I am learning about stream ciphers, which apparently are unpopular. I just want to have a better idea of some basic algorithms that are in use or were in use till recently.
- the OTP: Apparently great but unpractical
- Linear Congruent Generator: insecure
- LFSR: not sure yet but it appears insecure
Can you suggest a few not overly complicated stream cipher algorithms, with some practical relevance, that one should check and maybe indicate where is it applied ?