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Usually the public exponent is first chosen. Often it is the 4th prime of Fermat (e.g. -f4 for openssl), 65537. This number in binary is: 0000 0000 0000 0000 0001 0000 0000 0000 0001 Fermat primes are primes with just 2 bits set. 3, 5, 17, 257 and 65537 are the only known Fermat primes. It is relatively easy to use this as exponent as only two bits are ...


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I don't know your exact scenario. However you have two options to encrypt data using elliptic curve cryptography (ECC). I'd recommend going with the first option I present. Use elliptic curve integrated encryption scheme (ECIES). ECIES basically performs ElGamal-like encryption on a key. The key is generated at random and encrypted like in ElGamal (replace ...


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S-DES is a toy cipher intended for learning, defined by Edward F. Schaefer, A Simplified Data Encryption Standard Algorithm, in Cryptologia Volume 20, Issue 1, 1996 (paywalled with free preview). It has the same structure as DES, and uses the same notations: bits vectors (such as key and data) are numbered starting from 1 "on the left" functions of bit ...



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