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 Feb1 comment Is it ok to send part of digital signature if we have bandwidth constraints? @RickyDemer Can I do something like take hash, take part of it, encrypt it and send to the receiver and receiver can verify it. Jan31 comment Is it ok to send part of digital signature if we have bandwidth constraints? @RickyDemer Whether something like create a hash take a small part and sign it and send. The verifier can decrypt it and Jan31 comment Is it ok to send part of digital signature if we have bandwidth constraints? @RickyDemer Why MAC is preferred? Since we can have public/private key work in this case. Jan31 comment Is it ok to send part of digital signature if we have bandwidth constraints? Recreate the signature and check whether the part is equal. Jan31 comment How to specify last $t$ bits are only sent when a signature is sent? @CodesInChaos Is it possible to send only a part of signature? Like 16 bits? Jan2 comment How can I solve congruence modulo N? Yes. It was my mistake Jan1 comment How can I solve congruence modulo N? Values of $J_A$ and $e$ are known. I am using example from GQ signature scheme from the book Page 451 cacr.uwaterloo.ca/hac/about/chap11.pdf Dec28 comment How to select parameters based on some condition Random is the accepted method? Whether RSA uses random method? Dec27 comment Shadowed identity in cryptography Using the same example from the text, when I took $modularpow(J,phi−s,n)$, I am getting the value as -126739. I have J=34579, phi= 419184, s=233875 and n=420491 Dec27 comment Shadowed identity in cryptography One last question. There is an equation in the text "$s_A=(J_A)^{−s}mod\ n$". How could I calculate that? Taking $(J_A)^{−s}$ and taking mod n? Dec26 comment Shadowed identity in cryptography What is the recommended method for calculating shadow? Dec17 comment Authentication mechanism for low memory, low computing power device @skillzeo I cant use this since it require computation at both parties and have to send messages between them many times Feb4 comment Why RSA encryption key is based on modulo $\varphi(n)$ rather than modulo $n$ Why there is no congruence? Nov9 comment How key materials are generated in SSL V3 from master secret The TLS 1.0 documentation says The cipher spec which is defined in this document which requires the most material is 3DES_EDE_CBC_SHA: it requires 2 x 24 byte keys, 2 x 20 byte MAC secrets, and 2 x 8 byte IVs, for a total of 104 bytes of key material. How they arrived at the key size of 24 byte for 3DES. A little search on net gives 3DES key size as 168, 112 or 56 bits  Nov7 comment What is the purpose of four different secrets shared by client and server in SSL/TLS? why we have server_write_key and client_write_key? Sep8 comment Basic explanation of Elliptic Curve Cryptography? @D.W. I have a basic understanding of Cryptography being a compsci undergrad. Don't know much about the underlying theoretical buildup. I want to know more from a practical view. A simplified theoretical view is highly desirable, since most text books look this from a high level view. Sep8 comment Basic explanation of Elliptic Curve Cryptography? @mikeazo I have both William Stallings and Bruce Schneier book.