Several interactive elliptic curve and bitcoin demonstrations.

• curve playground
• various ECDSA calculations
  • demonstrate calculation of a publickey, also how to crack a key given a re-used signing secret.
• using linear algebra to crack groups of related keys.
• calculator - a free form expression calculator.
• decode transactions
• run tests - used while developing, shows how the code is intended to be used.

Note that the javascript code works with both small integers and javascript's bigint numbers.

My elliptic curve implementations is intended to be readable, no attempt was made to make this cryptographically safe.

The calculations are performed by your browser, no data is sent to a server.

todo

• addressconverter
• message hash calculation
• transaction hash calculation
• address hash calculation
• add support for comments to the calculator
• add grid display of several real curves with differnt a,b
• can you calculate the real-valued logarithm?
• improve display of annotate values, adding the tag-attribute in a hover popup.
• explain the various hashing algorithms used.
• improve expression parser, fixing support for unary expressions.

AUTHOR

Willem Hengeveld itsme@xs4all.nl