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There are lots of security algorithms. One of the way to measure security of a cryptography algorithm is to find out its key size. There are many key size of a single algorithm. But how can I calculate key size of an algorithm? How a single algorithm has different key size? There is no standardized method that can help you with that. The best way to ...


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How to calculate key size of a security algorithm? The answer to this question is completely dependant on the algorithm. It depends on how the algorithm processes it (like how the key stream is generated, or how it influences the ciphertext), and how secure it is against brute-force attack. A small key can be brute-forced, as in the case of DES. Key ...


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I know of a proposal from Matsuo in 2007, called "Hybrid Proxy Re-Encryption", which allowed to transform PKE ciphertexts to IBE ciphertexts. This proposal is designed for a specific PKE and IBE scheme, not for generic ones. Note also that this is not what we usually understand by the term "proxy re-encryption", which is devoted to transforming ciphertexts ...



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