What is decryption? Meaning, keys and examples
Decryption turns ciphertext back into readable data with the right key. A worked AES-GCM example, the kinds of keys involved, and why attackers target the moment of decryption.
#cryptography
11 articles tagged #cryptography
Articles
What is encryption? A plain-English guide
Encryption protects your UPI payments, WhatsApp chats and course videos. Here's how it works, what keys do, and what encryption can and can't protect.
Symmetric vs asymmetric encryption: what's the difference?
One shared key, or a public and private pair? How the two families of encryption work, what each is good at, and why the internet relies on both at once.
AES-256, explained simply
What AES-256 is, what the 256 means, what happens inside the cipher, and why real-world failures come from key handling rather than the algorithm.
ECC encryption vs RSA: elliptic curves explained
Why elliptic curves match RSA with far smaller keys: ECDH, ECDSA and Ed25519, choosing P-256 or X25519, measured speeds side by side, and the quantum risk.
RSA encryption explained: how it works, with an example
How RSA works, with a small-number example you can check by hand: encryption vs signing, key sizes and speed, RSA vs AES, and what quantum computers mean for it.
Block cipher vs stream cipher: differences and examples
AES vs ChaCha20 in practice: how block and stream ciphers process data, why CTR and GCM modes blur the line, which is faster on phones, and the nonce-reuse trap.
Types of encryption: algorithms and where each is used
Symmetric, asymmetric, key exchange and hashes: a map of AES, ChaCha20, RSA, ECC and more, which algorithms to retire, and where each one protects a video lesson.
Is AES-128 still secure? Key size vs key handling
Yes, with caveats that have nothing to do with key length: the brute-force maths, what quantum computing changes, GCM and CBC pitfalls, and AES-128 in HLS video.
Diffie-Hellman key exchange, explained simply
How two devices agree on a secret key in public: the colour-mixing analogy, a small-number worked example, forward secrecy, man-in-the-middle attacks and post-quantum hybrids.
How digital signatures work, step by step
Hash, sign with a private key, verify with a public key: what digital signatures prove, where you meet them every day, and how India's DSCs and eSign work.
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