3 Definitions, symbols and abbreviations

3GPP55.241GIA4 specificationSpecification of the GIA4 integrity algorithm for General Packet Radio Service (GPRS)TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 [1].

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3.2 Symbols

For the purposes of the present document, the following symbols apply:

= The assignment operator.

 The bitwise exclusive-OR operation.

|| The concatenation of the two operands.

KASUMI[x]_k The output of the KASUMI algorithm [2] applied to input value x
using the key k.

X[i] The i^th bit of the variable X. (X = X[0] || X[1] || X[2] || ….. ).

Y_i The i^th block of the variable Y. (Y = Y₀ || Y₁ || Y₂ || …. ).

3.3 Abbreviations

For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 [1].

CBC-MAC Cipher Block Chaining Message Authentication Code

MAC Message Authentication Code