128 Bit or 256 Bit Encryption? - Computerphile

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What do the various levels of encryption mean, and why use one over another? Dr Mike Pound takes us through the cryptic world of encryption levels.

This video was filmed and edited by Sean Riley.

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why dont this dude has his own channel this guy is amazing wish i had a computer teacher like him

ivsalimeni

I think it's really important people understand 256 bits is not twice the security of 128 bits. It's twice that of "255 bits".

..

Was just going through a Dr. Pound binge of old Computerphile videos, and bam! All of a sudden, a new one 12 mintues ago. He is definitely my favourite presenter on this channel.

mattshnoop

I'm glad he addressed the naivety of the quantum computing argument. If I had a nickel for every uninformed person I've heard say "none of this encryption stuff even matters cuz QUANTUM, " then, I'd be a very rich man.

bearclaw

When an engineer says "20-25 years", they mean "well, it's hypothetically possible".

jansenart

This guy is my favorite on the channel

sin

I can listen to his talks all day long. He is amazing and his skills in explaining things is incredible.

principlefox

0:56
Key length.

2:39
AES attack.

3:49
RSA and Diffie-Hellman
*4:30 --> Elliptic Curves.

5:13
Quantum Computing.

5:33
Grover's algorithm.

6:59
Publick-key vs Quantum.

kvelez

"It's not about size. It's about the technique" :)

Fragsu

00:40 196 bit key should be 192 bit key ... Mike even says so a few seconds later :)

Dawwwg

Wow, what an informative video! I like the forward-thinking question of how these encryption standards will age as computing technology develops. You've got me off to research Grover's Algorithm.

waylonk

I have been looking for this type of explanation for a year now!!! Thank goodness I finally found this video.

kso

I would trust Dr. Pound with my passwords in plaintext

adamspihlman

Grover's algorithm will crack 128-bit encryption once they make quantum computers with the same clock speed as classical computers (i.e. in the very far future). 256-bit encryption would be crackable with galaxy-scale quantum computers, but not by a machine that would fit on one small planet.

marc-andreservant

Just appending the key to the end of the file is my new favorite encryption scheme. I mean that would probably prevent the file from opening properly for any format other than plain text so it would sort of protect you if the person stealing your data wasn't super motivated to figure out what was happening if the files didn't open right away, haha.

danieljensen

Best video in years! It's answers one of the most important questions I had for years ... by somebody I trust.

mumblic

Loving the sketch part with the comment section. Great stuff :)

IntraBratwurstParty

4:44 _It's not the size of the key, it's the encryption method you're throwing it at!_

KuruGDI

I really want to see this video again in 40 years time, see how broken it is by then.

Basieeee

This channel makes me want to enroll at Nottingham just to have more time with these guys

Aaronstotle

128 Bit or 256 Bit Encryption? - Computerphile

128 Bit or 256 Bit Encryption? - Computerphile

How secure is 256 bit security?

1 Bit 2 Bit 4 Bit 8 Bit 16 BIT 32 Bit 128 Bit 256 Bit 512 Bit 1024 Bit 2048 Bit (GOLDEN APPLE BITS)

1 Bit 2 Bit 4 Bit 8 Bit 16 BIT 32 Bit 128 Bit 256 Bit 512 Bit 1024 Bit 2048 Bit 4096 Bit 8192 Bit #2

1 Bit 2 Bit 4 Bit 8 Bit 16 BIT 32 Bit 128 Bit 256 Bit 512 Bit 1024 Bit 2048 Bit 4096 Bit 8192 Bit #1

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128 - 8192 bits endless numbers

1 Bit 2 Bit 4 Bit 8 Bit 16 BIT 32 Bit 128 Bit 256 Bit 512 Bit 1024 Bit 2048 Bit 4096 Bit 8192 Bit

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1 Bit 2 Bit 4 Bit 8 Bit 16 Bit 32 Bit 128 Bit 256 Bit 512 Bit 1024 Bit 2048 Bit 4096 Bit 8192 Bit

1 Bit 2 Bit 4 Bit 8 Bit 16 BIT 32 Bit 128 Bit 256 Bit 512 Bit 1024 Bit 2048 Bit 4096 Bit 8192 Bit