> Wouldn't it be more secure if they hashed the imei before placing it into
> the header?  This way a unique hash can be used as an authentication key.
> Hashes are more difficult to match.  Or to make it more difficult, slit the
> imei into 2, hash both parts, and combine them together in the same string.
> An md5 hash for example is 33 bytes long, if using that method, the app/site
> would send a long 66 byte hashed imei to the server to uniquely identify
> itself.  If I built an android app, I'd use this method to secure each apps
> license and in-app purchases.

NTT Docomo says IMEI is not hashed. No changed. It's just a plain text
in HTTP User-Agent header and original header.
Please See:
http://www.nttdocomo.co.jp/service/developer/smart_phone/service_lineup/music_movie/index.html

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