# All Questions

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### Decipher APDU for OpenPGP smart card applet [migrated]

I'm implementing data deciphering into my Java application using javax.smartcardio APIs. I'm using Yubikey NEO smart card element. I managed to: Select OpenPGP applet ...
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### Branchless AES Implementation

Imagine a branchless implementation of the AES-128 cipher. Are there any benefits over the implementation that contains branches, other than possible prevention of timing attacks? Is it even true, ...
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### Is it an overkill to add external integrity check to the AES-GCM encoding?

There is a java library for android which implements integrity checking to predefined encrypting mode(which can be found here). Short class description from author page to avoid further questions ...
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### Is it secure to use ciphertext feedback with RC4?

Consider the following modification of RC4 to give some "ciphertext feedback" ...
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### Advantages of the general digraph trust model over the strict hierarchical model

Are there any advantages of using reverse certificates and the general digraph trust model over the strict hierarchical trust model as described here: In the digraph model each CA can generate ...

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