Encyclopedia of Cryptography and Security

2011 Edition
| Editors: Henk C. A. van Tilborg, Sushil Jajodia

Galois Counter Mode

Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-5906-5_451



Related Concepts


Galois Counter Mode (GCM) is a block cipher mode of operation that provides authenticated encryption with associated data. It has a minimal computational cost and is widely used in practice, especially at higher data rates.


A mode of operation of a block cipher uses a block cipher, along with other operations, to encrypt or authenticate a message (Encryption and Authentication). A mode of operation that provides authenticated encryption with associated data (AEAD) will encrypt and authenticate a message, and at the same time, authenticate (but not encrypt) a string of associated data. In practice, a typical use of an AEAD algorithm is to protect a packet by encrypting and authenticating the body of a data packet, and authenticating (but not encrypting) the packet header.

The same block cipher used in different modes...

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Recommended Reading

  1. 1.
    Dworkin M (Nov 2007) Recommendation for block cipher modes of operation: galois/counter mode (GCM) and GMAC. NIST Special Publication 800-38D, National Institute of Standards and Technology, GaithersburgGoogle Scholar
  2. 2.
    McGrew D (Dec 2005) Efficient authentication of large, dynamic data sets using Galois/counter mode (GCM). In: Third international IEEE security in storage workshop, San FranciscoGoogle Scholar
  3. 3.
    McGrew D, Viega J (Oct 2004) The security and performance of the Galois/counter mode (GCM) of operation. In: Proceedings of INDOCRYPT04, Chennai. Springer, Berlin. Full paper available from the IACR cryptology ePrint archive: Report 2004/193. http://eprint.iacr.org/2004/193/

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.PoolesvilleUSA