KCDSA (Korean Certificate-based Digital Signature Algorithm) is a digital signature algorithm created by a team led by the Korea Internet & Security Agency (KISA). It is an ElGamal variant, similar to the Digital Signature Algorithm and GOST R 34.10-94. The standard algorithm is implemented over , but an elliptic curve variant (EC-KCDSA) is also specified.
KCDSA requires a collision-resistant cryptographic hash function that can produce a variable-sized output (from 128 to 256 bits, in 32-bit increments). HAS-160, another Korean standard, is the suggested choice.
- : a large prime such that for .
- : a prime factor of such that for .
- : a base element of order in .
- : signer's private signature key such that .
- : signer's public verification key computed by where .
- : a hash-value of Cert Data, i.e., .
- Signer randomly picks an integer and computes
- Then computes the first part:
- Then computes the second part:
- The signature is
- Verifier computes
- Then he checks if
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