Methods and apparatus are presented for encrypting and authenticating data, wherein some data is encrypted and some data is not encrypted, but all of the data is authenticated. Different formulations for authentication blocks are used according to whether a block of data occupies a cleartext position or ciphertext position. The authentication blocks are then combined to form a checksum, which is encrypted to form an authentication tag.

 
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> Method and system for determining and maintaining trust in digital image files with certifiable time

> Protecting decrypted compressed content and decrypted decompressed content at a digital rights management client
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