The discussion here is exclusively about RSA key pairs, although the concepts are similar for other algorithms (although key lengths are not equivalent) The case for using 2048 bits instead of 4096 bits This has lead to some confusion as people try to make decisions about which smartcards to use or which type of CA certificate to use. The next most fashionable number after 1024 appears to be 2048, but a lot of people have also been skipping that and moving to 4096 bit keys. Most people have heard that 1024 bit RSA keys have been cracked and are not used any more for web sites or PGP. One of the core decisions in this field is the key size. This is sometimes referred to as certificate authentication, but certificates are just one of many ways to use public key technology. One of the issues that comes up is the need for stronger encryption, using public key cryptography instead of just passwords. Many people are taking a fresh look at IT security strategies in the wake of the NSA revelations. Looking for ZRTP, TLS and 4096 bit RSA in a 100% free and open-source Android app? Lumicall
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