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In your interpretation of the message, you're performing a step that a computer wouldn't: you're assuming the output of the base64 decoding process is ASCII-encoded hexadecimal and converting it to binary before performing the disassembly process. The first few bytes of the message are (note: there's a newline before the 5 571266161278423 with hex values ...


4

If it looks like base64 but isn't quite, it might be base64 with a custom alphabet. This is something that malware writers do to avoid detection (e.g., with data being exfiltrated) and that web application developers do when they think they're being clever (they're usually quite wrong, thinking it's harder to suss out than it is). I haven't tried to do so, ...


2

To answer your two specific examples: Most Western computer systems don't have fonts with complete coverage of CJK characters, and when they do, the appearance isn't always correct. Having a password displayed to you as a series of boxes isn't particularly useful, and worse, some programs will replace those un-displayable characters with substitutes, ...



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