Starter of nachos included in the cost one has to pay in The Palace

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Possible Answers: PRINCE.

Last seen on: Irish Times Crosaire – Apr 6 2021

Random information on the term “PRINCE”:

In the related key setting, the data complexity is 233 and the time complexity 264.

Prince is a block cipher targeting low latency, unrolled hardware implementations. It is based on the so-called FX construction. Its most notable feature is the “alpha reflection”: the decryption is the encryption with a related key which is very cheap to compute. Unlike most other “lightweight” ciphers, it has a small number of rounds and the layers constituting a round have low logic depth. As a result, fully unrolled implementation are able to reach much higher frequencies than AES or PRESENT. According to the authors, for the same time constraints and technologies, PRINCE uses 6–7 times less area than PRESENT-80 and 14–15 times less area than AES-128.

The block size is 64 bits and the key size is 128 bits. The key is split into two 64 bit keys K 0 {\displaystyle K_{0}} and K 1 {\displaystyle K_{1}} . The input is XORed with K 0 {\displaystyle K_{0}} , then is processed by a core function using K 1 {\displaystyle K_{1}} . The output of the core function is xored by K 0 ′ {\displaystyle K’_{0}} to produce the final output ( K 0 ′ {\displaystyle K_{0}’} is a value derived from K 0 {\displaystyle K_{0}} ). The decryption is done by exchanging K 0 {\displaystyle K_{0}} and K 0 ′ {\displaystyle K’_{0}} and by feeding the core function with K 1 {\displaystyle K_{1}} xored with a constant denoted alpha.

PRINCE on Wikipedia