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NTP Authentication

The NTP authentication key doesn't seem to be doing MD5 algorthim as it can be decrytped using password cracker

Is it a bug??????

2 REPLIES
Silver

Re: NTP Authentication

If you are able to crack the password it is a bug.If NTP works fine with MD5 authentication, it should work fine and we should be able to crack the password.

Cisco Employee

Re: NTP Authentication

Actually, the NTP authentication key in the config is done with Cisco's level 7 password cipher, so it is crackable with the IOS password cracker. It is necessary that this key be kept in a reversable form as we will need it to generate a proper MD5 hash on the wire. On the wire, the key will be hashed using he MD5 one way hashing algorithm. While collisions has recently been found in this algorithm, it is not "crackable" per se. By definition, these hashes cannot be reversed.

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