Fwd: invalid byte sequence for encoding "UTF8": 0x95-while using PGPEncryption -PostgreSQL

I was working on Asymmetric encryption in postgres using pgcrypto . I have generated the keys and stored in data folder and had  inserted the data using pgcrypto encrypt function .

here the problem comes, I was trying to decrypt the data but it was throwing me the below error 

ERROR:  invalid byte sequence for encoding "UTF8": 0x95

Please find the below process which I followed 

Generated the keys :

CREATE EXTENSION pgcrypto;

$ gpg --list-keys
/home/ec2-user/.gnupg/pubring.gpg
--------------------------------

pub   2048R/8GGGFF 2020-03-19
uid       [ultimate] postgres
sub   2048R/GGGFF7 2020-03-19

create table users(username varchar(100),id integer,ssn bytea);

postgres=# INSERT INTO users VALUES('randomname',7,pgp_pub_encrypt('434-88-8880',dearmor(pg_read_file('keys/public.key'))));

INSERT 0 1

postgres=# SELECT pgp_pub_decrypt(ssn,dearmor(pg_read_file('keys/private.key'))) AS mydata FROM users;

ERROR:  invalid byte sequence for encoding "UTF8": 0x95

postgres=# show client_encoding;
 client_encoding
-----------------
 UTF8
(1 row)

postgres=# show server_encoding;
 server_encoding
-----------------
 UTF8
(1 row)

Can anyone please help me on this , I am not sure why I was getting this error.