Как доказать подлинность аудиозаписи?

2693
rahuldottech

Гипотетическая ситуация: у меня есть запись, в которой есть доказательства того, что мой друг готовится убить иностранного посла. Будучи тем, кто всегда придерживается того, что правильно, я планирую раскрыть эти планы. Как мне доказать, что эти файлы не были отредактированы или изменены каким-либо образом?

Вдохновлен этим постом.

-2
С теоретической точки зрения, вы не могли бы, потому что вы можете только опровергнуть. только докажи. Это означает, что вы должны искать признаки взлома и развивать степень уверенности в том, что поток не изменен. Некоторые следы могут быть цифровыми, а другие аналоговыми, поэтому некоторые видны на оцилископе, или на ухе, или в шестнадцатеричном редакторе. Frank Thomas 8 лет назад 0
При достаточной вычислительной мощности взлом может быть сделан необнаружимым ... DavidPostill 8 лет назад 0

3 ответа на вопрос

0
Jonno

I'd say the same answer as the inspiration post - you can't. Audio can be modified, the wave forms could be examined to see any particularly odd spikes in audio where something had been cut, but someone who knew what they were doing could edit audio pretty convincingly.

Audio is edited all the time in film and music and most people would never even realise it. Of course, voice is a little easier to believe as it's hard to fake someones voice, but even still with careful editing the context of things can easily be changed.

As an example - this clearly wasn't what he was actually saying or implying, but with the audio alone it seems pretty convincing.

0
konqui

you can't proof if voice recordings are changed unleast you know very much about recording, audio and digital signal processing and even the you can't tell 100% that there has nothing been done with it.

if you don't trust the source from where/who you have gotten the recording you also shouldn't trust the recording.

thats why an audio-sample is just used as supporting evidence never as the main-evidence.

there is one thing on all digital media one can do to recognize that they may have changed this thing is called checksum or also digital signature.

it can bee used to proof that a digital media didn't change from when the author created it till an other one recives it but it can't proof that the author himselfs didn't change it.

i think the best answer will be it doesn't belong to you to proof wether the recording is orignal or not.

it is the same as if it would be a audio-tape the one who have to decide wether it is original or not are the forensic-analysts of the police and at last the jury and the judge.

as long as they all accept it as a evidence it doesn't matter if it really is a original or not.

0
Tetsujin

One possibility of improving the security of an audio recording is to supplement it with video.
In a single clean shot with a clock in the background, it would be harder to fake - though still not actually impossible, see what can be done with enough money & CGI in any modern Hollywood movie… those dinosaurs are not actually there ;-)

This Simpson's extract gives a humorous view of how intent can be changed through 'judicious' editing.

https://www.youtube.com/watch?v=qEGFaOeUm2A

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