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Active attacks on CPA-secure encryption

Active attacks on CPA-secure encryption

Online Cryptography Course Dan Boneh. Authenticated Encryption. Active attacks on CPA-secure encryption. Recap: the story so far. Confidentiality : semantic security against a CPA attack E ncryption secure against eavesdropping only Integrity :

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836 views • 62 slides
The ElGamal Public-key System

The ElGamal Public-key System

Online Cryptography Course Dan Boneh. Public key encryption from Diffie -Hellman. The ElGamal Public-key System. Recap: public key encryption: (Gen, E, D). Gen. pk. s k. E. D. m. c. c. m. Recap: public-key encryption applications.

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613 views • 41 slides
CBC-MAC and NMAC

CBC-MAC and NMAC

Online Cryptography Course Dan Boneh. Message Integrity. CBC-MAC and NMAC. MACs and PRFs. Recall: secure PRF F ? secure MAC, as long as |Y| is large S(k, m) = F(k, m) Our goal: given a PRF for short messages (AES)

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419 views • 13 slides
Modes of operation: many time key (CBC)

Modes of operation: many time key (CBC)

Online Cryptography Course Dan Boneh. Using block ciphers. Modes of operation: many time key (CBC). Example applications : 1. File systems: Same AES key used to encrypt many files. 2. IPsec : Same AES key used to encrypt many packets.

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214 views • 10 slides
Format preserving encryption

Format preserving encryption

Online Cryptography Course Dan Boneh. Odds and ends. Format preserving encryption. Encrypting credit card numbers. Goal: end-to-end encryption Intermediate processors expect to see a credit card number

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500 views • 8 slides

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