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title = "Register"
description = "Register Documentation"
weight = 3
+++
POST request to `/register` endpoint
Lets a user to authenticate themselves to the system.
Only people who are enrolled to the class can open Gradecoin accounts.
This is enforced with your Student ID and a one time password you will receive.
# Authentication Process
> The bytes you are sending over the network are all Base64 Encoded
- Gradecoin's Public Key (`gradecoin_public_key`) is listed on our Moodle page. Download and load it it to your client.
- Create a JSON object (`P_AR`) with your `metu_id` ("e"+`6 chars`) and `public key` in base64 (PEM) format (`S_PK`) [reference](https://tls.mbed.org/kb/cryptography/asn1-key-structures-in-der-and-pem)
```json
{
"student_id": "e123456",
"passwd": "15 char secret",
"public_key": "---BEGIN PUBLIC KEY..."
}
```
- Pick a short temporary key (`k_temp`)
- Pick a random IV (`iv`).
- Encrypt the serialized string of `P_AR` with 128 bit block AES in CBC mode with Pkcs7 padding using the temporary key (`k_temp`), the result is `C_AR`. Encode this with base64.
- The temporary key you have picked `k_temp` is encrypted using RSA with OAEP padding scheme using SHA-256 with `gradecoin_public_key`, giving us `key_ciphertext`. Encode this with base64.
- Base64 encode the IV (`iv`) as well.
- The payload JSON object (`auth_request`) can be serialized now:
```json
{
"c": "C_AR",
"iv": "iv",
"key": "key_ciphertext"
}
```
If your authentication process was valid, you will be given access and your public key fingerprint that is your address.
You can now sign JWTs to send authorized transaction requests.
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