Optimum RAte spoNGE or ORANGE in abbreviation, is an authenticated encryption and sponge hash scheme based on any permutation, that employs sponge based encryption and hash which can absorb data in the optimum rate. The ORANGE based AE and Hash functions are named as ORANGE-Zest and ORANGISH respectively .
The mode for ORANGE-Zest is a close variant of sponge with full state absorption. The full state absorption is possible as we hold another state of size 128-bits, a part of the output of previous execution of the underlying permutation. We use this dynamic secret state to mask a part of the ciphertext. For further details see ORANGE-Zest.
The mode of hash function ORANGISH is very close to the JH hash function which is one of the finalists of SHA3-competition. JH mode allows us to absorb 128 bit data for each permutation call. Thus, it has higher throughput compared with classical sponge hash function .For further details see ORANGISH.
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