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Lesson 1 · Cinematic Video
Symmetric Encryption
IT Security — Defense Against the Digital Dark Arts · Cryptography
Overview
Aaj Hum Kya Seekhenge?
Is lesson me hum Symmetric Encryption ke baare me detail se seekhenge. Topics include: Ek key se…
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IT Support
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IT Security — Defense Against the Digital Dark Arts
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~25 min
Learning Goals
Seekhne Ka Maqsad
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Ek key se lock aur unlock. Tum seekhoge:…
Topic 1
Ek key se lock aur unlock. Tum seekhoge: Cryptography basics: Encryption: plaintext → ciphertext (unreadable); Decryption: ciphertext → plaintext; Cipher: algorithm used for encryption/decryption; Key: secret value used with cipher; key length affects security (longer = more secure); Symmetric encryption kya hai: same key for encryption AND decryption; fast performance; problem: key distribution (how to safely share the key?); Algorithms: DES (Data Encryption Standard): 1977; 56-bit key; BROKEN
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too short, brute-forceable — yeh…
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historical significance — yeh…
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3DES (Triple DES): DES applied 3…
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168-bit effective — yeh aspect Ek…
Key Takeaways
Aaj Kya Seekha?
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Ek key se lock aur unlock. Tum…
Quick Quiz
Quiz — Question 1
Symmetric Encryption me Ek key se lock aur unlock. Tum seekhoge: Cryptography basics: Encryption: plaintext →…