Question: In the 128-EEA2 encryption scheme used in 3GPP SAE, how are the subsequent 128-bit counter blocks (T2, T3, ...) generated after the initial block (T1)?
Option 1: By XORing the previous counter block with a predefined constant value.
Option 2: By applying a standard integer incrementing function to the most significant 64 bits of the previous counter block.
Option 3: By applying a standard integer incrementing function mod 2^64 to the least significant 64 bits of the previous counter block.
Option 4: By rotating the bits of the previous counter block by a fixed number of positions.
Explanation: This is correct because subsequent counter blocks are obtained by applying the standard integer incrementing function modulo 2^64 to the least significant 64 bits of the previous counter block, ensuring a predictable and secure sequence for CTR mode encryption.