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ElGamal Signature
ElGamal Signature
The ElGamal signature scheme (1985) — distinct from ElGamal encryption already in this registry. Historically the direct ancestor of DSA: DSA is this scheme computed in a smaller prime-order subgroup for shorter signatures.
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An asymmetric cipher based on the difficulty of factoring large semiprimes. Supports key generation, encryption, and decryption.
The finite-field discrete-log ancestor of ECDSA (NIST FIPS 186, 1994) — same r/s signature equation, computed in a prime-order subgroup instead of on a curve. Demo uses toy parameters; real DSA needs p>=2048 bits, q>=224 bits.
A key exchange protocol enabling two parties to establish a shared secret over an insecure channel.
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