CHALLENGE 0521.1.2

(BOB TO EXPERTS)

1-44-64-41 51 41-5 95-01 95-52-64-96-53-1

56-81 53-66-51-52-44-46-5 95-52-64-51-96-31

96-54-96-63-9 42-66-44-9 62-1 56-52-64-96-53-1

56-8 53-66-51-52-44-46-5 62-1 56-52-64-51-96-31 96-93-92-63-31-2 93-52-4 56-81 41-44-7

91-52-62-2 42-46-64-2 43-52-6 56-93-81-4

01421 52-44-4 62-96-4-45-2 2-53-42-52-51-96-44-46-64-8 65-93-52-66-62-2

CHALLENGE 2897.2

(BOB TO HIGH LEVEL CRYPTOGRAPHERS ALL OF THE  WORLD )

8L7C2257C3 28D7L46C42 9M61146B77

C326C11516 C118L7C221 28D326D216

C48C8L8D8Q 6L8S7F88S 116C427C8L

2358117L22

CHALLENGE 2897.1

(BOB SENT A TELEGRAM TO ALICE[A VERY IMPORTANT COMMAND] LIKE THIS...)

6C226D628C12416C439M6...

CAN YOU SOLVE IT???

CHALLENGE 2906.2

(BOB'S VERY OLD CRYPTOGRAM)

@507 093 188 935 588 475 887 370

961 267 255 125 318 873 505 655

887 370 188 961 119 614 496 788

010 535 005 267 273 709 612 672

551 253 188 735 056 552 672 737

018 896 111