MV Elliptic Curve Cryptosystem

Select NIST Curve over Prime Field

-the curve selection gives you your basepoint G, values for p, values for a and b

Calculate your public key - or type in Qx and Qy - a recived public key

type in n, your private key: n required n required for decryption

only numbers only numbers for decryption

resulting point Q :

Qx = Qx required

Qy = Qy required

Then n is your private key and Q your public key.

Encode your message to ASCII decimal value here:

Message: message required for ascii encoding
Sorry only max 30 english letters A-Z a-z and numbers

Message to be encrypted (ASCII decimal numbers if you encoded above) :

Encrypt ASCII encoded message with public key Q and NIST curve selected above

type in a random number k for encryption: k required

encryption result:

Rx: Rx required for decryption

Ry Ry required for decryption

c1 c1 required for decryption

c2 c2 required for decryption

Decrypt message above with private key n and NIST curve selected above

result is message in two parts. Decode below

m1 m1 required

m2

Decode ASCII decimal text

only if the message was ascii encoded with the tool above

Message:

nb: Encoding and decoding according to the ascii table decimal values normalized to 3 digits

How to test this:
Type in a private key n: eg. 42
press: Calculate nG=Q. This i a public key
Encrypt somthing with a public key:
type in message eg. "live long and prosper" and press: Encode
type in a random number for encryption e.g. 666
press:Encrypt
Decrypt a ciffertext
press: Decrypt
Press: Decode ascii to text
The orange box with the message hopefully now says "live long and prosper"
Try also the randomizers for n and k

tip: if your message is just any number you can type it in directly in the green box

disclaimer: implementation is not rock solid industrial strength. Only for educational and illustrational purpose.
contact: c h r i s t e l @ c h r i s t e l . d k