概念＆ナレッジハブ
Asymmetric RSA Key Pair Generation, Web Crypto & PKCS#8 Architecture
RSA Key Pair Generator creates cryptographically secure public and private key pairs for asymmetric encryption, SSH access, and digital signatures. It utilizes the native browser Web Crypto API (SubtleCrypto) to generate 2048-bit and 4096-bit RSA keys.
Featuring instant PEM formatting (PKCS#8 for private keys, SPKI for public keys) and JWK export, this tool runs 100% in-browser, guaranteeing that your private master encryption keys never touch external servers.
コアアーキテクチャ＆計算式
RSA Algorithm: Public Key (e, n) ; Private Key (d, n) ; Encryption: C = M^e mod n ; Decryption: M = C^d mod n
Generates large probable prime numbers p and q, computes modulus n = p × q, and derives private exponent d using the Extended Euclidean Algorithm.
ベストプラクティスと必須ガイドライン
- Mandate 4096-Bit Key Lengths for Long-Term Cryptographic Security: While 2048-bit RSA keys meet current baseline security standards, NIST guidelines recommend 3072-bit or 4096-bit keys for confidential data requiring protection beyond 2030 against rising computational power.
- Never Share or Expose the Private Key (id_rsa): The public key (SPKI / id_rsa.pub) is designed to be shared openly across servers and clients. The private key (PKCS#8 / id_rsa) must remain strictly confidential; anyone with access to the private key can decrypt all past communications and forge digital signatures.
- Set Restrictive Filesystem Permissions on Exported Private Keys: When saving generated private keys to Unix/Linux environments, immediately restrict file permissions using chmod 600 id_rsa. SSH and OpenSSL clients will reject private keys with permissive file permissions.
- Consider Ed25519 for Modern SSH and Digital Signatures: While RSA remains the universal legacy standard, modern cryptography favors Ed25519 (Edwards-curve Digital Signature Algorithm), which provides equivalent security to a 3072-bit RSA key with dramatically smaller 68-character keys and faster signing.
よくある質問 (FAQ)
How does asymmetric RSA public/private key cryptography work?
RSA is an asymmetric cipher utilizing mathematically paired keys: a Public Key (used by anyone to encrypt messages or verify signatures) and a Private Key (kept secret by the owner to decrypt messages or create signatures). A message encrypted with the public key can only be decrypted by the corresponding private key.
What is the difference between 2048-bit and 4096-bit RSA keys?
The bit length represents the size of the cryptographic modulus n. A 4096-bit key provides exponentially greater security than a 2048-bit key, providing robust resistance against future advances in factorization algorithms, at the cost of slightly slower key generation and encryption compute times. Software engineers recommend testing these transformations thoroughly in staging environments before deploying new data pipelines or schema migrations to production systems.
What are PKCS#8 and SPKI key formats?
PKCS#8 (Public-Key Cryptography Standards #8) is the standard cryptographic format used for storing private key information, identifiable by the header '-----BEGIN PRIVATE KEY-----'. SPKI (Subject Public Key Info) is the corresponding universal standard format used for public keys. Software engineers recommend testing these transformations thoroughly in staging environments before deploying new data pipelines or schema migrations to production systems.
Can GoToolstack or any third party access my newly generated private keys?
No, absolutely not. Key generation executes 100% locally inside your browser sandbox via the browser's native window.crypto.subtle engine. Private keys are generated in volatile device memory and are never transmitted over network sockets, cached in logs, or accessible to external servers. Software engineers recommend testing these transformations thoroughly in staging environments before deploying new data pipelines or schema migrations to production systems.