Comparison of cryptographic strength

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Approximate comparable key sizes for symmetric- and asymmetric-key cryptosystems based on the best-known algorithms for attacking them.

Symmetric

Elliptic

RSA

80

163

1024

96

193

1536

112

233

2048

128

283

3072

192

409

7680

256

571

15360

 

 

 

 

 

Similar kind of table can be found e.g. in the publication SP800-57 “Recommendation on Key Management, August 2005” of the National Institute of Standards and Technology (NIST) of USA.

Additional reading:

Standards for Efficient Cryptography (SEC): SEC 1: Elliptic Curve Cryptography and SEC 2: Recommended Elliptic Curve Domain Parameters from www.secg.org.

Literature:

A. Lenstra, E.Verheul, "Selecting Cryptographic Key Sizes", Journal of Cryptology 14 (2001) 255-293

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