M C L CỤ Ụ
THU T NG VI T T TẬ Ữ Ế Ắ ...........................................................................................................V
L I NÓI Đ UỜ Ầ ....................................................................................................................................X
CH NG 1ƯƠ ...........................................................................................................................................1
GI I THI U CHUNG V B O M T VÔ TUY NỚ Ệ Ề Ả Ậ Ế ...................................................1
1.1 Các v n đ k thu t g p ph i trong truy n thông an toànấ ề ỹ ậ ặ ả ề .............................1
1.1.1 Nh n th cậ ự ..............................................................................................................1
1.1.2 Tính tin c yậ...........................................................................................................3
1.1.3 Tính toàn v nẹ........................................................................................................4
1.1.4 Tính kh d ngả ụ ......................................................................................................6
1.2 Các thu t toán mã hoáậ.....................................................................................................7
1.2.1 Mã hoá đ i x ngố ứ .................................................................................................8
1.2.2 Mã hoá b t đ i x ngấ ố ứ ..........................................................................................9
1.2.3 Hàm băm..............................................................................................................10
1.2.4 Mã nh n th c b n tinậ ự ả ......................................................................................11
1.2.5 Ch ký đi n tữ ệ ử..................................................................................................11
1.2.6 So sánh gi a mã hoá khoá công khai và khoá bí m tữ ậ ...............................12
1.2.7 T ng lai c a DES và AESươ ủ ............................................................................12
1.3 Qu n lý khoá m t mãả ậ ...................................................................................................13
1.3.1 T o khoáạ..............................................................................................................14
1.3.2 L u tr khoáư ữ ......................................................................................................17
1.3.3 Phân ph i khoáố..................................................................................................17
1.3.4 Thay đ i khóaổ.....................................................................................................20
1.3.5 H y khóaủ.............................................................................................................24
1.4 Đánh giá các thi t b mã hóaế ị .....................................................................................24
Ch ng IIươ ............................................................................................................................................27
KI N TRÚC B O M T M NG GSMẾ Ả Ậ Ạ .............................................................................27
2.1 Ki n trúc c b n c a h th ng GSMế ơ ả ủ ệ ố ...................................................................27
2.1.1 Các thành ph n h th ngầ ệ ố ................................................................................28
2.1.2 Các phân h c a m ng GSMệ ủ ạ .........................................................................31
2.1.3 Giao di n vô tuy n Umệ ế ...................................................................................32
2.2 Đ c đi m b o m t c a m ng GSMặ ể ả ậ ủ ạ ......................................................................33
2.2.1 AuC.......................................................................................................................34
2.2.2 HLR......................................................................................................................35
2.2.3 VLR......................................................................................................................35
2.2.4 Th SIMẻ..............................................................................................................35
2.2.5 IMSI và TMSI....................................................................................................36
2.2.6 Chu n mã hoá GSMẩ.........................................................................................37
2.2.7 Đa truy nh p phân chia theo th i gianậ ờ .........................................................40
II