best supercomputer). Currently: True if make unproven assumptions overwhelmingly believed by researchers in complexity theory. (E.g., Factoring not in P.)
10 Two kinds of crypto Symmetric or secret key: there is a unique key, and Alice and Bob must somehow arrange to share it so they but only they know it. In practice, very fast encrypt & decrypt Only kind of crypto prior to Asymmetric or public key: Each user has 2 keys: secret one to decrypt; public key that anybody can use to send her messages. Medium speed in practice.
11 Public-key cryptography: 1 A big random (i.e., pesudorandom) number is used to make a key pair.
12 Public-key cryptography: 2 Anyone can encrypt using public key; can decrypt only with private key Often encrypt & decrypt same function; only keys different
13 Some well-regarded publickey methods RSA Digital Signature Standard/Algorithm (DSS)/DSA (NIST standard; signatures only) El Gamal Various elliptic curve methods
14 Public-key in practice Because somewhat slower, used mostly for only two things: 1. Digital signatures 2. Various techniques having to do with key management & distribution (more soon)
15 Well-known private-key crypto Data Encryption System (DES): Standard from federal government in Fatal flaw for 21st century: 56-bit key length subject to bruteforce attacks. Still in use though! Triple DES; longer key length; popular stopgap as DES became scary. Advanced Encryption Standard (AES): newish standard from federal government; very fast, very secure; seeing slow conversion from legacy systems.
16 One-time pad Special case of secret key. Key length must be equal to message length (huge drawback). Provides perfect secrecy, with no assumptions whatsoever. Believed to be used for high-level diplomatic and intelligence work; may become more prevalent
17 Crypto Goals: confidentiality The obvious one. Use the cryptosystem. Advantage of public-key cryptography is that it allows for secrecy between two parties who have not arranged in advance to have a shared key (or trusted some third party to give it to them). Disadvantage is speed. Therefore, in practice, hybrid systems use public-key to establish session key for private key.
18 Goals: integrity Simplest form is an elaboration of the checksum: (cryptographic) hash function or message digest. Short signature of the message, bits that depend on entire message; extremely improbable that unequal messages have same hash. Popular functions: SHA-1 (weak?), SHA-256, SHA-384, SHA-512 (NIST); MD5 (Rivest) By itself, shows only no accidental corruption
19 Digital Signatures Use public-key cryptography backwards to sign messages. I.e., to sign m, Alice encrypts m with her private key; anybody can verify by using Alice s public key.
20 Non-repudiation + integrity A s digital signature of a cryptographic hash of message m guarantees that m was signed by A and that m was not altered. Anybody can computer the hash of m; anybody can verify A s signature. Or conceptually more complex Message Authentication Code (MAC)
21 How do I get Alice s public key? Even with public-key crypto and digital signatures, still have the problem of authentication: binding users to keys. Early days articles envisioned phonebook-like database with Name, Public Key entries Problem: How secure is that database?! Attacker can put in his own key for me, and start signing contracts (and checks!) in my name. Maybe we can secure the phonebook, but then that kills the idea of of keys widely, easily publicly available.
22 Certification Common solution today is for trusted 3 rd party certification authority (CA) to sign the user s public encryption key. Resulting certificate will contain, e.g., user s name/id, user s public key; CA s name; certificate s start date, and length of time it is valid. User publishes certificate Standard X.509 for format of certificate
23 Web of trust Alternative to CA is web-of-trust model of PGP, GnuPG, and OpenPGP. Key-signing party!
24 Encryption of Stored Data Routine to use encryption for transmission over network today; but in practice need more encryption of data at rest data stored locally. December 2004 Bank of America backup tapes with cleartext 1.2M government employees name, SSN, bank account # April 2005, San Jose Medical group had computer physically stolen: 200K patient
25 Encrypting data at rest Simple solution is to encrypt data at rest For laptops can use commercially available encryption package such as PGP Also now back-end appliances between data & backup device, various other products.
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