Choosing a blockchain system design may be guided by crypto library and encryption technology as well. An organization's use case requirements will dictate this choice and drive technology investments in blockchain application infrastructure:

• Asymmetric: RSA (1024-8192), DSA (1024-3072), Diffie-Hellman, KCDSA, Elliptic Curve Cryptography (ECDSA, ECDH, ECIES) with named, user-defined, and brainpool curves
• Symmetric: AES, RC2, RC4, RC5, CAST, DES, Triple DES, ARIA, SEED
• Hash/message digest/HMAC: SHA-1, SHA-2 (224-512), SSL3-MD5-MAC, SSL3-SHA-1-MAC, SM3
• Random number generation: FIPS 140-2 approved DRBG (SP 800-90 CTR mode)