The Mechanics of 3G Cryptography by D. Dhebar

Author:D. Dhebar
Language: eng
Format: epub
ISBN: 9781445701455
Publisher: Bright Pen
Published: 2013-01-15T00:00:00+00:00

In A0 above, notice the 64000000 after COUNT = 72A4F20F. This is because each hexadecimal character can be expressed by up to (and is normally written as) four binary digits, since 24 = 16. If 72A4F20F was followed by BEARER = 0C and DIRECTION = 1, then so far it would have read 72A4F20F 0C 1. The problem then remains how to express the right-most 26 zero bits in hexadecimal; this cannot be done since 26 has no factor of four. Therefore, the way to interpret A0 above is shown by the comparisons below.

Continuing with the example then, let:

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