.BR blowfish-cbc .
This is the default transform.
.TP
+.B aead
+Use an `authenticated encryption with additional data' (AEAD) scheme.
+The specific scheme is named by the
+.B cipher
+attribute. Run
+.B catcrypt show aead
+for a list of supported AEAD schemes; the default is
+.BR chacha20-poly1305 .
+.TP
.B naclbox
Use Salsa20 or ChaCha and Poly1305 to secure the bulk data.
This is nearly the same as the NaCl
.BR chacha8 ;
the default is
.BR salsa20 .
+Nowadays, this is equivalent to the
+.B aead
+transform, using
+.IB cipher -naclbox
+as the cipher.
.PP
As well as the KEM itself, a number of supporting algorithms are used.
These are taken from appropriately named attributes on the key or,