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Security Level Reference
- 80 bits — legacy, not recommended for new systems
- 112 bits — NIST minimum for data protected through 2030
- 128 bits — recommended for most applications, secure through 2030+
- 192 bits — high security for long-lived sensitive data
- 256 bits — maximum practical security, quantum-resistant for symmetric algorithms
The Encryption Strength Calculator on TechConverter.me helps you make informed decisions about algorithm and key length selection, with NIST recommendations, post-quantum analysis, and practical performance guidance for every major encryption algorithm.
Examples
Example 1: Comparing RSA Key Lengths
A developer is choosing an RSA key length for a new TLS certificate. The calculator shows the security equivalence:
- RSA-1024: ~80 bits of security — below NIST minimum, not recommended for new systems
- RSA-2048: ~112 bits of security — meets NIST recommendation through 2030
- RSA-3072: ~128 bits of security — recommended for data protected beyond 2030
- RSA-4096: ~140 bits of security — high security margin, slower performance
For a certificate that needs to remain valid for 5+ years, the calculator recommends RSA-3072 or higher to ensure the key remains secure for the full validity period.
Example 2: AES Key Length Selection
For symmetric encryption, the calculator shows the security strength and estimated brute-force times:
AES-128:
Security bits: 128
Brute-force with current hardware: 2^128 operations ≈ 3.4 × 10^38 years
Post-quantum security: 64 bits (Grover's algorithm halves symmetric security)
NIST recommendation: approved through 2030+
AES-192:
Security bits: 192
Post-quantum security: 96 bits
NIST recommendation: approved through 2030+
AES-256:
Security bits: 256
Post-quantum security: 128 bits (quantum-resistant)
NIST recommendation: approved through 2030+ and post-quantum era
For most applications, AES-128 is sufficient. For data that must remain secure in a post-quantum world, AES-256 is recommended.
Example 3: RSA vs ECC Equivalence
The calculator shows why ECC is preferred for new systems — smaller keys provide equivalent security:
- ECC P-256 (256-bit) ≈ RSA-3072 (3072-bit) — both provide ~128 bits of security
- ECC P-384 (384-bit) ≈ RSA-7680 (7680-bit) — both provide ~192 bits of security
- ECC P-521 (521-bit) ≈ RSA-15360 (15360-bit) — both provide ~260 bits of security
ECC P-256 keys are 12x smaller than equivalent RSA-3072 keys, resulting in faster key generation, smaller TLS handshakes, and lower CPU usage — with the same security level.