OCB:%20A%20Bock-Cipher%20Mode%20of%20Operation%20for%20Efficient%20Authenticated%20Encryption
https://www.powershow.com/viewht/da0bd-ZDc1Z/OCB_20A_20Bock-Cipher_20Mode_20of_20Operation_20for_20Efficient_20Authenticated_20Encryption_powerpoint_ppt_presentation
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