Just as an unnoficcial hint:
the ABBAABBAAA BAAABAABAAABBBBBABAABAABBAAAAABAABBABAAAABBBAABBAB
part is (as stated by the number-letter replacement a "key")
"polyalphabetic" is my hint (use google friends!)
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you mean this ?
No, as this:
key: ABCDAB CD ABCDA BCD ABCDABCDABCD
text: CRYPTO IS SHORT FOR CRYPTOGRAPHY
chipher: CSASTP KV SIQUT GQU CSASTPIUAQBJ
(as you may note, "crypto"'s cipher and plaintext's strings match)