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Project Of Telecommunication

Project Of Telecommunication. Subject: Describe following “ MAC - Message Authentication Code " modes: MAC, CBC-MAC, HMAC, OMACv1, OMACv2, PMAC. Hakim Roqai Chaoui. Raphael Morel. The choice of the subject. Cryptography is an interdisciplinary subject present on several fields

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Project Of Telecommunication

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  1. Project Of Telecommunication Subject: Describe following “ MAC - Message Authentication Code " modes: MAC, CBC-MAC, HMAC, OMACv1, OMACv2, PMAC Hakim Roqai Chaoui Raphael Morel ISEP / Fakulta Elektrotecknika

  2. The choice of the subject • Cryptography is an interdisciplinary subject present on several fields • It is the main tool used in computer and network security for such things as access control and information confidentiality • It finds many applications that touch everyday life: the security of ATM cards, computer passwords … ISEP / Fakulta Elektrotecknika

  3. The choice of the subject It seems to be interessant to learn: - a new method of cryptography like the MAC algorithms - block cipher algorithms like OMAC, CBC-MAC and PMAC - cryptographic hash functions like HMAC ISEP / Fakulta Elektrotecknika

  4. How do we proceed? • First we used internet in order to know what the project dealt with. Our sources were from Google, wikipedia and other universities internet sites • After that, we focused on the real subject and began to understand the different methods of cryptography • And finally we made the final report ISEP / Fakulta Elektrotecknika

  5. What we have learnt • MAC is a short piece of information used to authenticate a message • A MAC algorithm accepts as input a secret key and an arbitrary-length message to be authenticated, and outputs a MAC (sometimes known as a tag) • The sender and the receiver of the message must have the same key ISEP / Fakulta Elektrotecknika

  6. What is a block cipher ? • A block cipher consists of two paired algorithms, one for encryption, E, and another for decryption, E-1 • Both algorithms accept two inputs: an input block of size n bits and a key of size k bits, yielding an n-bit output block • For any one fixed key, decryption is the Inverse function of encryption, so that ISEP / Fakulta Elektrotecknika

  7. What is a block cipher ? Encryption: Decryption: ISEP / Fakulta Elektrotecknika

  8. Block cipher algorithms • OMAC, CBC-MAC and PMAC use block ciphers mode to create a message authentication code • They can save code space in very tiny embedded systems like for instance smart cards or nodes in cars ISEP / Fakulta Elektrotecknika

  9. What is a cryptographic hash function ? In cryptography, a cryptographic hash function is a hash function with certain additional security properties to make it suitable for use as a primitive in various information security applications, such as authentication and message integrity ISEP / Fakulta Elektrotecknika

  10. What is a cryptographic hash function ? A hash function takes a long string (or message) of any length as input and produces a fixed length string as output ISEP / Fakulta Elektrotecknika

  11. HMAC:keyed-hash message authentication code • HMAC is a type of MAC calculated using a cryptographic hash function in combination with a secret key • HMAC may be used to simultaneously verify both the data integrity and the authenticity of a message • The cryptographic strength of the HMAC depends upon the cryptographic strength of the underlying hash function and on the size and quality of the key ISEP / Fakulta Elektrotecknika

  12. Conclusion • We lost time on “ Mac address ” instead of MAC – Message Authentication Code • Difficulty to make research in English • We enjoyed to discover codes we have never learnt • Both works at the university and at home • Thank you for your hospitality and your happiness ISEP / Fakulta Elektrotecknika

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