It's getting better and better. Not only do I have some very nice and secure sign+crypt functionality in PCP, but public key export and import from pcp to pbp and vice versa works now finally. From pbp issue#10:

PBP => PCP:

$ pbp -b . -x --self Tom > tom.pbp 
Passphrase for decrypting master key for Tom: 
$ pcp1 -V vx -P -I tom.pbp -b
key 0x61E05C2AA4803742 added to vx.
$ pcp1 -V vx -l           

Key ID               Type      Creation Time        Owner
0x61E05C2AA4803742    public   2014-02-06T07:31:00  Tom <>

PCP => PBP:

$ pcp1 -V va -b -p -O alice.pbp   
Enter passphrase to decrypt your secret key for signing the export: 
public key exported in PBP format.
$ pbp -b . -X -i alice.pbp
Success: imported public keys for Alice
$ pbp -b .  -l
invalid 9163 3781 9b14 ea5b 010b 7487 61fd dd46 Alice
valid 9275 5a5d 5375 bb49 d096 e0c5 1261 a575 Bob

Pure happyness!

One drawback does it have though: public key crypto doesn't work yet. I suspect the recipient list computing is incompatible since symetric crypto already works. At least pcp says that it cannot find a matching public key. And the other direction doesn't work too. But that's the smallest of all possible problems.

Update 2014-02-06:

# bob exports his pk
bobby@io: % pbp -x --self Bob > bob.pbp
Passphrase for decrypting master key for Bob: 
alice exports her pk
alicia@io: % pcp -p -b -O alice.pbp
Enter passphrase to decrypt your secret key for signing the export:
public key exported in PBP format.
bob imports alice’ pk
bobby@io: % pbp -X -i alice.pbp
Success: imported public keys for Alicia
bobby@io: % pbp -l
valid b888 026a 38e2 cdf7 f0a6 6486 63a5 0fea Bob
invalid ed32 1935 0310 fe6f 35c6 b44d be6b 3ca8 Alicia   [1]
alice imports bobs pk
alicia@io: % pcp -P -I bob.pbp -b
key 0x87358A0988953A67 added to ~/.pcpvault.
alicia@io: % pcp -l
Key ID               Type      Creation Time        Owner
0xB497AFF45654CD98   primary   2014-02-06T19:58:09  Alicia <>
0x87358A0988953A67    public   2014-02-06T18:58:02  bob <>
bob encrypts to alice
bobby@io: % echo “HALLO ALICE, KNUTSCHI” > msg
bobby@io: % pbp -c -i msg -o encrypted -r Alicia -S Bob
Passphrase for decrypting encryption subkey for Bob:
alice decrypts it
alicia@io: % pcp -d -I encrypted
Enter passphrase to decrypt your secret key:
HALLO ALICE, KNUTSCHI
Decrypted 22 bytes successfully
other way around, alice encrypts to bob
alicia@io: % echo “ACH, SCHNUCKI” | pcp -e -O encrypted -r Bob
Enter passphrase to decrypt your secret key:
Encrypted 164 bytes for:
bob <>
and bob decrypts it
bobby@io: % pbp -d -i encrypted -S Bob
Passphrase for decrypting encryption subkey for Bob:
ACH, SCHNUCKI
good message from Alicia