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Category: Cryptography

Encryption functions, message digests, and elliptic curves powering bitcoin.

Question on DER-encoding of signature pair (r, s)

I’ve been working through the byte-level details of bitcoin transactions and I need some help on DER-encoding.Continue readingQuestion on DER-encoding of signature pair (r, s)

Categories In Cryptography
Tags Bitcoin, bitcointalk-scraped, Cryptography, DER encoding, ecdsa

Cryptography

How does “recid” variable work in libspec256k1 library?

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I’m trying to understand how does “recid” (Recovery ID) variable work in libspec256k1 library (with C language).Continue readingHow does “recid” variable work in libspec256k1 library?

Categories In Cryptography
Tags Bitcoin, bitcointalk-scraped, ecdsa, secp256k1

Cryptography

Using secp256k1 endomorphism

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The existence of the endomorphism is a roughly 20% speedup in a plain multi-exp due to halving the number of doublings.Continue readingUsing secp256k1 endomorphism

Categories In Cryptography
Tags Bitcoin, bitcointalk-scraped, Cryptography, secp256k1

Cryptography

Encrypting messages question

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It isn’t the same with signing/verifying that you prove you own the address.Continue readingEncrypting messages question