ECC Encryption / Decryption

[Sanath Prasanna]

Hi,

I want to encrypt a text message using ECC & need to decrypt. Can someone give me a sample for that process ?

Br,

Robert 

[Jesper Louis Andersen]

On Sun, May 2, 2021 at 1:33 PM Sanath Prasanna <ahe.s...@gmail.com> wrote:

Hi,

I want to encrypt a text message using ECC & need to decrypt. Can someone give me a sample for that process ?

You will probably have to give more information.

There are several different types of ECC methods, and inside these, there are a couple of different elliptic curves you can choose from, and some of them are standardized requirements for certain applications.

Furthermore, ECC is often used as a tool in a larger toolbox. It's used to agree on a (shared) secret key for an underlying block or stream cipher, and in some situations also for agreeing on message authentication (which protects the message integrity against tampering).

Getting this toolbox / tooling construction wrong can result in the proposed solution being insecure, so beware.

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J.

[Sanath Prasanna]

Tx Jesper for your kind response.  Here attached my sample test file &  following one is not working. That is the expected other Encoding scheme. (ShaXxxx)

EncryptMsg = public_key:encrypt_private(Msg, ECPublicKey), (line 64)

Can you give some guide to over come this ?

br,

Robert

[Jesper Louis Andersen]

One particular problem is that `public_key:encrypt_private` is the RSA algorithm, and not ECC. You need `crypto:private_encrypt/4` if you want to do ECC.

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J.

[Sanath Prasanna]

Tx Jsesper for your guidance. But still I cannot do that & error came for below line

EncryptMsg = crypto:private_encrypt(rsa, Msg, ECPrivateKey, rsa_no_padding),

here attached sample file. 

[Sanath Prasanna]

Jesper, any comment regarding my problem ?

Br,

Robert

[Jesper Louis Andersen]

I'm not your Oracle.

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J.

[Sanath Prasanna]

Hi Jesper,

Sorry for trouble you.. Tx for your guidance far. 

Br,

Robert..