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(A brief, incomplete) Introduction to Authenticated Encryption Tom Shrimpton Summer School on Real-World Crypto and Privacy June 11, 2018 Authenticated Encryption M M Its complicated Probabilistic or deterministic AE? Nonce based AE?

  1. (A brief, incomplete) Introduction to Authenticated Encryption Tom Shrimpton Summer School on Real-World Crypto and Privacy June 11, 2018

  2. Authenticated Encryption M M

  3. It’s complicated… Probabilistic or deterministic AE? Nonce based AE? What happens if a nonce repeats? Do I need to support associated data? What primitives should we build upon? encryption + MAC? (tweakable) wide-block cip sponges? ... What should happen when decryption fails? Is it safe to provide multiple, descriptive exceptions/error messages? Stop all future processing, or just for this message? What kind of information can decryption safely leak? Safe to release plaintext data “early”? Online encryption/decryption property? ”Atomic” plaintexts/ciphertexts, or stream-based? (Authenticated encryption != Secure Channel)

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