The post-quantum cryptography tool.
This is a GnuPG-like unix program for encryption and signing that uses only quantum-computer-resistant algorithms:
McEliece cryptosystem (compact quasi-dyadic variant) for encryption
Hash-based Merkle tree algorithm (FMTSeq variant) for digital signatures

Why this?
Go read

package downloads:

There is a complete, UNIXy manual page supplied with the package. You can view it online here:

Quick How-To
Everything is meant to work mostly like GnuPG, but with some good simplicity margin. Let's play with random data!

ccr -g help
ccr -g fmtseq128-sha --name "John Doe" # your signature key
ccr -g mceqd128 --name "John Doe" # your encryption key

ccr -K #watch the generated keys
ccr -k

ccr -p -a -o my_pubkeys.asc -F Doe # export your pubkeys for friends

#see what people sent us
ccr -ina < friends_pubkeys.asc

#import Frank's key and rename it
ccr -ia -R friends_pubkeys.asc --name "Friendly Frank"

#send a nice message to Frank (you can also specify him by @12345 keyid)
ccr -se -r Frank < Document.doc > Message_to_frank.ccr

#receive a reply
ccr -dv -o Decrypted_verified_reply.doc