Encrypting with Block Ciphers

Information Security - Week 3
In this video: block ciphers, ideal block ciphers, cipher modes of operation, cipher-block chaining, CBC mode, counter mode, CTR mode, randomized encryption, initialization vectors, the Advanced Encryption Standard, AES
Undergraduate course on networking security and cryptography taught by Aleksander Essex, Ph.D., P.Eng., Associate professor of Software Engineering, Associate Chair (Graduate), Department of Electrical and Computer Engineering, Western University, Canada
Website:
essex.cc
Twitter:
/ aleksessex
Course topics include:
Confidentiality, authenticity, integrity, ciphers, plaintext, ciphertext, encryption, decryption, keys, key generation function, uniform random, semantic security, bits of security, brute force, Kerckhoff's principle, semantic security, ciphertext indistinguishability, IND-CPA, INC-CCA, block ciphers, message padding, PKCS 7, modes of operation, initialization vector, pseudo-random permutation, counter mode, cipher block chaining, electronic codebook mode, counter mode, CBC, ECB, CTR, Advanced Encryption Standard, AES, hash functions, random oracles, pre-image resistance, collision resistance, SHA-1, SHA-256, SHA3, SHA-513, MD5, message authentication codes, MACs, Galois counter mode, GCM, AEC-GCM, public-key cryptography, Diffie-Hellman, public-key agreement, Elliptic curve Diffie-Hellman, DHE, ECDHE, digital signatures, ECDSA, RSA signatures, PKCS v1.5, digital certificates, X.509, public-key infrastructure, PKI, certificate pinning, certificate revocation, CRL, trust store, Transport Layer Security, TLS, TLS 1.2, TLS 1.3, HTTP over TLS, HTTPS Secure Shell, SSH, ciphersuite, client hello, server hello, VPNs, TOR, 802.11, wifi encryption, client authentication, passwords, password hashing, password lengths, single sign-on, federated identity
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Music: Arp Bounce - Geographer
Support by RFM - NCM: bit.ly/2xGHypM
Slide template: Slidesgo including Flaticons with infographics & images by Freepik

[@alibaba888]

Only 7090 views? This is a hidden gem. Excellent teaching. Simple and on point. Thank you

[@HK-sw3vi]

well... now it's 7995 so yea

[@clueless_experimenter]

yes he is

[@mihalachebogdan1]

As a CyberSec student i can definitely confirm this is definitely a big big hidden gem 😂 This man deserves his flowers for this

[@es62476]

One of the best explanation. Simple and understandable. I really appreciate your hard work.

[@abrarmahi]

OMG this is saving my grade in cryptography

[@universalponcho]

This is very well done. Thank you for your service.

[@verynaughtyg]

Nicely explained. I am reading for CISSP exam and had the cryptoghraphic modes of symmetric cryptography. really helpful. thanks

[@MrMarkgyuro]

This was really helpful! Thank you!!

[@a224kkk]

great work.

[@user-sv4fo7ek7n]

Great video, much better than my university lectures about the topic.

[@brittanybaker2969]

great video

[@CalvinEchols]

Wow this is a great video!

[@arlene5990]

nice explanation!

[@oluwatosinogunjobi6264]

thank you for this video

[@nizarealissa6078]

........This saved me ......i can finally comprehend things

[@user-sb5ds8vl6b]

that was very helpful! :)

[@KamiK4ze]

This is a really good video!

[@KamiK4ze]

You should cover more cryptography topics!

[@pjtrusci]

Appreciate it

[@donaldciappara]

I am impressed with the simplicity of this explanation, explaining such a complex subject. I have a query regarding the diagram shown at 10:17 of the video, it seems that the XOR function is not being well computed in the second set, 01 XOR 00 is not equal to 00. The error is rippling through the process. This is my interpretation, subject to correction.

[@aleksanderessex7328]

Step 1: Compute 01 xor 00 = 01 Step 2: Compute Enc(01) = 00

[@donaldciappara]

Thankyou@@aleksanderessex7328

[@1UniverseGames]

Is it possible sir to show it in programming perspective like how it implemented. It will be helpful, also a bit of its Mathematical explanation

[@aleksanderessex7328]

Showing crypto from a programmatic perspective may do more harm than good because it might leave even the tiniest impression that coding one's own crypto is a good idea. With that disclaimer made, you may be interested in cryptopals.com

[@mihalachebogdan1]

​@@aleksanderessex7328 Yep , this is one of the first thing our cryptology professor told us not to do. 😂💯 Programming own ciphers or own cryptology is a very big mistake . One might think its very secure and no one could break into while an expert in the cryptanalysis field could attack it in under 10 minutes and own one's soul instantly.

[@ShopperPlug]

would be nice which mode is best for which application.

[@aleksanderessex7328]

If you're rolling your own crypto, the answer is none of the above. If you're tuning your OpenSSL config, look at the kind of sites that get A+ on www.ssllabs.com/ssltest/

[@ShopperPlug]

@@aleksanderessex7328 thank you for replying Alexander. I am actually going to roll on my own crypto server. Would it be alright if I made a KZbin video explaining my server system design and have you judge it? The reason why is because I’m not pleased with today’s standards, it’s just not safe enough.

[@dsoni5982]

Why 00 XOR 10 is 01 at 9:51 ? wouldn't it be 10?

[@AP-qs2zf]

exactly this guy is full of bs

[@StormChaos]

Why must Zoom continue to be used in classrooms? The university should know about the security flaws!

[@mightyelon2583]

Can somebody explain what was meant about ECB at kzbin.info/www/bejne/pYemdIuQm9WoY9k? ""Clearly you can win the eavesdropping game here quite easily. All you have to do is to create two different messages that contain structure that are larger than the ECB block length. ECB mode doesn't disrupt that larger scale structure." By the way, very helpful video with excellent examples. Thank you so much.

[@aleksanderessex7328]

What I'm saying is that the cipher hides structure within a plaintext block, but, on its own, does not hide macro structure between blocks. For this, we need a better cipher mode of operation.

[@clueless_experimenter]

This kinda answered my question of what a "cipher table" seen in en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_(CTR) ?

[@AP-qs2zf]

second xor is wrong 9:55

[@mihalachebogdan1]

Give this man his flowers for this video 😂💯 This is more than a hidden gem , im so happy i found this 🫡 Salute