and convenience. See \k{pageant} for further details.
There is more than one \i{public-key algorithm} available. The most
-common is \i{RSA}, but others exist, notably \i{DSA} (otherwise known as
-DSS), the USA's federal Digital Signature Standard. The key types
-supported by PuTTY are described in \k{puttygen-keytype}.
+common are \i{RSA} and \i{ECDSA}, but others exist, notably \i{DSA}
+(otherwise known as DSS), the USA's federal Digital Signature Standard.
+The key types supported by PuTTY are described in \k{puttygen-keytype}.
\H{pubkey-puttygen} Using \i{PuTTYgen}, the PuTTY key generator
PuTTYgen is a key generator. It \I{generating keys}generates pairs of
public and private keys to be used with PuTTY, PSCP, and Plink, as well
as the PuTTY authentication agent, Pageant (see \k{pageant}). PuTTYgen
-generates RSA and DSA keys.
+generates RSA, DSA, and ECDSA keys.
When you run PuTTYgen you will see a window where you have two
choices: \q{Generate}, to generate a new public/private key pair, or
\b A \i{DSA} key for use with the SSH-2 protocol.
+\b An \i{ECDSA} (\i{elliptic curve} DSA) key for use with the
+SSH-2 protocol.
+
The SSH-1 protocol only supports RSA keys; if you will be connecting
using the SSH-1 protocol, you must select the first key type or your
key will be completely useless.
-The SSH-2 protocol supports more than one key type. The two types
-supported by PuTTY are RSA and DSA.
+The SSH-2 protocol supports more than one key type. The types
+supported by PuTTY are RSA, DSA, and ECDSA.
-The PuTTY developers \e{strongly} recommend you use RSA.
+The PuTTY developers \e{strongly} recommend you use RSA. \#{FIXME: ECDSA!}
\I{security risk}\i{DSA} has an intrinsic weakness which makes it very
easy to create a signature which contains enough information to give
away the \e{private} key!
The \q{Number of bits} input box allows you to choose the strength
of the key PuTTYgen will generate.
-Currently 1024 bits should be sufficient for most purposes.
+For RSA, 2048 bits should currently be sufficient for most purposes.
+\#{FIXME: DSA}
+For ECDSA, only 256, 384, and 521 bits are supported. (ECDSA offers
+equivalent security to RSA with smaller key sizes.)
\S{puttygen-generate} The \q{Generate} button