MrNerdHair

118 reputation

	118 reputation	bio	website		visits	member for	1 year, 7 months
3 badges		location			seen	Apr 14 at 2:05

4 Comments

Jun 18	comment	Is ECB mode secure if plaintexts guaranteed to be unique? There is one other field in the plaintext that stays the same for each record. It's 6 bytes long. If I were to check that field as well as the checksum as part of the authentication procedure, I'd increase my security to 64 bits, wouldn't I? (I realize that's a lot less than 128. Just wondering if I'm thinking clearly here.)
Jun 18	comment	Is ECB mode secure if plaintexts guaranteed to be unique? So what you're saying, if I hear you right, is that I should use a larger checksum? If so, I suppose I'd have to use a checksum as large as the key to provide authentication as strong as the cipher itself, wouldn't I? (Just wondering.)
Jun 18	comment	Is ECB mode secure if plaintexts guaranteed to be unique? You're right about integrity. However, I've made the last 2 bytes of my plaintext a simple checksum over the other 14, and they contain a counter that allows me to tell if they're new or not (sort of like an OTP scheme).
Jun 18	comment	Is ECB mode secure if plaintexts guaranteed to be unique? Thanks. That's what I thought, but in crypto it's always best to assume you're incapable of determining whether or not you're stupid.