algorithm - How do RSA tokens work? - Stack Overflow
2011年12月1日 · The RSA SecurID authentication mechanism consists of a "token" — either hardware (e.g. a USB dongle) or software (a soft token) — which is assigned to a computer user and which generates an authentication code at fixed intervals (usually 60 seconds) using a built-in clock and the card's factory-encoded random key (known as the "seed".
authentication - How do rsa key fobs work? - Stack Overflow
2009年2月4日 · The fob has a clock and a serial number that is used as a seed for a PRNG. When you hit the "show me a code" button, the fob displays a number that is the product of that timestamp and the serial number run through the PRNG. The server knows your fob's serial number and time, and does the same operation. If your codes match, you're authenticated.
How does the RSA private key passphrase work under the hood?
2009年11月21日 · The passphrase is just a key used to encrypt the file that contains the RSA key, using a symmetric cipher (usually DES or 3DES). In order to use the key for public-key encryption, you first need to decrypt its file using the decryption key. ssh does this automatically by asking your for the passphrase. If somebody got a hold of the key's file ...
How does RSA work while encrypting a sentence? - Stack Overflow
2019年8月15日 · RSA - the cryptographic primitive - operates on numbers. RSA as defined in PKCS#1, where the modular exponentiation is preceded or followed by padding / unpadding however operates on bits. In turn, cryptographic libraries operate on bytes, as a byte is generally the smallest element that can be addressed directly within memory.
rsa - What is the difference between encrypting and signing in ...
2015年11月15日 · RSA decryption is the RSA signature. No, it is not! The confusion comes from the textbook RSA. the textbook RSA encryption; message m and calculates c = m^e mod n for encryption and m = c^d mod n for the decryption. the textbook RSA signatures; message m and calculates sg = m^d mod n for verification and m == sg^e mod n for the signature ...
hash - How Do Hardware Token Devices work? - Stack Overflow
The RSA SecurID authentication mechanism consists of a "token" — either hardware (e.g. a USB dongle) or software (a soft token) — which is assigned to a computer user and which generates an authentication code at fixed intervals (usually 60 seconds) using a built-in clock and the card's factory-encoded random key (known as the "seed").
how does RSA distribute keys to the sender and receiver?
2012年11月20日 · This is the fundamental problem of cryptography that RSA and other public-key cryptosystem tries to solve. In RSA, the receiver generates a public key (N, e) and a private key d using two very large primes, so large that their product is very difficult to factor. (You can refer to the details of key generation here) The key difference of RSA ...
Adding a public key to ~/.ssh/authorized_keys does not log me in ...
If you didn't create a default key, this is the first step to go wrong ... you should use: ssh-copy-id -i path/to/key_name.pub user_name@host_name. 3. Logging ssh user_name@host_name will work only for the default id_rsa file, so here is the second trap. You need to do ssh -i path/to/key_name user@host.
Does RSA encrypt each character in a message separately?
1. RSA encrypts the whole message by converting the whole text into a very large integer usually by putting an integer representation of each character in the text side by side and then applying the public key. If each character is encrypted separately, the encrypted message will be vulnerable to frequency analysis. answered Mar 13, 2019 at 12:47.
Does RSA encrpytion work for small numbers? - Stack Overflow
2012年11月16日 · He first turns M into an integer m, such that 0 <= m < n by using an agreed-upon reversible protocol known as a padding scheme. He then computes the ciphertext c corresponding to. c = m^e (mod n) Your m (123) is not less than n (33), so it doesn't work. So yes, you would need to start with larger p and q to get a larger n.