def attemptCrack(self, ctext: str) -> List[CrackResult]:
logger.debug(f"Trying ASCII shift cipher on {ctext}")
logger.trace("Beginning cipheycore simple analysis")
# Hand it off to the core
analysis = self.cache.get_or_update(
ctext,
"cipheycore::simple_analysis",
lambda: cipheycore.analyse_string(ctext),
)
logger.trace("Beginning cipheycore::caesar")
possible_keys = cipheycore.caesar_crack(analysis, self.expected,
self.group, self.p_value)
n_candidates = len(possible_keys)
logger.debug(f"ASCII shift returned {n_candidates} candidates")
if n_candidates == 0:
logger.trace("Filtering for better results")
analysis = cipheycore.analyse_string(ctext, self.group)
possible_keys = cipheycore.caesar_crack(analysis, self.expected,
self.group, self.p_value)
candidates = []
for candidate in possible_keys:
logger.trace(
f"Candidate {candidate.key} has prob {candidate.p_value}")
translated = cipheycore.caesar_decrypt(ctext, candidate.key,
self.group)
candidates.append(
CrackResult(value=translated, key_info=candidate.key))
return candidates
def attemptCrack(self, ctext: str) -> List[CrackResult]:
logger.debug("Trying caesar cipher")
# Convert it to lower case
#
# TODO: handle different alphabets
if self.lower:
message = ctext.lower()
else:
message = ctext
logger.trace("Beginning cipheycore simple analysis")
# Hand it off to the core
analysis = self.cache.get_or_update(
ctext,
"cipheycore::simple_analysis",
lambda: cipheycore.analyse_string(message),
)
logger.trace("Beginning cipheycore::caesar")
possible_keys = cipheycore.caesar_crack(analysis, self.expected,
self.group, True, self.p_value)
n_candidates = len(possible_keys)
logger.debug(f"Caesar returned {n_candidates} candidates")
candidates = []
for candidate in possible_keys:
translated = cipheycore.caesar_decrypt(message, candidate.key,
self.group)
candidates.append(
CrackResult(value=translated, key_info=candidate.key))
return candidates
def decrypt(self, message):
logger.debug("Trying caesar Cipher")
# Convert it to lower case
#
# TODO: handle different alphabets
message = message.lower()
# Hand it off to the core
group = cipheydists.get_charset("english")["lcase"]
expected = cipheydists.get_dist("lcase")
analysis = cipheycore.analyse_string(message)
possible_keys = cipheycore.caesar_crack(analysis, expected, group)
n_candidates = len(possible_keys)
logger.debug(f"Caesar cipher core heuristic returned {n_candidates} candidates")
for candidate in possible_keys:
translated = cipheycore.caesar_decrypt(message, candidate.key, group)
result = self.lc.checkLanguage(translated)
if result:
logger.debug(f"Caesar cipher returns true {result}")
return {
"lc": self.lc,
"IsPlaintext?": True,
"Plaintext": translated,
"Cipher": "Caesar",
"Extra Information": f"The rotation used is {candidate.key}",
}
# if none of them match English, return false!
logger.debug(f"Caesar cipher returns false")
return {
"lc": self.lc,
"IsPlaintext?": False,
"Plaintext": None,
"Cipher": "Caesar",
"Extra Information": None,
}