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12h
reviewed Close Software applications to learn cryptography
12h
reviewed Close How the couples of int (n,e) and (n,d) are converted into char for RSA public and private keys?
12h
reviewed Reject El Gamal Decryption with Big Numbers
12h
reviewed Leave Closed El Gamal Decryption with Big Numbers
1d
answered Asymmetric cipher with multiple public keys
1d
answered Password length versus hash length?
1d
reviewed Leave Open How to decrypt a '.enc' file that has been encrypted with RSA using a public key?
2d
reviewed Leave Open Why cant I use ECB with some obfuscation for random access data stored in say a DDR
Apr
24
comment Asymmetric cipher with multiple public keys
Why can't all the verifiers receive the same public key? Do you need it to be difficult to tell whether two public keys correspond to the same private key? It would seem that being able to verify the same message would give it away. If you sign a message and then generate more public keys, do the new public keys need to be able to verify the signature?
Apr
24
revised Asymmetric cipher with multiple public keys
added 34 characters in body; edited tags; edited title
Apr
23
reviewed Approve Why use randomness in digital signature algorithms?
Apr
21
comment suitable method for encryption and decryption
That's still not nearly clear enough. Who would supply the encryption key? Do the program and the database live in different security domains? What kind of attacks do you want to protect against?
Apr
20
comment Multiple AES/ECB encryptions of different data with same key all end with same pattern
Your question is incomprehensible. You should give an example with some sample plaintexts and the corresponding ciphertexts, and explain exactly how they're computed (like you did in your comment, but it's unreadable due to the lack of formatting: edit your question). Also tell us how you're generating the IV.
Apr
20
reviewed Leave Closed Multiple AES/ECB encryptions of different data with same key all end with same pattern
Apr
18
comment suitable method for encryption and decryption
Your problem is not a problem with cryptography, it is a problem with security design. The encryption scheme is not what you should be worrying about. What you need first is some clear requirements — which attacks (more precisely which threats) you're concerned with and what functionality (who can access what, what information is stored where) you need.
Apr
18
revised Why does applying 56-bit DES twice only give 57 bits of security?
smaller value of 5
Apr
18
comment Why is plain ElGamal not secure?
en.wikipedia.org/wiki/ElGamal_encryption#Security
Apr
18
reviewed Looks OK Why is plain ElGamal not secure?
Apr
18
reviewed Close What are application of Cryptography in Algebraic Topology
Apr
17
reviewed Edit What does L_n is the bit length of the group order n states need for my calculation in ECDSA algorithm?