KeyChain is a relatively new addition. Its the only one available from API 14 (Ice Cream Sandwich) and above. Nikolai Elenkov has a good blog post on Using the ICS KeyChain API .
KeyStore is an even newer addition. Its only available on API 18 (Jelly Bean MR2) and above. Nikolai Elenkov has another good blog entry on Improvements for storing credentials in Android 4.3 .
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