Quote from: wsxdrfv on June 17, 2018, 02:47:55 AM

[1] All coins received via address generated before encryption, B can use them also?
[2] And all coins received via address generated after encryption, only B can use them?
[3] And all coins received via address generated after encryption at A's computer (A2), A and B can use them?

Depends, if the wallet isn't HD (Hierarchical Deterministic) (~~Ex. Bitcoin Core Wallet~~), the answers are:
[1] Yes
[2] Yes
[3] No
Encryption won't affect the new address (private key) generation of the wallet, any new generated addresses after the separation are randomized which will produce different new addresses for wallet A & B.

If the wallet is an HD wallet with a SEED (Ex. Electrum), it's:
[1] Yes
[2] No
[3] Yes
Any new Private keys are based on the wallet's seed so, if you generate more addresses, both A & B wallet will produce the same.