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Ciphers like PRINCE or LED seem to use identical round keys. Does anybody know other cipher (may include hash functions, MACs or AEADs) that has the same property?

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LED and prince ciphers are designed for lightweight purpose (to save area, energy..etc) , They have no key schedule. Other ciphers that have no key schedule are Zorro, Midori, LS-designs (Fantomas & Robin).

The above mentioned ciphers use round constant addition for protection.

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