David Schwartz

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2,667 reputation
413
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location Murphys, CA
age 43
visits member for 1 year, 10 months
seen Jun 14 at 9:37
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I am OpenCoin's Chief Cryptographer and one of the architects of the Ripple payment system.

I live in California's Gold Country, east of Sacramento.

Bitcoin: 1Gonhezk1ScHaFqUSYH9VQThaDS4PJSq1o


56 Answers

newest activity votes
35
Is modern encryption needlessly complicated?
sep 2 '11 at 6:25
25
Is Convergent Encryption really secure?
sep 20 '11 at 9:01
17
Why programming languages don't provide simple encryption methods?
jan 3 '12 at 7:46
13
Could one prevent double spending in decentralized digital currencies (like Bitcoin) without all transactions being public?
aug 25 '11 at 17:02
9
Would it be secure to use random numbers from random.org in a cryptographic solution?
jan 10 '12 at 22:46
9
How to require two keyholders to decrypt a document?
oct 24 '11 at 18:09
7
Cryptographic GUID?
aug 9 at 23:51
6
finding collision for truncated SHA1 hash output
nov 6 at 15:00
6
Two mutually untrusted parties want to exchange data: how to ensure each one gets the data it needs?
jan 12 '12 at 5:29
6
Is there a secret sharing scheme which allows sharing of a secret (one-out-of-n)
nov 1 '11 at 18:23
5
Encryption scheme for social-network-like data sharing data via untrusted server?
sep 30 '11 at 14:33
5
How secure is the Bitcoin protocol?
aug 24 '11 at 9:02
4
How can one sign with NTRU?
apr 18 '12 at 21:34
4
How is de-synchronisation of HOTP solved?
dec 17 '11 at 20:05
4
Why does PBKDF2 xor the iterations of the hash function together?
aug 14 '11 at 18:19
3
Why do we assume un-security of communication channel on every cryptography system
feb 21 at 4:14
3
What does a “cycle” mean in cryptography benchmarks?
jan 15 at 13:57
3
Is it possible to ensure security with zero pre-shared information?
jul 16 '12 at 8:33
3
What differentiates a password hash from a cryptographic hash besides speed?
jul 11 '12 at 6:08
3
How can I validate a hashed password if all I have is another hash?
jun 27 '12 at 20:44
3
How can I create a fixed length output in my hash function?
nov 23 '11 at 18:32
3
How does one scale encryption strength upwards from 256-bit?
sep 30 '11 at 10:16
3
Hashing or encrypting twice to increase security?
sep 25 '11 at 12:15
3
How does asymmetric encryption work?
aug 26 '11 at 10:15
3
How can SSL secure a two-way communication with only one key-pair?
aug 14 '11 at 21:00
2
How can a key pair be derived from an arbitrary hash?
apr 27 at 8:22
2
Is signing a hash instead of the full data considered secure?
feb 13 at 5:12
2
Storage of Private Keys
aug 27 at 5:25
2
What is the effect of the different AES key lengths?
aug 23 at 16:11
2
My custom handshake
apr 7 '12 at 13:13
1 2