How to configure DKIM ED25519 signature?

[tazmaaktar]

To address the limitations of RSA signatures, DKIM introduced support for ED25519 signatures. The ED25519 algorithm is based on elliptic curve cryptography and offers several advantages: - ED25519 is considered highly secure against known cryptographic attacks. It provides a similar level of security to RSA, but with a shorter key length, which reduces the risk of key compromise. - ED25519 signatures offer higher performance than RSA signatures. The elliptic curve calculations involved in generating and verifying ED25519 signatures are significantly faster

resulting in shorter processing time and lower resource requirementsafghanistan phone number library. - ED25519 keys are shorter than RSA keys (256 bits) while providing the same level of security as 4096-bit RSA signing keys. This simplifies key management and reduces storage requirements, making it easier to handle for large-scale deployments. - The security of RSA signatures depends on the key size, and as computing power increases, larger keys are required. In contrast, ED25519 is expected to maintain its security strength even as technology advances, ensuring long-term viability.While DKIM ED25519 signatures offer many advantages over RSA signatures, it is important to consider backward compatibility with systems that may not support newer algorithms. To ensure maximum compatibility and reliability, it is recommended to implement a dual DKIM signing approach. This approach involves signing emails with both ED25519 signatures and RSA signatures. Here are the benefits: - Provides an additional layer of security, increasing the authentication and trust of emails. - Ensures backward compatibility with systems that do not support ED25519 signatures. - Can be flexibly configured based on the recipient's mail system and supported signature algorithms.