[{"data":1,"prerenderedAt":146},["ShallowReactive",2],{"blog-\u002Fblog\u002Ftypes-of-cryptography":3},{"id":4,"title":5,"author":6,"authorTitle":7,"authorUrl":7,"body":8,"canonical":7,"category":87,"date":88,"description":89,"draft":90,"extension":91,"faqs":92,"findingsSource":7,"geo":105,"howto":7,"howtoTitle":7,"image":7,"industries":107,"keyFindings":7,"meta":109,"modified":7,"navigation":110,"path":111,"pullquote":7,"recommendations":7,"references":112,"related":119,"seo":132,"seoTitle":133,"signposts":7,"slug":134,"stats":135,"stem":138,"tags":139,"tldr":144,"__hash__":145},"blog\u002Fblog\u002Ftypes-of-cryptography.md","What Are the Types of Cryptography?","ArcQubit Team",null,{"type":9,"value":10,"toc":77},"minimark",[11,16,29,35,39,44,48,53,57,60,64,67,71],[12,13,15],"h2",{"id":14},"the-answer-up-front","The answer, up front",[17,18,19,20,24,25,28],"p",{},"Modern cryptography has three core types: symmetric-key cryptography, asymmetric-key cryptography, and hash functions. Many sources extend the list to a fourth, hybrid cryptography, which combines the first two. A quantum computer threatens the asymmetric type most, which is why post-quantum cryptography focuses there ",[21,22,23],"span",{},"1",", ",[21,26,27],{},"2",".",[17,30,31],{},[32,33,34],"em",{},"Last verified: Oct. 2, 2026.",[12,36,38],{"id":37},"symmetric-key-cryptography","Symmetric-key cryptography",[17,40,41,42,28],{},"Symmetric-key cryptography uses a single shared key for both encryption and decryption. It is fast and efficient for large volumes of data, and its main challenge is sharing the key securely in the first place. The Advanced Encryption Standard (AES) is the common example. Symmetric algorithms are relatively resilient to quantum attacks: the main effect is that key sizes may need to grow, so AES-256 remains a sound choice ",[21,43,27],{},[12,45,47],{"id":46},"asymmetric-key-cryptography","Asymmetric-key cryptography",[17,49,50,51,28],{},"Asymmetric-key cryptography, also called public-key cryptography, uses a mathematically linked pair of keys: a public key that anyone can use to encrypt or verify, and a private key the owner keeps to decrypt or sign. This removes the need to pre-share a secret and underpins TLS key exchange and digital signatures. RSA and elliptic-curve cryptography (ECC) are the common examples, and this is the type a quantum computer threatens: Shor's algorithm would solve the underlying math efficiently, breaking RSA and ECC ",[21,52,27],{},[12,54,56],{"id":55},"hash-functions","Hash functions",[17,58,59],{},"A hash function converts an input of any size into a fixed-length string, a kind of digital fingerprint, without any key. Hashes are one-way: you cannot reverse them to recover the input. They verify data integrity and store passwords safely. SHA-256 is the common example. Like symmetric cryptography, hash functions are comparatively resilient to quantum attacks.",[12,61,63],{"id":62},"hybrid-cryptography-the-common-fourth","Hybrid cryptography (the common fourth)",[17,65,66],{},"Hybrid cryptography combines the two key-based types. It uses fast symmetric encryption to protect the actual data, and the security of asymmetric encryption to share the symmetric key. This is exactly how secure web browsing works over HTTPS and TLS. Because the asymmetric step is the quantum-vulnerable part, hybrid designs are also where the post-quantum transition shows up first, pairing a classical algorithm with a post-quantum one during migration.",[12,68,70],{"id":69},"where-post-quantum-cryptography-fits","Where post-quantum cryptography fits",[17,72,73,74,76],{},"Post-quantum cryptography does not add a new category. It replaces the vulnerable asymmetric algorithms with new ones designed to resist quantum attacks while still running on classical hardware. NIST finalized the first three in 2024: ML-KEM (FIPS 203) for key establishment, ML-DSA (FIPS 204) for signatures, and SLH-DSA (FIPS 205) as a hash-based signature backup ",[21,75,27],{},". The symmetric and hash types largely stay as they are.",{"title":78,"searchDepth":79,"depth":79,"links":80},"",2,[81,82,83,84,85,86],{"id":14,"depth":79,"text":15},{"id":37,"depth":79,"text":38},{"id":46,"depth":79,"text":47},{"id":55,"depth":79,"text":56},{"id":62,"depth":79,"text":63},{"id":69,"depth":79,"text":70},"Research","2026-10-02","The types of cryptography explained: symmetric-key, asymmetric-key, hash functions, and hybrid, with which ones a quantum computer actually threatens.",false,"md",[93,96,99,102],{"q":94,"a":95},"What are the types of cryptography?","Modern cryptography has three core types: symmetric-key cryptography (one shared key), asymmetric-key cryptography (a public and private key pair), and hash functions (one-way, keyless fingerprints). Many sources add a fourth, hybrid cryptography, which combines symmetric and asymmetric methods [1].",{"q":97,"a":98},"Which type does a quantum computer threaten?","Mainly asymmetric-key cryptography. Shor's algorithm would break RSA and ECC, which protect key exchange and digital signatures. Symmetric cryptography and hash functions are far more resilient and mostly need larger sizes [2].",{"q":100,"a":101},"What is hybrid cryptography?","Hybrid cryptography uses fast symmetric encryption to protect the data and slower asymmetric encryption to securely share the symmetric key. It is how HTTPS\u002FTLS works in practice [1].",{"q":103,"a":104},"How does post-quantum cryptography fit in?","Post-quantum cryptography provides new asymmetric algorithms, standardized by NIST as ML-KEM, ML-DSA, and SLH-DSA, that resist quantum attacks while running on classical hardware [2].",[106],"global",[108],"Cross-Sector",{},true,"\u002Fblog\u002Ftypes-of-cryptography",[113,116],{"label":114,"url":115},"National Institute of Standards and Technology, \"Cryptography,\" NIST Information Technology Laboratory","https:\u002F\u002Fwww.nist.gov\u002Fcryptography",{"label":117,"url":118},"National Institute of Standards and Technology, \"NIST Releases First 3 Finalized Post-Quantum Encryption Standards,\" NIST News, Aug. 13, 2024","https:\u002F\u002Fwww.nist.gov\u002Fnews-events\u002Fnews\u002F2024\u002F08\u002Fnist-releases-first-3-finalized-post-quantum-encryption-standards",[120,123,126,129],{"label":121,"url":122},"Post-Quantum Cryptography Explained","\u002Fblog\u002Fpost-quantum-cryptography-explained",{"label":124,"url":125},"NIST Post-Quantum Standards Guide","\u002Fblog\u002Fnist-pqc-standards-guide",{"label":127,"url":128},"Hybrid vs. Pure Post-Quantum Key Exchange","\u002Fblog\u002Fhybrid-vs-pure-post-quantum",{"label":130,"url":131},"Harvest Now, Decrypt Later","\u002Fblog\u002Fharvest-now-decrypt-later",{"title":5,"description":89},"The Types of Cryptography, Explained","types-of-cryptography",[136,137],"NIST's finalized post-quantum standards, ML-KEM (FIPS 203), ML-DSA (FIPS 204), and SLH-DSA (FIPS 205), replace the asymmetric algorithms a quantum computer threatens (NIST, 2024).","Symmetric algorithms such as AES-256 remain secure against known quantum attacks, needing at most larger key sizes (NIST guidance).","blog\u002Ftypes-of-cryptography",[140,141,142,143],"post-quantum cryptography","quantum risk","quantum-safe algorithms","primer","Modern cryptography has three core types, symmetric-key, asymmetric-key, and hash functions, often extended to a fourth, hybrid cryptography, and quantum computers threaten the asymmetric type most.","okARPBc-tkksK5hRFG9nbpQXkyohLT7xOqSgTkojycE",1792182883700]