c - Trying to encrypt and decrypt code-beginner -

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so bit maniuplation excercise im confused how convert letters numbers, think these arent binary dont know mean. can suggest approach?

here's 2 examples of encryption: "cats" , "kittens".

pairs: "ca ts" "ki tt en s_" (_ represents space) ints: 25441 29811 27497 29812 25966 29472 xor 31337: 6408 3610 4352 3613 7943 2377

the decimal quintet each couple of letters decimal representation of concatenated hex values of characters in ascii, eg:

"ca" = 0x63 0x61 = 0x6361 = 25441

same story xor key 

31337 = 0x7a69

indeed

0x6361 ^ 0x7a69 = 0x1908 = 6408 in decimal

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