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Online Cryptography Course: Understanding Crypto Primitives for Secure Communication

Join Dan Boneh's online course to learn how cryptography works and how to implement and analyze crypto primitives correctly for securing communication. The course covers various applications such as web traffic, file encryption, content protection, and user authentication. Gain insight into protocols like SSL/TLS for confidentiality and integrity. Understand the importance of encryption algorithms and key management. Enhance your knowledge in utilizing cryptography as a powerful security tool. 8 Relevant

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Online Cryptography Course: Understanding Crypto Primitives for Secure Communication

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  1. Online Cryptography Course Dan Boneh Introduction Course Overview

  2. Welcome Course objectives: • Learn how crypto primitives work • Learn how to use them correctly and reason about security My recommendations: • Take notes • Pause video frequently to think about the material • Answer the in-video questions

  3. Cryptography is everywhere Secure communication: • web traffic: HTTPS • wireless traffic: 802.11i WPA2 (and WEP), GSM, Bluetooth Encrypting files on disk: EFS, TrueCrypt Content protection (e.g. DVD, Blu-ray): CSS, AACS User authentication … and much much more

  4. Secure communication no eavesdropping no tampering

  5. Secure Sockets Layer / TLS Two main parts 1. Handshake Protocol: Establish shared secret key using public-key cryptography (2nd part of course) 2. Record Layer: Transmit data using shared secret key Ensure confidentiality and integrity (1st part of course)

  6. Protected files on disk Disk File 1 Alice Alice No eavesdropping No tampering File 2 Analogous to secure communication: Alice today sends a message to Alice tomorrow

  7. Building block: sym. encryption E, D: cipher k: secret key (e.g. 128 bits) m, c: plaintext, ciphertext Encryption algorithm is publicly known • Never use a proprietary cipher Alice Bob m D(k,c)=m E c D E(k,m)=c k k

  8. Use Cases Single use key: (one time key) • Key is only used to encrypt one message • encrypted email: new key generated for every email Multi use key: (many time key) • Key used to encrypt multiple messages • encrypted files: same key used to encrypt many files • Need more machinery than for one-time key

  9. Things to remember Cryptography is: • A tremendous tool • The basis for many security mechanisms Cryptography is not: • The solution to all security problems • Reliable unless implemented and used properly • Something you should try to invent yourself • many many examples of broken ad-hoc designs

  10. End of Segment

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