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//0x50 bytes (sizeof)
struct _KALPC_SECURITY_DATA
{
    struct _ALPC_HANDLE_TABLE* HandleTable;                                 //0x0
    VOID* ContextHandle;                                                    //0x4
    struct _EPROCESS* OwningProcess;                                        //0x8
    struct _ALPC_PORT* OwnerPort;                                           //0xc
    struct _SECURITY_CLIENT_CONTEXT DynamicSecurity;                        //0x10
    union
    {
        struct
        {
            ULONG Revoked:1;                                                //0x4c
            ULONG Impersonated:1;                                           //0x4c
        } s1;                                                               //0x4c
    } u1;                                                                   //0x4c
};