Digital signatures sit at the core of web security, blockchains, and TLS. The article compares RSA, ECDSA, and the newer Ed25519, using Go benchmarks to expose real‑world speed differences. RSA relies on prime‑factorization and requires 2048‑ to 4096‑bit keys for 128‑bit security, while ECC achieves the same with only 256 bits, thanks to exponential hardness. Ed25519, a deterministic EdDSA variant, delivers the fastest signing and verification, with key generation and signing in a few microseconds on an Apple M1. RSA verification remains the quickest, but its key generation is orders of magnitude slower. The piece explains why RSA’s public exponent 65537 makes verification cheap, and why ECC’s short keys stay strong.

It also highlights that symmetric encryption runs on simple bitwise operations, whereas public‑key math forces CPUs to perform large‑integer arithmetic, explaining the heavier load. For modern applications, the recommendation leans toward Ed25519 for its balance of speed, compactness, and security. Future work will dive deeper into NIST SP 800‑57.