Asymmetric cryptography: Secure generation of RSA and ECDSA key pairs locally
Understand the principles of asymmetric cryptography and learn the differences between RSA and ECDSA signature algorithms.
Asymmetric cryptography: Secure generation of RSA and ECDSA key pairs locally
The foundation of modern internet security (from HTTPS certificates to SSH connections and blockchain transactions) lies in asymmetric or public key cryptography.
The principle of two keys
Unlike symmetric cryptography (where the same password is used to encrypt and decrypt), the asymmetric model uses two mathematically connected keys:
- Public Key: It is shared freely and allows anyone to encrypt messages for you or verify your signature.
- Private Key: It remains hidden and allows you to decipher the information or digitally sign documents proving your authorship.
RSA vs. ECDSA
When configuring systems, the two dominant options are:
- RSA: The traditional trust algorithm. Although extremely secure, it requires key lengths of at least 2048 or 4096 bits to withstand modern computing power.
- ECDSA (Elliptic Curve Cryptography): The modern alternative. With only 256 bits, ECDSA matches the security of a 3072-bit RSA key, consuming fewer resources and speeding up transactions.
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