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## Possible Answers:**PRINCE**.

**PRINCE**.

Last seen on: The Guardian – Cryptic Crossword No 27,822 – May 15 2019

### 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.