What is Symmetric vs. Asymmetric Encryption?
The core dichotomy in cryptography comparing single shared-secret algorithms (AES-GCM, ChaCha20) against public/private key-pair algorithms (RSA, ECC, X25519).
Symmetric Ciphers: Shared Secret Speed
Symmetric encryption uses the exact same secret key for both encryption and decryption. Algorithms like AES-256-GCM deliver blazing throughput (gigabytes per second via hardware CPU AES-NI instructions), making them ideal for bulk document encryption.
Because the key must remain confidential between parties, symmetric encryption requires a secure channel for initial key distribution.
Asymmetric Ciphers: Public-Key Distribution
Asymmetric encryption utilizes mathematically linked key pairs: a public key that anyone can use to encrypt messages, and a private key kept strictly confidential for decryption.
Modern secure protocols (like TLS 1.3 and PGP) combine both into hybrid cryptosystems: asymmetric key exchange (ECDH) securely negotiates an ephemeral session key, which AES-256 then uses to encrypt payload streams.
Key Advantages & Impact
- Symmetric encryption processes multi-gigabyte files with negligible CPU overhead
- Asymmetric encryption solves the fundamental challenge of sharing keys over insecure networks
- Authenticated encryption (AEAD) provides both confidentiality and tamper-proof integrity tags
Common Misconceptions vs Reality
Experience This Technology in DocSwift Tools
Frequently Asked Questions
Which encryption does DocSwift use for password-protecting PDFs?
DocSwift uses authenticated AES-256 encryption with PBKDF2 key derivation, running 100% locally in your browser memory via the native Web Crypto API.