Variably Modified Permutation Composition (VMPC) is a cryptographic construction primarily associated with the design of secure cryptographic primitives, such as stream ciphers and pseudorandom number generators. It was introduced by its creator, Bartosz Zbitkowski, as a modification of a permutation-based approach to cryptography. ### Key Concepts: 1. **Permutation**: In computer science, a permutation refers to an arrangement of elements in a particular order.
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