Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.

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Why shouldn't one build a MAC by XORing multiple message blocks?

I found this simple proposal for a MAC algorithm: Let the MAC of message M (which consists of message blocks $M_1$,$M_2$, ..., $M_n$) be the AES encryption with key K of the XOR of all the ...
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1answer
127 views

ASCII Message in TV show? [closed]

So I was watching a popular series tonight (Person Of Interest) when suddenly during a frame change I noticed a very quick blue screen with writing. At the time I never thought anything of it as it ...
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1answer
97 views

Storing the activation status of a product and expire details Android [closed]

In my Android application, it's required to store the activation status of the software and keep track of the activation expire date. What is the best way to store this information? Is it safe to ...
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1answer
220 views

Multi layer encryption with ECB mode [closed]

if i use the 2 of the same key with 2 of the same algoritm when encrypting in ECB like when i have 2 blocks of the same color and i encrypt the 2 blocks with the same color the cipher text should not ...
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1answer
553 views

Advantages of each encryption mode [closed]

What is the advantages of each encryption mode to other encryption mode.. for example what are advantages of CBC to PCBC, CBC to CFB just like that. so that I can filter what would be the best ...
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1answer
191 views

AES implementation in java that allows key of 320-bit length [closed]

I need an implementation of AES(Rijndael) in java that allows use of a 320-bit key. Please suggest a reliable implementation