Unlocking the Secrets of Symmetric Key Cryptography 🔐

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* Hello everyone, welcome back, in this video, I am explaining modern cryptography with three types of algorithms (Symmetric Key, Asymmetric Key, Hashing) commonly used today !

* Cryptographic Secrecy & Symmetric Key (secret / private key) Algorithms
^ Early days of cryptography, “security through obscurity”
^ Best way to keep algorithm secure was to hide details
^ Modern cryptosystems do not rely on algorithms secrecy
^ Rely on secrecy of one/more cryptographic keys used
^ Length of key is an extremely important factor in determining the strength of the cryptosystem
^ 56-bit Data Encryption Standard (DES) algorithm is no longer secure
^ Several advances in cryptanalysis techniques
^ Modern cryptographic systems use at least 128-bit key
^ Longer the key, harder it is to break the cryptosystem
^ Symmetric cryptography rely on a “shared secret” encryption key distributed
^ This key is used by all members to encrypt / decrypt messages
^ Sender & receiver both possess a copy of the shared key
^ Symmetric key cryptography has several weaknesses

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