4 ms·
Note that hashquines, i.e., programs that print their own hash when executed do not depend on the hash function being broken. In fact, they are a fun little exe
by hkopp 4y ago
Note that hashquines, i.e., programs that print their own hash when executed do not depend on the hash function being broken. In fact, they are a fun little exercise.
- smegsicle 4y ago#!/bin/sh md5sum $0
- acchow 4y agoI have no idea where to even begin if the digest does not leak something about the data
- adastra22 4y agoAny cryptographic digest is not supposed to leak anything about the data that went in. That’s a core property. In this case the hash doesn’t depend on the data at all. Do you see how that helps?
- 10000truths 4y ago#!/bin/sh HASH=6ce1c11751e405291eac368af96de90f # Increment until hash of this file equals $HASH: 1 echo $HASH
- a1369209993 4y agoThe same way as a normal quine: $ cat >a.py #! /bin/python import hashlib s='#! /bin/python\nimport hashlib\ns=%r\nprint hashlib.sha512(s%%s).hexdigest()\n' print hashlib.sha512(s%s).hexdigest() $ python a.py cf1daf466a7a95b245eab685b808fb861dab9af26078250a8041c4c08a8ff384 (edit: wrap) 7f7d1853f9d62d6b40cc53d0c5be3efd80eb09f57b71250910c0d6157b73fcd3 $ sha512sum a.py cf1daf466a7a95b245eab685b808fb861dab9af26078250a8041c4c08a8ff384 (edit: wrap) 7f7d1853f9d62d6b40cc53d0c5be3efd80eb09f57b71250910c0d6157b73fcd3 a.py
- Doxin 4y agoOh duh. That's a clever trick which is rather obvious in hindsight.