fix the "Invalid \uXXXX escape: line 1 column 12665 (char 12664)"

[HamzaBaniata]

when a miners attempts to synchronize with neighbors, this error appears sometimes and the longer chain is not transmitted. This is caused by a JSON parsing problem or limited encoding of RSA public keys.

related links:

https://bugs.python.org/issue11489
https://stackoverflow.com/questions/59454553/recursively-transform-dict-leaves-in-python

[HamzaBaniata]

This can also be fixed by adding a checker for each newly generated key.. encode it at the new_encryption_module before returning it, if it includes the invalid character, generate another one and check it again..