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seen Nov 18 at 0:25

Nov
16
awarded  Teacher
Oct
2
awarded  Editor
Oct
2
revised Is deniable error-correction possible?
fixed repeated phrase, but this time correctly
Oct
1
comment Cryptographic data structure: sparse array without membership test
OK, so maybe I'm not seeing the issue here, but it seems to me you could accomplish this pretty trivially. Suppose set(k,v) hashes k (up to 256-bit) into a 512-bit value (to avoid the birthday problem). Then store (hash(k), v) as a key-value pair in an ordered list. Lookup would be O(log(num_k_ever_set)). You could even encrypt v with different hash of k in order to make it indistinguishable as well. Am I missing the core issue here?
Oct
1
suggested suggested edit on Is deniable error-correction possible?
Oct
1
answered Is it feasible to use combination of ABE schemes for encrypting the data?
Jun
19
awarded  Supporter
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
awarded  Student
Jun
18
awarded  Scholar
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
accepted Is ECB mode secure if plaintexts guaranteed to be unique?
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.
Jun
18
answered Is it possible to use the RSA algorithm, or a variant, for software licensing?
Jun
18
asked Is ECB mode secure if plaintexts guaranteed to be unique?