perl - Why the decode results of different string are same? -

$ perl -mmime::base64 -e 'print decode_base64("c3lux2fja0axnjmuy29t");' syn_ack@163.com  $ perl -mmime::base64 -e 'print decode_base64("ahn5bl9hy2tamtyzlmnvbq");' syn_ack@163.com 

the encode string different, decode results same, why?

your second string ahn5bl9hy2tamtyzlmnvbq decodes to:

�syn_ack@163.com 

the unusual character in first position might not printed terminal software.