+.PP
+The available bulk-crypto transforms are as follows.
+.TP
+.B v0
+Originally this was the only transform available. It's a standard
+generic composition of a CPA-secure symmetric encryption scheme with a
+MAC; initialization vectors for symmetric encryption are chosen at
+random and included explicitly in the cryptogram.
+.TP
+.B iiv
+A newer `implicit-IV' transform. Rather than having an explicit random
+IV, the IV is computed from the sequence number using a block cipher.
+This has two advantages over the
+.B v0
+transform. Firstly, it adds less overhead to encrypted messages
+(because the IV no longer needs to be sent explicitly). Secondly, and
+more significantly, the transform is entirely deterministic, so (a) it
+doesn't need the (possibly slow) random number generator, and (b) it
+closes a kleptographic channel, over which a compromised implementation
+could leak secret information to a third party.
+.SS "Other key attributes"
+The following attributes can also be set on keys.
+.TP
+.B serialization
+Selects group-element serialization formats.
+The recommended setting is
+.BR constlen ,
+which selects a constant-length encoding when hashing group elements.
+The default,
+for backwards compatibility, is
+.BR v0 ;
+but this is deprecated.
+(The old format uses a variable length format for hashing,
+which can leak information through timing.)