Salsa20
Salsa20 is a stream cipher designed by Daniel J. Bernstein in 2005 for high-speed encryption in software applications. It operates by generating a pseudorandom keystream from a key and nonce, which is then XORed with plaintext to produce ciphertext. Known for its simplicity, efficiency, and security, it is widely used in protocols like TLS and SSH for data encryption.
Developers should learn Salsa20 when implementing secure, high-performance encryption in applications such as network protocols, file encryption, or real-time communication systems. It is particularly useful in scenarios requiring fast encryption on constrained hardware or where resistance to timing attacks is critical, due to its constant-time operations and minimal computational overhead.