Which cipher is used in the new 5G network? I think that the stream ciphers SNOW 3G and AES are used in 4G (LTE). But I can't find which cipher is used in 5G networks and how encryption is done. Is there any official documentation?
Ericson's white paper lists them as


  The strong and well-proven security algorithms from the 4G system are reused. These are encryption algorithms based on SNOW 3G, AES-CTR, and ZUC; and integrity algorithms based on SNOW 3G, AES-CMAC, and ZUC. The main key derivation function is based on the secure HMAC-SHA-256. 


Notably, all of them are stream ciphers as CTR mode converts any block cipher into a stream cipher.


SNOW 3G is a word-based synchronous stream cipher developed by Thomas Johansson and Patrik Ekdahl at Lund University.
ZUC uses a 16-stage LFSRs with each stage in $GF(2^{31}-1)$ and produces a 32-bit word on each tick.